DGCA & EASA Module 15 : Part-19 Engine Storage, Preservation & Powerplant Installation Question
DGCA & EASA Module 15 : Part-19 Engine Storage, Preservation & Powerplant Installation Question-Answer
Engine Storage and Preservation.
1. Fuel system inhibiting oil is.
A. mineral oil.
B. light anti-freeze oil.
C. kerosene.
Ans : mineral oil.
Explanation: C.A.I.Ps EL/3-14 refers to mineral oil.
2. After placing an engine in an M.V.P envelope.
A. check humidity indicator after 12 hours.
B. check humidity indicator after 24 hours.
C. check humidity indicator after 48 hours.
Ans : check humidity indicator after 24 hours.
Explanation: Old C.A.I.Ps leaflet EL/3-14 refers.
3. On a vapour proof cocoon, there is a.
A. temperature indicator.
B. moisture indicator.
C. humidifier.
Ans : moisture indicator.
Explanation: C.A.I.Ps EL/3-14 refers.
4. When an installed engine is not to be used for a period of up to 7 days.
A. it is necessary to inhibit the engine.
B. it is only necessary to blank off all apertures.
C. run the engine as prescribed in the Flight Manual.
Ans : it is only necessary to blank off all apertures.
Explanation: C.A.I.Ps EL/3-14.
5. Installed engines must be re-preserved after preservation at least every.
A. six weeks.
B. six days.
C. six months.
Ans : six months.
Explanation: C.A.I.Ps EL/3-14.
6. On storage of an engine, the desiccant is.
A. looked at within 24 hrs if its blue its OK.
B. looked at 24 hrs later if its blue its OK.
C. looked at 24 hrs later if blue it should be replaced.
Ans : looked at 24 hrs later if its blue its OK.
Explanation: C.A.I.P's EL/3-14 (Engine Storage) refers. Note that answer a is partly correct, but you must also inspect the MVP envelope for damage or deterioration.
7. After placing an engine into storage, details would be recorded in.
A. Technical Log.
B. Engine log book.
C. Aircraft log book.
Ans : Engine log book.
Explanation: All engines have a log book.
8. When storing an engine the fuel system is to be inhibited. How is this done?.
A. Remove plugs rotate engine then add oil.
B. Rotate engine whilst adding oil then remove plugs.
C. Add oil leaving plugs in.
Ans : Remove plugs rotate engine then add oil.
Explanation: C.A.I.P's EL 3-14 (Engine storage)refers. This is a piston engine question but has been reported as being in a module 15 exam.
9. An engine in storage for 7 days should.
A. have storage oil placed in engine.
B. be run twice in that week.
C. be fitted with covers and blanks and apertures covered.
Ans : be fitted with covers and blanks and apertures covered.
Explanation: Old C.A.I.P's EL/3-4 refers.
10. On a (VP) cocoon bag, if the humidity indicator turns pink/lilac.
A. desiccant is effective and does not need changing.
B. desiccant is ineffective and needs changing.
C. desiccant is changed weekly.
Ans : desiccant is ineffective and needs changing.
Explanation: C.A.I.P's EL/3-4 refers.
11. To inhibit the fuel system of an installed engine.
A. pump oil into the engine when stationary.
B. dry motor the engine.
C. remove the ignitor plugs.
Ans : dry motor the engine.
Explanation: C.A.I.P's EL 3-10 details this procedure. It is done by dry motoring the engine with a header tank of inhibiting oil connected to the inlet of the L.P fuel pump.
12. When is the humidity indicator checked on a preserved engine?.
A. 1 Month.
B. 1 Year.
C. 6 Months.
Ans : 1 Month.
Explanation: C.A.A.I.Ps leaflet 7-4 states 'approximately monthly intervals'. If the desiccant is pink the envelope must be opened, the desiccant replaced and the envelope resealed.
13. With an engine in storage, desiccant is used.
A. as an insecticide.
B. as a corrosion inhibitor.
C. to remove moisture from the air.
Ans : to remove moisture from the air.
Explanation: A&C Mechanics Handbook EA-AC65 page 389 refers.
14. Small cuts in a M.V.P. engine storage bag can be repaired.
A. with adhesive PVC tape.
B. by vulcanising.
C. by replacing M.V.P.
Ans : with adhesive PVC tape.
Explanation: NIL.
15. When removing an engine for long-term storage, bleed valves should be.
A. removed.
B. locked closed.
C. open but blanked.
Ans : open but blanked.
Explanation: NIL.
Powerplant Installation
1. Pipes, electrical cables and associated components of a fire-detection system should be.
A. fire resistant.
B. fire proof.
C. fire retardant.
Ans : fire resistant.
Explanation: Sensors are set to actuate at a temperature below melting point of the detector and its associated cables.
2. The minimum bend radius for a continuous loop type fire wire is.
A. 1/2 inch.
B. 1/8 inch.
C. 1 inch.
Ans : 1 inch.
Explanation: NIL.
3. Acoustic linings made from composite materials are used in what section of the engine?
A. Not used to suppress noise.
B. Hot section & Cold Section.
C. Cold section only.
Ans : Cold section only.
Explanation: RR Page 205 Para 18 refers, but see also Jeppesen Aircraft Gas Turbine Powerplant Page 3-5.
4. Vibration mounts are used for.
A. stopping vibrations entering the engines.
B. preventing engine vibration loads being transmitted to the airframe structure.
C. damping out vibration stresses on engine when being transported on an engine stand.
Ans : preventing engine vibration loads being transmitted to the airframe structure.
Explanation: Small GTE's such as the A.P.U in Boeing 757 and 767 use anti vibration mounts.
5. An aircraft has a heavy landing and on inspection of the engine mounting bolts the bolts torque loading has reduced, you should.
A. add washers to take up any gap or slackness and re-torque to correct value.
B. remove bolt and carry out inspection as the bolt may have increased in length due to heavy landing.
C. re-torque bolt up to correct torque value.
Ans : remove bolt and carry out inspection as the bolt may have increased in length due to heavy landing.
Explanation: If the bolt has stretched answers a or b will not return the bolts to the original strength!!.
6. Forward engine mounts take which loads?.
A. Thrust, vertical and shear loads.
B. Centrifugal, thrust and axial.
C. Thrust, vertical and impact.
Ans : Thrust, vertical and shear loads.
Explanation: This question is referring to pylon mounted engine mounts.
7. Forward engine mounts take which form?.
A. Castings.
B. Forgings.
C. Fabricated sheet steel.
Ans : Forgings.
Explanation: Forgings are the strongest form of manufacture for substantial structure.
8. Pipes around engines are.
A. aluminium.
B. mild seamless steel.
C. stainless steel.
Ans : stainless steel.
Explanation: Stainless Steel is best for corrosion and heat resistance.
9. Fibrous metallic lining for noise suppression is used.
A. for lobe type noise suppressors.
B. in cold area.
C. in hot area.
Ans : in hot area.
Explanation: Rolls Royce The Jet engine Page 205 refers.
10. Noise lining in the fan area is made from.
A. layers of bonded resin.
B. porous type Honeycomb and backing sheet.
C. felt with aluminium sheet.
Ans : porous type Honeycomb and backing sheet.
Explanation: Rolls Royce The Jet engine Page 205 refers.
11. A powerplant consists of.
A. a basic engine plus E.C.U.
B. a basic engine plus thrust reverser, exhaust system and gear box with accessories.
C. the complete engine as it would be found on aircraft including all connections, controls, cowlings, intake etc.
Ans : the complete engine as it would be found on aircraft including all connections, controls, cowlings, intake etc.
Explanation: Rolls Royce the Jet Engine Page 243 para 1 refers.
12. Acoustic blankets are installed to.
A. reduce noise levels.
B. increase thermal efficiency.
C. aid the streamlining of the engine.
Ans : reduce noise levels.
Explanation: Acoustic blankets are used in both hot and cold sections. The material depends on the temperature.
13. When checking the effect of inertia on the engine after heavy landing you would first check the.
A. thrust line.
B. compressor shaft for distortion.
C. module alignment.
Ans : module alignment.
Explanation: We assume that 'the module' means the powerplant, an initial check will always be the general visual of the powerplant and its cowlings.
14. Following the reports of a heavy landing you would.
A. carry out a complete visual examination of the power plant.
B. examine the engine mountings and borescope the nozzle guide vanes and turbine.
C. examine the engine mountings and fuse pins.
Ans : carry out a complete visual examination of the power plant.
Explanation: C.A.A.I.Ps Leaflet 6-3 refers to inspection of pylons, mounts and cowlings. As all of these form part of the Powerplant then answer b is most correct.
15. The purpose of spring back and cushion on an engine power lever is.
A. used when friction builds up in a system.
B. used to prevent the controls hitting the fuel control stops.
C. used when full travel is used but slight movement is still required on the fuel control unit.
Ans : used when full travel is used but slight movement is still required on the fuel control unit.
Explanation: See the dash-pot throttle in RR The Jet Engine page 101.
16. What are sometimes installed in an engine mounting system to tune out the worst engine vibrations?.
A. Spring cushioned mounting pads.
B. Vibration absorbers of calibrated weight.
C. Rubber encased wire-mesh vibration isolators.
Ans : Rubber encased wire-mesh vibration isolators.
Explanation: A.P.U's use this sort of engine mount.
17. Where are the lifting points on a high bypass turbine engine?.
A. On the fan and compressor casing.
B. On the fan, turbine and compressor casing.
C. On the fan and turbine casing.
Ans : On the fan and turbine casing.
Explanation: Assuming this means lifting with a typical bootstrap kit forward and aft mounts attach to the winches.
18. Rubber anti-vibration pads are fitted to engine.
A. components to prevent fatigue.
B. cradles to prevent damage during transportation.
C. pylons to prevent vibration through the airframe.
Ans : pylons to prevent vibration through the airframe.
Explanation: Quite often used in conjunction with cone bolt mountings.
19. Engine thrust is transmitted through mountings that.
A. are designed to transmit eng thrust equally through front and rear supports.
B. are designed to prevent the thrust line of the engine varying.
C. allow for radial and axial expansion.
Ans : allow for radial and axial expansion.
Explanation: NIL.
20. If you reduced the length of bellcrank (2) what would happen to the input to the F.C.U?.
A. remain the same.
B. reduce.
C. increase.
Ans : increase.
Explanation: Reducing the arm from points 1 to 2 would decrease the arm length from the centre of rotation on the F.C.U to the connection on the belcrank. This would INCREASE the amount of rotary movement into the F.C.U.
Other Que.
1. The types of water present in aviation fuel are.
A. free and entrained both harmful.
B. free that is harmful and entrained that is harmless.
C. free that is harmless and entrained that is harmful.
Ans : free and entrained both harmful.
Explanation: NIL.
2. Oil pressure and scavenge pumps are usually.
A. spur gear pumps.
B. multi-plunger pumps.
C. diaphragm pumps.
Ans : spur gear pumps.
Explanation: NIL.
3. The purpose of a pressure filter in a lubrication system is to.
A. protect the pressure pump.
B. protect the oil jets.
C. protect the scavenge pumps.
Ans : protect the oil jets.
Explanation: NIL.
4. a curvic coupling.
A. converts rotary motion to reciprocating motion.
B. absorbs misalignment between the driving and driven shafts.
C. accurately aligns the driving and the driven shafts.
Ans : accurately aligns the driving and the driven shafts.
Explanation: NIL.
5. Feeders are.
A. conduits used to carry electrical cable.
B. fluid supply hoses.
C. heavy duty electrical generator cables.
Ans : heavy duty electrical generator cables.
Explanation: NIL.
6. High air humidity will.
A. have no affect on thrust.
B. reduce the thrust output.
C. increase the thrust output.
Ans : reduce the thrust output.
Explanation: NIL.
7. C.I.T sensor is made up of.
A. Iron-constantan.
B. Chromel-alumel.
C. Platinum-rhodium.
Ans : Platinum-rhodium.
Explanation: NIL. http://www.megatron.co.il/Thermocouple.html
8. What is the maximum value of pressure with reference to a jet engine?.
A. 1 Bar.
B. 1 Kg/cm.
C. 1 Atmospheric Pressure.
Ans : 1 Atmospheric Pressure.
Explanation: 1 Atm. = 1.013 Bar.
9. The hottest casing is the.
A. H.PT.
B. combustion chamber.
C. L.PT.
Ans : H.PT.
Explanation: NIL.
10. Centrifugal compressor maximum tip speed is.
A. 0.8 Mach.
B. 1.2 Mach.
C. 0.5 Mach.
Ans : 1.2 Mach.
Explanation: NIL.
11. What type of oil is used in a gas turbine engine?.
A. Synthetic.
B. Phosphate Ester.
C. Mineral.
Ans : Synthetic.
Explanation: Synthetic.
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