EASA Module 6 : Material & Hardware Question
EASA Module 6 : Material & Hardware Question-Answer
What is a fusible material?
a) The ability of two dissimilar metals to melt together
Ans b) The ability of a metal to melt
c) The ability of a metal to be welded
9 x 16 cable is
Ans a) 9 cables of 16 strands
b) 9 cables having 16 turns per inch
c) cable size 9/16 inch diameter
Turn buckle lock nut is a
Ans a) stiff nut
b) slotted nut
c) castle nut
An AN steel bolt is identified by
Ans a) X on head
b) - on head
c) plain bolt
Normalizing of steel is done to
Ans a) remove residual stress of the manufacturing process
b) make steel softer
c) restore the fatigue life of steel
Needle bearings resist
a) radial and axial load
Ans b) radial load only
c) axial load only
Turnbuckles are used to
Ans a) adjust minor tension on the cable
b) join the two ends of the cable
c) adjust major tension on the cable
Rivnuts were originally used for
Ans a) securing rubber deicing boots
b) securing structural parts
c) securing cabin floorings
The drill bit to be used for stainless steel should have included angle of
a) 90 degrees
Ans b)140 degrees
c) 118 degrees
Brittleness is
a) the property to get deform before cracking
b)the property to resist wear
Ans c) the property to resist deformation
The angle of a screw thread is
Ans a) the inclusive angle of the thread sides
b)half the inclusive angle of the thread sides
c) the distance the thread moves in one turn
A turnbuckle is in safety when
a) the colour on the threads is showing
Ans b)the witness hole is covered or the amount of threads showing at
the cable end is in accordance with the Maintenance Manual
c) it is lockwired
A turnbuckle can be safetied by
a) teflon lock nuts
b)doesn't require to be safety locked
Ans c) by lock nuts and safety wirelocking
What is an advantage of a double flare on aluminium tubing?
a) It is less resistant to the shearing effect of torque
Ans b)It is more resistant to the shearing effect of torque
c) Ease of construction
What type loads cause the most rivet failures?
Ans a) Head
b)Shear
c) Bearing
Which part of the 2017-T36 aluminium alloy designation indicates the primary alloying agent used in its manufacture?
a) 17
Ans b)2
c) 20
Clad aluminium alloys are used in aircraft because they
a) can be heat treated much easier than the other forms of aluminium
b)are stronger than unclad aluminium alloys
Ans c) are less subject to corrosion than uncoated aluminium alloys
Non heat treatable aluminium alloys
a) cannot be softened
b)cannot be hardened
Ans c) can be hardened by strain hardening
Galvanic corrosion is caused by
Ans a) the joining of 2 dissimilar metals
b)cyclic stressing and a decrease in cross sectional area
c) incorrect heat treatments or incorrect alloying
In the galvanic series, the most noble metal will, if joined to
another metal
a) corrode before the less noble metal
Ans b)allow the less noble metal to corrode first
c) always be at the top of the table
Stress corrosion is associated with
Ans a) cyclic loading and a corrosion pit
b)a corrosion pit in a member under a compressive load
c) a corrosion pit in a member under stress
Intercrystalline corrosion
Ans a) always appears as small surface cracks
b)is detectable by X-rays
c) is the same as exfoliation corrosion
The usual manufacturers anti-corrosion process to be applied to Fe aircraft parts is
a) anodising
Ans b)cadmium plating
c) metal spraying
Chromate treatment is applied to
Ans a) magnesium alloys
b)Al alloys
c) Fe alloys
A spring washer
a) must not be used more than once
b)may be used a second time provided it is fitted the reverse way round
Ans c) maybe used more than once provided it continues to provide an efficient lock
If the cross sectional area of a cable is increased, what will happen
to the voltage drop?
a) Increase
Ans b)Decrease
c) Stay the same
Spring locking clips for turnbuckles can be used on
a) all flying control cables
Ans b)no flying control cables
c) only on trim control cables
The cross sectional area of a copper crimp barrel is
a) same as an aluminium one
b)larger than an aluminium one
Ans c) smaller than an aluminium one
What is the small hole on a swaged turnbuckle for?
Ans a) To check if correct amount of cable has been inserted before swaging
b)To check for moisture deposits
c) To alloy the turnbuckle to be wire locked
Electrical cable on aircraft is mainly made from copper because
Ans a) it offers low resistance to current flow
b)it more malleable
c) it does not oxidise
Fork end fittings on control rod ends should have
Ans a) bolt heads fitted upwards
b)0.002 inch axial movement
c) anti vibration compound
Rivets main strength quality is to resist
a) tensile loads
b)torsion
Ans c) shear loads
Non heat treatable aluminium alloys
a) can not be softened
b)cannot be hardened
Ans c) can be hardened by strain hardening
Advantages of electric arc steel making are
Ans a) no gas fumes or impurities are produced
b)cheaper steel is produced
c) no impurities exist in finished steel
Solution treatment after manufacturers have performed it out once can be carried out a further
a) 1 time
Ans b)2 times
c) 3 times
Following solution treatment aluminium alloy can be placed into service
a) straight away
b)after 24 hours
Ans c) after 5 days
The time between removal from heat treatment furnace and quenching must be not more than
Ans a) 3 seconds
b)7 seconds
c) 10 seconds
Specified time of contact between the indentor and test piece in a
vickers or brinell hardness test is
a) 10 seconds
Ans b)15 seconds
c) 20 seconds
In an Izod impact test the striking energy of the striker is approx
a) 150J
Ans b)163J
c) 300J
When buffing surface of Aluminium Alloy, what material are you removing
a) aluminium
b)alloy
Ans c) oxidised layer
When crimping, what chapter in the ATA system should you refer to?
Ans a) 20
b)24
c) 12
When checking the safety of turnbuckles you should use what?
Ans a) Wire the same diameter as the inspection hole
b)Wire smaller than inspection hole
c) Visual check
Anti-corrosive treatment used on Magnesium is
Ans a) chromating
b)phosphating
c) electro-plating
Fretting corrosion occurs with
Ans a) vibration in bolted parts
b)water trapped between moving parts
c) improper heat treatment
Intergranular corrosion is also known as what?
Ans a) Exfoliation
b)Galvanic
c) Stress corrosion
When normalising, the material is?
a) Quenched immediately
Ans b)Left to cool in room temperature
c) Cooled slowly
Why is clad alloy preferred to pure Aluminium?
Ans a) Tougher
b)Less brittle
c) More ductile
Why are aluminium alloys used on aircraft?
a) Lighter
Ans b)Stronger
c) Corrosion resistant
An internal circlip can be used to
a) retain a ball bearing on a shaft
Ans b)retain a ball bearing in a housing
c) to do both of the above
The colour coding of metals indicates
Ans a) specification only
b)specification and gauge
c) quality standard
Silver solder is made from
Ans a) zinc, copper, silver
b)zinc, copper, tin
c) zinc, copper, lead
How do you check a chain for elongation?
Ans a) Lay flat on a table, apply tensile load and measure
b)Hang chain up, check sight line and measure
c) Adjust the end fittings
Drive planes on an epicyclic gear are
a) at right angles to the plane
Ans b)around a common axis of the plane
c) at different angles to the plane
What type of material would hydraulic pipes on an undercarriage leg or bay be made from?
Ans a) Stainless steel, annealed, 14H
b)1100, 2024, in half hard state
c) 7075, H14
Music steel wire is
a) used for high strength springs and as progressive-rate springs
Ans b)used for lower strength springs
c) made of high carbon or nickel alloy
The magnesium alloys used in aircraft can be recognized by
Ans a) yellowish surface due to protective treatment
b)shiny surface due to chromium plated on the surface
c) silver surface due to protective coating
Compared with the spur gears, spiral gears have
a) more wear resistance
Ans b)less stress concentration on gears
c) have mechanical advantages
The crutch which can overrun the driving member, are known as
a) overload clutches
Ans b)freewheel clutches
c) no-slip clutches
Interconnect cables
Ans a) employ thinner insulation than airframe types
b)are used for equipment wire in the unified system
c) are the cable through the MEC to the engine
Slight waviness on a fibre composite structure
Ans a) may be tolerable if lightly loaded
b)could be reinforce with additional plies over the weakened area
c) may cause fatigue crack eventually
A washer having both twisted teeth and spring actions is
a) AN935 split-ring lock washer
Ans b)AN936 shake-proof lock washer
c) AN970 large-area flat washer
The tang of thread insert
a) must be removed
b)is removed with a hammer and a punch
Ans c) may left it in the insert after installation
The AN526 truss-head screw
a) is a widely used recesses head machine screw
b)provides a good clamping force
Ans c) is a pan-head screw
The first step for the coaxial cable to attach to the end fitting is
Ans a) the outer covering is cut back to expose the braided outer conductors
b)back-off the insulator and connect with conductor
c) use a tooling hold between the assembly and cable
A 'HUCK' rivet is similar in design to a
a) blind rivet
b) dome head rivet
Ans c) cherry rivet
A tab washer has been removed after fitment for a short time from a non essential system, the tab washer may be
a) re-used
Ans b) not re-used
c) re-used if a spare is not available
On a structural repair, what type of rivet would you use when the back sidecannot be accessed?
a) Hi-loc rivet
Ans b) Blind rivet
c) Pop rivet
What are the signs of fretting corrosion on steel?
a) Rust on surface
Ans b) Dark staining around area
c) Surface cracking as corrosion breaks through to surface of component
Taper pins are subject to what loads?
a) Tensile
b) Compressive
Ans c) Shear
Bending of stretched honeycomb is
a) with the web
Ans b) across the web
c) either way
A foot operated hydraulic swaging tools is checked for fluid level
a) vertically
Ans b) horizontally
c) only when operating pressure is reached
On a hydraulic swaging tool, the swage is formed when
a) swage pressure is reached on the gauge
b) the bypass valve closes and ram is neutrally loaded
Ans c) the bypass valve opens and ram is neutrally loaded
Bubbles are removed from a wet composite lay-up by
a) application of pressure
b) application of vacuum
Ans c) use of a roller
Interference in ribbon cables can be prevented by
Ans a) grounding alternate wires so that signal wires are never adjacent
b) the use of a common earth return between signal wires in the cable
c) using alternate return wires so that the cable differences cancel each other out
H.T. leads are made up of
a) multi-strand, multi-core, screened
Ans b) multi-strand, single-core, screened
c) single-strand, single-core, screened
Use of excessive hardener in polyester resin leads to
a) a less stiff joint
b) stiffer joint
Ans c) reduced pot life
The head marking on a close tolerance BSF bolt is
a) a lowered ring under the hexagon
b) a series of dots on the head face
Ans c) a raised disk on the head face
In the drawing, what letter represents the nominal length of a BSF bolt?
a) B
b) C
Ans c) A
In the drawing, both bolts are correctly wire locked when
Ans a) both A and B are right hand threads
b) both A and B are left hand threads
c) A is a right hand thread and B is a left hand thread
Turnbuckles are correctly fitted when
Ans a) the inspection hole is blind or the required number of threads are showing
b) both rods are seen to touch in the inspection hole
c) both rods enter the barrel by the same amount
Taper roller bearings are used for which of the following purposes?
Ans a) To transmit thrust loads with radial loads
b) To transmit radial loads whilst resisting axial movement
c) To permit axial movement whilst resisting radial load
Sheet metal should be stored
Ans a) on its edge in racks to prevent scratching
b) stacked flat to prevent bending of sheets
c) above 25 degrees centigrade
An aluminium alloy bolt may be identified by
Ans a) its colour (dyed green)
b) the letter A stamped on the head
c) its colour (dyed black)
A (British) 3/8" dia UNF bolt will have the diameter code letter
a) N
Ans b) J
c) G
The continuous coloured line on a hose assembly
Ans a) will assist in detection of any twist in an installed hose
b) identifies hose material
c) identifies fluid compatibility of hose
Clad aluminium alloy (alclad) has a pure aluminium coating of
Ans a) 5% of alloy thickness
b) 1% of alloy thickness
c) 0.002" regardless of alloy thickness
The main metal in monel is
Ans a) nickel
b) stainless steel
c) aluminium
Austenitic stainless steels are
a) magnetic
Ans b) non-magnetic
c) hardened by heat treatment
A tube complying to BS T51 is
a) tungum
Ans b) high pressure seamless copper tube
c) HTS tube
Adapter nipples are not required on
a) pipe to pipe coupling
b) pipe to internally coned adapter
Ans c) pipe to externally coned adapter
The storage life of a flexible hose can be up to but not exceeding
a) 2 years
b) 4 years
Ans c) 5 years
The markings on a flexible hose must include the
a) manufacturers name
Ans b) date of manufacture
c) internal bore size
The stationary race of a journal bearing is normally
Ans a) an interference fit
b) a push fit
c) a spigoted fit
Inspection of bearings is normally carried out
Ans a) in situ
b) when dismantled
c) when removed from an assembly
Damage to the shield of a bearing should result in
Ans a) rejection of the bearing
b) replacement of the shield
c) no action
The formation of steel depends upon
a) the formation of pearlite into austenite
b) the presence of pearlite in the structure
Ans c) the formation of austenite into pearlite
The teeth of a gear would normally be
a) nitrided
Ans b) case hardened
c) tempered
Which of the following could best be manufactured from Perspex panel?
Ans a) A passenger window
b) A radome
c) A cockpit windscreen
Titanium alloys
Ans a) have a high strength to weight ratio
b) are corrosion resistant but heavy
c) are cheap to manufacture
Why is nickel chromium used in many exhaust systems?
Ans a) Corrosion resistant and low expansion coefficient
b) Lightweight and flexible
c) Corrosion resistant and high heat conductivity
Which part of the 2017-T36 aluminium alloy designation indicates the primary alloying agent used in its manufacture?
Ans a) 2
b) 20
c) 17
Spilled mercury on aluminium
a) increases susceptibility to hydrogen embrittlement
Ans b) causes rapid and severe corrosion in prolonged contact
c) may cause impaired corrosion resistance if left in prolonged contact
Non-reversible chains can
a) only be moved in one direction
b) not be fitted through pressure bulkheads
Ans c) only be fitted in one direction
When fitting a replacement flexible hose
Ans a) ensure adequate clearance between the hose and the aircraft structure
b) use the old one to apply the 'set'
c) always pressure test before fitting
How is residual magnetism removed?
Ans a) Degaussing
b) EMC
c) EMI
The hardness of steel depends upon
a) the iron austenite grain structure
b) formation of pearlite into austenite
Ans c) formation of cementite
When the temperature increases on a hot bond repair is paused is is known as
a) ramping up
b) ramping down
Ans c) arrest point
What material is suitable for riveting steel?
Ans a) Monel
b) Copper
c) Aluminium alloy
Cadmium plated rivets should not be used where the temperature may exceed
a) 120oC
Ans b) 250oC
c) 200oC
High Tension leads are
a) multi-core, screened
b) solid-core, screened
Ans c) multi-strand, single core, screened
The difference between annealing and normalizing is
Ans a) both are heated above the UCT, cool slowly to anneal, cool in air to normalize
b) both are heated below the UCT, cool in air to anneal, cool slowly to normalize
c) both are heated above the UCT, cool in air to anneal, cool slowly to normalize
What rivets should be used with nickel alloy steel?
Ans a) Monel
b) Mild Steel
c) Aluminium Alloy
Kevlar and Nomex are types of
a) aluminium alloy
Ans b) advanced composite
c) glass fibre composite
How is the diameter of a cable measured?
Ans a) Overall diameter
b) Diameter of one wire multiplied by the number of wires
c) Diameter of one wire only
MIL-H-5606 hydraulic fluid O-rings are identified with a
Ans a) blue dot
b) yellow and white dot
c) yellow dot
The large diameter on a bevel gear is called the
Ans a) heel
b) toe
c) foot
Chemical attack is a direct result of
a) inter-granular corrosion
Ans b) cathodic & anodic changes in the material
c) filiform corrosion
A watermark on a bearing indicates
a) bearing running dry
b) lack of lubrication
Ans c) intergranular corrosion
To correctly tension cables it can help to
Ans a) have control surface locks in to support weight and adjust turnbuckles equally
b) take up initial slack by additional pulleys
c) use a cable run with turnbuckles at least every eight feet
Honeycomb for repair can be removed with
a) a drill
b) locally manufactured concave knife
Ans c) a router
Aircraft skin is joggled to
a) conform to the "Area rule"
Ans b) provide smooth airflow at faying surfaces
c) make a frame lighter but stronger
Dzuz Fasteners provide
a) for easy hammering into position
b) a close tolerance fit
Ans c) quick release fasteners at inspection panels
The pot life of a cold cured resin
a) increases with increase of temperature
b) is not reliant upon temperature fluctuations
Ans c) decreases with an increase in temperature
British turnbuckles are checked for safety by
Ans a) attempting to pass a hardened pin probe through the inspection hole
b) attempting to pass locking wire through the hole
c) looking through the hole and checking for threads showing
A full list of decals would be found in
a) ANOs
Ans b) Maintenance Manual
c) Aircraft log book
A Skydrol hydraulic seal would be made of
Ans a) butyl rubber, ethelene propylene or Teflon Phosphate Ester based
b) natural rubber vegetable based
c) synthetic rubber mineral based
The British system of heat treatment codes is
a) a series of numbers
Ans b) a series if letters
c) numbers and letters
What colour is used to identify a primary structure on a diagram or drawing?
a) Yellow
b) Green
Ans c) Red
If you are unable to identify a structure classification as either primary or secondary what action should you take?
a) Grade as secondary
Ans b) Upgrade as primary
c) Paint it red and stamp it as tertiary
What is meant by the term Pitch Ratio?
Ans a) The distance between two holes
b) The distance between the hole and the edge of the material
c) The area of contact between the two sheets of metal when joining by rivets
What is meant by the term Major Repair?
a) Repairs which can be made without dismantling for access and do not require the use of specialist tools
b) Repairs which can be made whilst the aircraft is enroute
Ans c) Repairs which require the use of special jigs, supports or jury structure and some dismantling
The length of solid rivets is in graduations of
a) 1/8 inch
b) ¼ inch
Ans c) 1/16 inch
What would be the diameter and length of a solid rivet if the following markings are given, AS 162-408?
a) ½ inch dia, 1 inch length
b) ¼ inch dia, ½ inch length
Ans c) 1/8 inch dia, ½ inch length
What would the marking .5 indicate after the normal part number of a solid rivet?
Ans a) Indicates close tolerance rivet
b) The diameter of the rivet is half an inch
c) The rivet length in graduations of 1/8 inch
What is the pressure range for the Avdel Riveter type F?
a) 20 to 60 psi
Ans b) 60 to 80 psi
c) 40 to 60 psi
What is the length of the operation stroke of the Avdel Riveter type F?
a) 7/8 inch
b) 1 inch
Ans c) ½ inch
With respect to ferrous metals which of the following is true?
a) Iron is not any element of ferrous metals
Ans b) Iron is a main element and all ferrous metal are magnetic
c) Iron is a main element and ferrous metal are not magnetic
The annealing process on steel is required sometimes as it
a) provides a corrosion resistant layer that prevents oxidation
Ans b) relieves internal stress suffered after engineering processes
c) allows the material a greater stress per unit area
The impact testing technique is used on a material to test for
a) hardness
Ans b) toughness
c) shear strain
Cobalt steel tested on the Brinell test would have a BHN number between
a) 100 to 175
b) 300 to 400
Ans c) 600 to 700
If a material is found to be in the tertiary phase of creep the following procedure should be implemented:
a) The crack should be stop drill, condition monitoring should be applied
Ans b) The component should be replaced immediately
c) The component should under go dye penetrant process and condition monitored
In a sheet metal store the following is marked on a sheet of aluminium alloy L162 (sheet 1). On a different sheet the marking L172 (sheet 2) is found, the following
is true:
Ans a) Sheet one is more ductile than sheet 2
b) Sheet two is of a thicker gauge than sheet 1
c) Sheet one has a shinier surface than sheet 2
Thermosetting adhesive, during their curing cycle give off
a) static radiation
Ans b) heat
c) carbon monoxide
The effect of a lower temperature than ambient during the curing period of a resin, will cause the curing time to
Ans a) increase
b) decrease
c) remain unchanged
Fretting corrosion occurs where
a) pitting corrosion is allowed to become more pronounced
b) a deep scratch increases to become fretting corrosion
Ans c) two material are subject to very slight movement between the two
The initials U.N.C when related to aircraft bolts stands for
a) United National Countersunk
b) Unified National Centred
Ans c) Unified National Coarse
Capped nuts are used so
a) the part is not over torqued as the bolt touches the captive part first
Ans b) to ensure that it is dry bolted
c) to prevent leaks from pipe ends
On a rear insert plug the tool is used to
a) insert the pins from the front and extracted from the rear
Ans b) insert the pins from the rear and extract from the rear
c) insert the pins from the rear and extract from the front
Wirelocking must be
a) less than 45o to the axis
b) less than 30o to the axis
Ans c) more than 45o to the axis
If a sheet of aluminium alloy of 0.032 and 0.064 is to be joined together the rivet should be
a) 0.064 plus 1D
Ans b) 0.096 plus 1.5 D
c) 0.032 plus 2D
A self aligning bearing is a
a) angular bearing
Ans b) radial bearing
c) precision bearing
A crankshaft would be fitted with a
a) spherical roller bearing
b) taper roller bearing
Ans c) cylindrical roller bearing
Where heat is likely to be transmitted through a bearing
a) group 2 bearings are used
b) group 3 bearings are used
Ans c) group 4 bearings are used
Shielded ball bearings are inspected by
a) running at operating speed and listening for signs of wear
b) dismantling and inspecting
Ans c) rotating slowly by hand
Thrust bearings take
Ans a) sideloads
b) journal loads
c) radial loads
How would you check the setting of an adjustable reamer
Ans a) ring guage
b) DTI and V blocks
c) external callipers
What is stress corrosion?
Ans a) Corrosion in an area under continuous loading
b) Corrosion in an area under cyclic loading
c) Corrosion due to fretting
What is used as the base covering on a honeycomb repair?
Ans a) Glass cloth or thin aluminium sheet
b) Plywood
c) Thick aluminium sheet
What is used for marking out steels?
a) Engineers blue
b) Wax crayon
Ans c) Copper sulphate
What is used to remove corrosion from magnesium?
Ans a) Chromic acid solution
b) Phosphate acid solution
c) Sulphuric acid solution
Where would a pop rivet with a break stem mandrel be used?
Ans a) In a closed structure
b) Where the head can be retrieved
c) Any situation calling for a pop rivet
A press fit requires
a) the hole to be expanded by heat
Ans b) some sort of driving force
c) the shaft to be shrunk by cooling
A chobert rivet gun may be used
a) once only
b) indefinately
Ans c) until the end has worn 0.002 inch below nominal diameter
Avdel rivets are closed by
a) squeezing
Ans b) broaching
c) a tapered mandrel
Surface corrosion on stainless steel is identified by
a) white film
Ans b) black pitting
c) red rust
Hooks, wires and other suspension devices used in an anodic bath should be made of
a) steel or copper
Ans b) aluminium or titanium
c) brass or copper
Phosphating of steels is carried out by immersing the steel in to a solution of
Ans a) phosphoric acid and metal phosphates
b) metal phosphates and sulphuric acid
c) nitric acid and sulphur
Electro chemical reaction is caused by the contact of
Ans a) dissimilar metals
b) moisture on the surface of the metal
c) bonding
When drilling a carbon fibre reinforced plastic use
Ans a) a tungsten drill
b) a steel drill and carbide powder
c) a drill with a pointed tip
Hydraulic pipes are made from
a) 1100 or 2020 H14
Ans b) annealed steel
c) 5056 or 7075
When laying up a glass fibre repair, the extra layer of fibre is
Ans a) a sacrificial layer for sanding
b) for extra strength
c) for shrinkage
Nickel coated cables temperature range is
a) 100 to 150oC
b) 150 to 200oC
Ans c) 200 to 250oC
Tempering entails
a) heating over the UCP and fast cooling
b) heating over the UCP and slow cooling
Ans c) heating under the UCP and slow cooling
A non metallic locknut is
a) never torqued
Ans b) never used over 250oF
c) never re-used
Aluminium wiring when flexed will
Ans a) work harden and embrittle
b) have no effect
c) have a higher resistance
Which can be re-used?
Ans a) Locking plate, circlip, spring washer
b) Tab washer, circlip, locking plate
c) Shake proof washer, spring washer, locking plate
A bolt part number AN25C15 when compared to a bolt part number AN25-15 has
a) a less expensive design and product costs
Ans b) a higher resistance to corrosion
c) a higher pitch thread
Countersunk rivets have two angles of countersink, these are
a) 125 - 135 degrees
b) 100 -160 degrees
Ans c) 100 - 115 degrees
On a CHERRY MAX rivet, after the riveting process the mandrel section or stem is
a) discarded
Ans b) remains in the rivet sleeve to provide mechanical strength
c) is ground down flush to rivet head
A single row ball bearing is best suited to accepting
a) axial and radial Loads
Ans b) radial loads only
c) axial loads only
During a inspection interval one segment of a long chain is found to be defective, the solution to this is to
a) replace the particular segment and run components to check for serviceability
b) replace 3 segment either side of the deficiency
Ans c) replace the whole chain
When fitting a replacement hacksaw blade, the new blade's teeth should face
a) towards the user
Ans b) away from the user
c) either direction, not dependent on safety or efficiency of saw
Cold working of a material is used to reduce
Ans a) wear of manufacturing tools
b) fatigue
c) material hardness
An S-N curve is useful in the design evaluation process for testing
a) shear force
Ans b) fatigue life
c) tension
British aircraft cables are classified by their
a) diameter and breaking load in Hundredweights
Ans b) breaking load in hundredweights
c) breaking loads in lbf, where 1 lbf = 4.448N
An American rivet with a cross on the head is
a) 2117 aluminium alloy
Ans b) 5056 aluminium alloy
c) 2124 aluminium alloy
A countersunk rivet of the ‘SP’ series has a head style of
a) 90o
Ans b) 100o
c) 20o
The lead on a single start thread is
a) 1/2 the pitch
Ans b) 1 x the pitch
c) 2 x the pitch
The coding of a British rivet indicates
a) head type and colour
b) length and diameter
Ans c) material and head type
At normal temperatures HC steel is harder because
a) it has more austenite
b) it has less austenite
Ans c) of the % of carbon in the granules
When mixing resin it is dangerous to add
Ans a) accelerator and catalyst before resin
b) catalyst and resin before accelerator
c) resin and accelerator before catalyst
Silver plated copper wire has a maximum working temp of
Ans a) 200 oC
b) 250 oC
c) 300 oC
In an autoclave to apply pressure
a) weights are used
Ans b) a vacuum bag is used
c) clamps are used
Precipitation treating makes the metal
a) harder, stronger and more ductile
Ans b) harder, stronger and less ductile
c) less strong and hard
The artificial production of a film of hydroxide on the surface of aluminium or any of its alloys is commonly called
a) alodizing
b) parco lubrizing
Ans c) anodizing
Intergrannular corrosion in structural aluminium alloy parts
a) are not likely to occur in parts fabricated from heat-treated sheet aluminium
b) may be detected by the white, powdery deposit formed on the surface of the metal
Ans c) cannot always be detected by surface indications
Corrosion will spread more rapidly when metals are exposed to
Ans a) high temperatures
b) dry climates
c) cold climates
A material has the code 2024-TH6 on it. Which part of the code indicates the percentage of the alloying element?
Ans a) 20
b) H
c) 6
A worm drive creates
a) a drive in 2 planes and 2 directions
b) a drive in 1 plane but 2 directions
Ans c) a drive in 2 planes but 1 direction
Colour identification of an aluminium rivet is
Ans a) black
b) violet
c) green
A factor which determines the minimum space between rivets is the
a) length of the rivets being used
Ans b) diameter of the rivets being used
c) thickness of the material being riveted
Joggles in removed rivet shanks would indicate partial
a) bearing failure
b) torsion failure
Ans c) shear failure
The teeth of a gear would normally be
a) nitrided
Ans b) case hardened
c) tempered
A rivet that has 5% magnesium is identified as
Ans a) anodic green and has an X
b) anodic violet and has an X
c) natural and has an m
If a chain is removed for routine maintenance
a) it must be proof checked to ½ max load
b) it must be proof checked to full load
Ans c) it does not have to be proof checked
Magnesium alloy components are protected by
a) an electro process
Ans b) a chemical process
c) a painted process
Corrosion products should be removed from magnesium alloys by the use of
Ans a) a solution of 10% by weight of chromic acid in distilled water with 0.1% by volume of sulphuric acid*
b) aluminium wool
c) a solution of 10% by volume of chromic acid in distilled water with 1% phosphoric acid
If it is necessary to remove corrosion from a steel component in-situ, the base of a suitable solution for this purpose is
a) chromic acid
b) nitric acid
Ans c) phosphoric acid
A type of protection which is applicable to magnesium alloys is the
a) phosphate process
b) coslettising process
Ans c) chromating process
Heavy corrosion deposits on clad aluminium alloys should be removed
a) mechanically using a pneumatic vibrator
b) chemically by use of trichloroethylene
Ans c) chemically by use of phosphoric acid
What action should be taken on finding intergrannular corrosion?
a) De-corrode and reprotect
b) Renew corroded area by patching
Ans c) Replace complete component part
Black streaks running away from a bolt or rivet would indicate
Ans a) fretting corrosion
b) exfoliation corrosion
c) intergrannular corrosion
Identification of British aluminium alloys is with
a) a letter and number code
Ans b) a colour and number stamped on the head
c) a part number on the head
On gear teeth, the wear pattern should be
a) the top edge most worn
b) the middle of the tooth most worn
Ans c) even
on bevel gear teeth, the wear pattern should be
a) greatest at the toe, tapering off to the heel
b) greatest at the heel, least at the toe
Ans c) at the centre of the tooth
Anodic treatment of aluminium alloy gives
Ans a) a pure coating of aluminium oxide on the surface
b) a shorter life due to hardening
c) a purple finish
Cables are preferred to other control systems because
Ans a) they are strong and light
b) they maintain slight mechanical advantage over push/pull systems
c) single braid allows for 2 way directions
If you can only gain limited access to both sides of a structure, what would you use to repair the structure?
Ans a) A hylok
b) A pop rivet
c) A blind rivet
Aluminium alloy with primarily magnesium is numbered
Ans a) 5025
b) 2025
c) 1025
Heat treatment is shown on an aluminium alloy by a
Ans a) letter code
b) number code
c) letter and number code
Bevel gears are
Ans a) all over case hardened
b) toe is hardened
c) heel is hardened
Nitriding is
Ans a) case hardening
b) anodising
c) tempering
Alloy rivets are heat treated by
a) annealing
b) anodising
Ans c) solution treating
When a solid rivet is formed it only holds 75% of its shear strength, the other 25% comes from
a) heating the completed assembly
b) cooling completed assembly
Ans c) leaving assembly for 4 days to age harden
For an electrical cable to be fireproof it must be able to stand 1100 deg C for
a) 10 mins
Ans b) 15 mins
c) 20 mins
Oxide on exposed silver plated wires is
a) non corrosive
Ans b) an insulator
c) a conductor
Turnbuckles depending on type are locked by
Ans a) locknuts and wire
b) stiffnuts
c) castleated nuts and splitpins
For a wire insert thread repair, the hole is tapped using
a) the next size up
Ans b) a special tap supplied with the kit
c) the same size
To install a flareless coupling
Ans a) turn until torque is felt plus 2 flats
b) turn until torque is felt plus 3 flats
c) hand tight plus 2 flats
Flexible pipes are identified by
a) diameter
b) length
Ans c) material
A pipe carrying lubricant would be identified by the colour
a) white
b) white and yellow
Ans c) yellow
A chain is checked for stiff links by
Ans a) running the chain over a finger by 180 degrees
b) hanging by hand by measure and sight
c) stretching out and measuring
Medium carbon steels have a carbon content of
Ans a) 0.3 - 0.5 %
b) 0.5 - 0.8 %
c) 0.8- 1.05 %
Brinell hardness testing measures
a) depth
Ans b) diameter
c) area
In the tensile strength test
a) the material is pulled to limit of elasticity
Ans b) the material is pulled to until it breaks
c) the material is pulled until it reaches its UTS
Impact resistance measures the
Ans a) material toughness
b) material hardness
c) material ductility
A ferrous metal contains
Ans a) iron
b) aluminium
c) magnesium
What is Alumina?
a) Aluminium ore
Ans b) A ceramic oxide of aluminium
c) An alloy of aluminium
Non heat treatable materials
a) by annealing
Ans b) can be hardened strain hardening or cold working
c) cannot be hardened
In corrosion, the electrode that loses electrons is
a) the cathode
Ans b) the anode
c) either the cathode or the anode depending upon the electrolyte
Which of these core materials will be used in the making of a composite material flat panel
a) rectangular core
Ans b) hexagonal core
c) flexible core
Corrosion at the grain boundaries is called
a) filiform
Ans b) intergrannular
c) fretting
What does MSDS stand for?
a) Maximum Structural Design System
Ans b) Material Safety Data Sheet
c) Metal Surface Dimension Sector
Which of these is a common coz for corrosion?
a) Water in fuel
Ans b) Spilled battery acid
c) Untreated metal
Most commonly used thread form in aviation is
a) round thread
b) buttress
Ans c) V thread
Pitch of a screw thread is defined as
Ans a) distance from the centre of one crest to the next
b) difference between major diameter and minor diameter
c) distance between the crest and the root of the thread
A bolt with a raised dash is
a) An standard
Ans b) Corrosion Resistant Steel
c) close tolerance
A rivet with no marking has the material code
Ans a) A
b) AD
c) D
A dowel will take what loads?
Ans a) shear
b) tensile
c) torsion
The advantage of circlips is
a) cheap
b) can be used for both inner and external applications
Ans c) Both a and c
Rivet MS 20426 has what head type?
a) Round
b) Universal
Ans c) CSK
Cable tension is maintained by
Ans a) a cable tension regulator
b) a grommet
c) a fair lead
Which material are hydraulic fluid hoses made from
a) Butyl
b) Teflon
Ans c) Rubber
What load are spring hooks subjected to?
a) tension
b) compressive
Ans c) bending
Where are needle roller bearings used
Ans a) where there are space restrictions
b) high speed operations
c) Where is fluid damped bearing used
Loads on tapered roller bearings
a) axial only
b) thrust only
Ans c) axial and thrust
A Hardy Spicer coupling has what type of bearings?
a) Plain bearings
b) Ball Bearings
Ans c) Needle bearings
Which of the following metals is an aluminium silicon alloy used mainly for casting?
a) Aldrey
b) Alclad
Ans c) Alpax
A co-axial cable is better than a normal cable because
Ans a) there is an electrostatic field around it which helps to reduce the electromagnetic field
b) weight for weight it can carry more signal
c) it has less resistance
A 0.5 in. diameter pipe is to be joined using standard nuts and fittings. What coupling would you use?
a) AN8-8852-2
Ans b) AN8-8852-8
c) AN8-8852-1
What metal is suitable for riveting magnesium alloy?
a) Monel metal
b) 1100 aluminium alloy
Ans c) 2024 aluminium alloy
What metal is suitable for riveting alloy steel
a) monel metal
Ans b) mild steel
c) aluminium alloy
What is the danger if a silver coated connector comes into contact with glycol de icing fluid
Ans a) Fire hazard
b) Corrosion
c) Wet arc tracking
When silver coated connectors are used in unpressurised parts of the aircraft
Ans a) corrosion can occur
b) wet track arcing can occur
c) separation of the coating can occur
When a steel part is welded, corrosion occurs because
Ans a) the strip has become cathodic
b) it is affected by spatter
c) the paint has been removed
Intergrannular corrosion
Ans a) may have no visual surface indication
b) can be recognized by a grey powder deposit
c) can be recognized by its flaking and lifting of the material layers
If aluminium alloy is not quenched after heat treatment is it will be
Ans a) brittle
b) subject to corrosion
c) malleable
Anodizing protects alloy metal from corrosion and does what else?
Ans a) Makes a good surface for paint to adhere to
b) Makes the surface alkaline
c) Seals the surface from moisture
Active flux does what?
Ans a) Cleans
b) Protects
c) Both cleans and protects
Jointing compound is used for what reason?
a) To make the components easier to disassemble
b) To bond the components together
Ans c) To prevent dissimilar metal corrosion
During vacuum bag lay-up the vacuum gauge is placed where?
a) Next to the vacuum port
Ans b) Opposite side to the vacuum port
c) Over the repair
An aluminium alloy rivet identification is
Ans a) D embossed
b) X embossed
c) O embossed
Rivet allowance is
Ans a) 1.5d
b) 1.5d plus the thickness of the material
c) 1d plus the thickness of the material
D and DD rivets are refrigerated to
Ans a) retard age hardening
b) increase age hardening
c) precipitation harden
What do you do to 2017 and 2024 rivets after heat treatment?
Ans a) Use immediately or refrigerate
b) Leave for a minimum of 2 hours before using
c) refrigerate for a minimum of 2 hours before using
Stepped curing has
Ans a) more than 2 dwell periods
b) variable cure time
c) no constant dwell period
To prevent damage to seals on fitment you would
a) use grease
b) compress and stretch them
Ans c) use a cardboard protector over the threaded portions
Maximum repair dimensions for use of microballoons?
Ans a) 10mm
b) 20mm
c) 30mm
In an autoclave what pressure would the vacuum alarm be set at
a) operating pressure
b) higher than operating pressure
Ans c) lower than operating pressure
Fibre strength is strongest in the direction of the
Ans a) warp
b) weft
c) bias
In an autoclave what would you cover the repair in?
Ans a) High temp nylon
b) Polythene
c) Polypropelene
If caustic soda turns a material black what is it?
a) Aluminium
b) Alclad
Ans c) Aluminium alloy
Intergrannular corrosion is caused by
Ans a) improper heat treatment
b) dissimilar metal contact
c) improperly assembled components
Galvanic action caused by dissimilar metal contact may best be prevented by
Ans a) applying a non-porous dielectric material between the surfaces
b) priming both the surfaces with a light coat of zinc chromate primer
c) Special precautions are not required if they are properly bonded
Corrosion caused by electrolytic action is the result of
a) excessive anodization
Ans b) contact between two unlike metals
c) the wrong quenching agent
102. A spring type washer when used on an aluminium component must be used
a) by itself
b) with a tab washer
Ans c) with a plain washer
Nickel alloy steel split pins can be used
a) repeatedly provided they remain a good fit
Ans b) only once, because the legs are spread and bent
c) with a spring washer and a stiff nut
The standard taper for a taper pin is
a) 1:20
Ans b) 1:48
c) 1:600
Corrosion may be regarded as the destruction of metal by
Ans a) electrochemical action
b) electromechanical action
c) hydroelectric action
Tempering steel gives
a) greater hardness
b) greater brittleness
Ans c) relief of internal stress after hardening
After welding, stainless steel is susceptible to a corrosion known as
Ans a) weld decay
b) weld rot
c) weld deterioration
The lifting or flaking of the metal at the surface due to delamination of grain boundaries caused by the pressure of corrosion is
a) electrolysis
b) transgranulation
Ans c) exfoliation
The addition of chromium to steel will produce
a) toughness
b) ductility
Ans c) hardness
A feather key locates a gear on a shaft and permits
a) a positive and strong drive for transmissions
Ans b) positive drive and axial movement
c) positive drive with the gear firmly locked
A pre-load indicating washer is correctly loaded when
a) the inner ring rotates
Ans b) the outer ring is gripped
c) the inner ring is gripped
What chemical is used to identify aluminium alloys
Ans a) caustic soda
b) copper sulphate
c) nitric acid
Multi-start threads
Ans a) increase the lead without increasing the pitch
b) increase the lead and the pitch
c) increase the lead and decrease the pitch
Pure aluminium is
Ans a) highly resistant to corrosion
b) not resistant to corrosion
c) reasonably resistant to corrosion
Cylinder containing purified oxygen for breathing are painted
a) black with a grey collar
Ans b) black with a white collar
c) grey with a white collar
Buttress threads are used
a) to transmit power in both directions
Ans b) to transmit power on one direction
c) on nuts and bolts
The electrolytic process that forms an oxide film on the surface of aluminium alloys is known as
a) electroplating
b) galvanizing
Ans c) anodizing
Studs which have a size larger thread at one end are called
Ans a) stepped studs
b) plain studs
c) shouldered studs
The conductor in tersil cable is
a) tinned copper
Ans b) nickel plated copper
c) stainless steel
A cable is marked NYVIN 22. The 22 represents the
a) current rating
b) current/weight ratio
Ans c) cross sectional area
Copper is an inferior conductor to aluminium when comparing
Ans a) weight for weight
b) CSA with CSA
c) load for load
Chromium added to plain carbon steel
a) turns it into a non-ferrous alloy
b) makes the metal softer
Ans c) increases it's resistance to corrosion
The purpose of case hardening is to
Ans a) produce a hard case over a tough core
b) introduce carbon into the steel
c) reduce the carbon in the steel
What is the indication of fretting corrosion on aluminium alloy?
Ans a) Black powder
b) Brown powder
c) White powder
Exfoliation corrosion is sometimes referred to as
Ans a) layer corrosion
b) sub-surface corrosion
c) filiform corrosion
What action is taken to protect integral tanks from corrosion due to micro-biological growth?
Ans a) A biocidal additive is used in the fuel
b) The inside of the tank is coated with yellow chromate
c) Rubber liners are installed in the tank
When dissimilar metals are brought together, or the same metal in different states, one metal forms the anode and the other the cathode. Which will suffer from corrosion?
a) The cathode
b) Both will corrode equally
Ans c) The anode
What type of corrosion attacks grain boundaries of aluminium alloys which are improperly or inadequately heat treated?
a) Stress corrosion
Ans b) Intergrannular corrosion
c) Surface corrosion
How do you check a chain for elongation?
Ans a) Apply a load, measure chain and use 2% max formula to check extension
b) Apply a load, measure chain and use 5% max formula to check extension
c) Hang the chain under its own weight, measure chain and use 2% max formula to check extension
How do you store a chain?
a) Lay uncoiled and flat in greaseproof paper
b) Hanged so they do not kink
Ans c) Oiled and coiled in greaseproof paper
An HT lead is
Ans a) single core screened
b) multi core screened
c) single core unscreened
Two parts of the adhesive process are
Ans a) wetting and setting
b) wetting and gripping
c) spreading and setting
A 14 gauge cable when compared to an 18 gauge cable has
a) lower current rating
Ans b) higher current rating
c) the same current rating
Types of adhesive joints are
a) cemented and specific
Ans b) mechanical and specific
c) mechanical and cemented
What tests are done on adhesive joints?
a) impact and shear
b) impact and peel
Ans c) peel and shear
An interconnect cable has what insulation?
Ans a) thinner than airframe cable
b) thicker than airframe cable
c) same thickness as airframe cable
Epicyclic gears are used on
Ans a) shafts rotating on the same axis
b) shafts rotating on offset axis
c) shafts rotating on axis 90 degrees from each other
What is the effect of heat on a cold cure resin?
a) Increase pot life
Ans b) Decrease pot life
c) No effect on pot life
Forming a solution treated rivet gives it 75% of its hardness. What gives it the other 25%?
a) Put them in a refrigerator
b) Precipitation treat the component when forming is complete
Ans c) Leave at room temperature for four hours
What two components of a three part polyester resin are dangerous to mix together directly?
Ans a) Accelerator and free catalyst
b) Catalyst and resin
c) Accelerator and resin
What is the effect of adding too much hardener to a resin?
a) The resin will not harden
Ans b) Makes the repair more brittle
c) No effect
How many times can clad alloy be treated?
Ans a) 3 times
b) as many times as required
c) Once only
Two parts of the adhesive process are
Ans a) wetting and setting
b) wetting and gripping
c) spreading and setting
What is the largest hole in honeycomb repairable with microballoons?
Ans a) 2.54 cm
b) 2.54 inches
c) 2.54 mm
If D or DD rivets are not broached in time , or removed from the freezer in time, they
Ans a) must be re-heat treated before use
b) can be re-heat treated once then discarded
c) must be discarded
How are flexible hoses categorised?
a) by length
Ans b) by maximum pressure
c) by diameter
A joggle in a removed rivet is indication of what type of partial failure?
Ans a) shear
b) bearing
c) compression
Over extended honeycomb can bend in which direction?
a) In all directions
b) Across the ribbon
Ans c) Along the ribbon
The vacuum connections in a fibre glass repair must overlap the
Ans a) breather mat
b) peel ply
c) top layer of glass fabric directly
The pattern of a gear is the
a) profile of the gear teeth
Ans b) mark it leaves on a mating gear
c) the path they take when the gear is rotating
How do you check a turnbuckle is in safety?
Ans a) Use the inspection hole or count the threads showing
b) Ensure that the turnbuckle cannot be turned by hand
c) Make sure no threads are showing at either end of the turnbuckle
Max temperature of tin coated copper cable?
Ans a) 105oC
b) 200oC
c) 260oC
The taper of a standard taper pin is
a) 1 in 36
b) 1 in 20
Ans c) 1 in 48
Spherical roller bearings resist what loads?
Ans a) Large radial and moderate thrust
b) Large thrust and moderate radial
c) Large radial but no thrust
What are the signs of fretting corrosion?
Ans a) black powder or cocoa staining
b) intergrannular cracking
c) flaking
Plug pins are numbered
a) from the outside in - clockwise
b) from the inside out - anticlockwise
Ans c) from the inside out - clockwise
What are the rigid pipes on gas turbine engines made from?
a) aluminium alloy
b) copper
Ans c) stainless steel
Equipment wire
Ans a) is flexible and suitable for soldering
b) can be used for interconnect wiring
c) has thicker insulation than interconnect wire
In the wiring code shown, what does the number 6 (4th number from the left) represent?
1EF6B22 NMS V
a) Cable size
Ans b) Cable number
c) Circuit function
An aluminium oxide layer on a conductor will do what when the temperature is increased?
Ans a) Become thicker
b) Become thinner
c) Remain the same
When not under load where should a pair of gears sit?
Ans a) In the middle
b) On the heel
c) On the toe
For a pair of gears to operate properly, they must have
Ans a) lash and pattern
b) end play and thrust
c) pattern and profile
Coil springs are made from
Ans a) carbon or high alloy steels with low working stress
b) carbon or alloy steels with high working stress
c) low carbon steels with high working stress
What is a coaxial cable?
Ans a) Two or more conductors
b) A twisted pair of conductors
c) A single conductor
What is the nominal length of a UNF bolt?
Ans a) Under head to screw threads (i.e. plain shank)
b) Under head to end of the threads
c) The length of the threads
How is a British al alloy rivet identified?
a) Natural anodised finish
b) Violet anodic finish
Ans c) Black anodic finish
What do you do if you forget to add hardener to a composite repair?
Ans a) Clean all traces of the resin away and start again
b) Add hardener at the edges and it will cure
c) It will cure eventually anyway
‘X’ on a cable indicates
a) emergency power
b) control system
Ans c) AC power
A BS rivet made from L36 would be what colour and marking?
Ans a) Black anodic
b) Green anodic
c) Natural anodic
The teeth on the smaller wheel of a bevel gear are called the
a) heel
Ans b) toe
c) foot
What must you be careful with a hot stamped cable?
Ans a) Wet arc tracking
b) Corrosion
c) Peeling of the insulation
Where should you not use a nyloc nut?
a) Temperatures above 200oC
Ans b) Temperatures above 120oC
c) Temperatures above 80oC
What is the nominal screw length?
a) The overall length of a bolt (from under the head) and the overall length of a screw (including the head)
Ans b) The overall length of a countersunk screw and the non-threaded portion of a bolt
c) The length of thread for a bolt, overall length for a countersunk screw
The correct meshing of gears is found on what part of the tooth?
a) Top
Ans b) Middle
c) Bottom
What type of gear would be used on a prop reduction gearbox?
Ans a) Epicyclic
b) Bevel
c) Split epicyclic
What is the effect of aluminium oxide on aluminium electrical cable?
a) Provides strength
b) Reduces resistance
Ans c) insulates
What is the effect of precipitation heat treatment on aluminium?
Ans a) It speeds up age hardening process
b) It softens the material to allow it to be worked
c) It delays the age hardening process
How do you assemble a banjo hose?
Ans a) Put washer either side of the banjo
b) Put a washer on the outside of the banjo only
c) Put a washer on the inside of the banjo only
The pitch of a screw thread is
a) crest to root
Ans b) crest to crest
c) 2 x crest to root
A single start thread the lead is
a) 2 x pitch
Ans b) 1 x pitch
c) ½ x pitch
How would you test a hydraulic hose?
a) Pressure test 1.0 x working pressure
Ans b) Pressure test 1.5 x working pressure
c) Pressure test 2.0 x working pressure
A unified thread is identified by
Ans a) 2 or 3 rings on the head
b) a raise ring on the head
c) an 'X' on the head
A wire thread insert tap is
a) slightly larger than the hole
Ans b) supplied in a fitting kit
c) slightly smaller than the hole
Aluminium exposed to air will
a) oxidise and become weaker
b) oxidise and become stronger
Ans c) oxidise and become electrically insulated
What do the letters and numbers on a British rivet mean?
a) material and finish
b) material specification only
Ans c) head shape, material and finish
A natural finish aluminium alloy rivet with a D on it is
Ans a) duralumin L37
b) aluminium L36
c) hiduminium L86
A 5% magnesium rivet is identified by
a) violet anodise with 'S' on it
Ans b) green anodise with ‘X’ on it
c) black anodise with 'A' on it
Why would you use microballoons as a filler?
a) It cross-links with the panel
b) It is the cheapest filler material
Ans c) it is the lightest filler material
Black streaks back from a rivet hole signify
a) galvanic corrosion
Ans b) fretting
c) intergrannular corrosion
An AN steel bolt is identified by what marking on the head?
a) 14E
Ans b) An 'X'
c) A dash
What care should you take with 2024-T3?
a) Do not bend at sharp angles
Ans b) Do not scratch or make nicks in it
c) Do not remove the surface of the sheet metal
Page 7 – Mod 6
When using a backing former on a composite repair you need to use
Ans a) cellophane
b) breather cloth
c) a vacuum bag
Heater mats should overlap the repair by
a) 4”
b) 6”
Ans c) 2”
When using a spring washer, the plane washer would be fitted
a) between head a spring
b) under the nut
Ans c) between spring and part
Composition of silver solder is
a) tin and lead
b) tin, lead and silver
Ans c) tin, lead, silver and antimony
How many times can you use a locking plate?
Ans a) As long as it remains serviceable
b) Once only
c) Until all the tabs have been broken off
Wire locking approach angles should not be less than
Ans a) 45o
b) 90o
c) 10o
Where would you find the inspection interval for chains?
a) Maintenance manual
Ans b) Maintenance schedule
c) Flight manual
What amperage is an 18 swg cable?
Ans a) 10 amp
b) 5 amp
c) 1 amp
A thermoplastic fibre reinforced composite is prepared by
a) etching
b) a solvent wipe
Ans c) corona method
A British close tolerance bolt is identified by
Ans a) a raised ring on the head
b) a dropped collar under the head
c) an 'X' on the head
A blind fastener described as external sleeve and internally threaded would be
a) a cherry lock
Ans b) a jo bolt
c) a rivnut
Comments
Post a Comment