Maintenance Quiz

1. Turbocharged piston engines experience ‘detonation’ more easily than normally aspirated engines because:

1. turbocharged engines operate with lower cylinder pressures and temperatures
2. the ‘detonation margin’ is larger on turbocharged engines
3. turbocharged engines operate with higher cylinder pressures and temperatures
4. the ‘detonation margin’ is insignificant on turbocharged engines

2. Regarding turbo-normalising:

1. the engine is turbocharged only to maximum sea level manifold pressure and keeps the engine at this pressure to cruising altitude 
2. power will be reduced as the aircraft climbs 
3. power will increase as the aircraft climbs, requiring a throttle reduction to prevent over‑boost
4. lean of peak operations are not recommended for turbo-normalised engines

3. Cherry-max rivets can be used to replace solid rivets because:

1. the centre stem is locked in place with a ring 
2. the mandrel is made of steel
3. the tail forms a larger bulb when set
4. cherry-max rivets don’t corrode

4. Maintenance errors are a significant and continuing threat to aviation safety. Errors may be reduced by:

1. maintenance personnel relying on company-introduced safety management systems rather than on personal responsibility
2. identifying and counteracting error production conditions in the company
3. introducing risk controls at the individual level rather than the company level
4. completely eliminating maintenance errors

5. Resin impregnated carbon fibre cloth is normally cured:

1. at room temperature over a 12-hour period
2. by the addition of pressure only
3. by the addition of heat only from a high temperature oven
4. with pressure and heat, for example, in an autoclave

6. There are many different types of wire used in the electrical system of an aircraft. Aluminium wire:

1. is more expensive than copper wire
2. is heavier than copper wire
3. is easier to solder than copper wire
4. hardens more readily when overworked than copper wire

7. Before new paint is applied to an aircraft that has been stripped and made ready for painting:

1. alodine is not required if a twin-pack epoxy etch primer is used
2. alodine is not required if an epoxy normal primer is used
3. a finish coat of epoxy paint can be applied, negating the requirement to use alodine or primers
4. a conversion coating such as alodine should be applied to the bare metal as the first defence against corrosion forming 

8. Primary flight controls are balanced to:

1. reduce control forces during flight
2. stop the onset of ‘flutter’ during flight 
3. increase the under-balance tendencies 
4. add weight to a control surface to give the pilot more control feel

9. O-rings manufactured from the elastomer nitrile (Buna ‘N’) has good resistance to:

1. ozone
2. petroleum products 
3. weather 
4. sunlight

10. MS29513 o-rings:

1. are used mainly in aviation fuel related roles such as primers, nozzles and pumps 
2. are resistant to all fuels including automotive fuel
3. should not be lubricated with fuel-proof grease
4. are manufactured from Viton

11. Correct gasket material must be chosen considering its operational environment:

1. rubber gaskets are not resistant to electricity or water
2. rubber gaskets cause corrosion when placed against aluminium
3. gaskets usually have a PxT rating factor, which refers to the pressure and temperature combination in their operating environment
4. the PxT rating factor is only applicable to neoprene gaskets

12. When examining an exhaust valve with a borescope, various patterns can be seen:

1. a valve covered with exhaust residue is unserviceable and should be repaired or replaced
2. a valve with a concentric ring pattern is unserviceable and should be repaired or replaced
3. a valve with a dark red/brown colour is unserviceable and should be repaired or replaced
4. a valve with a semi-circular pattern of a different colour adjacent to the valve seat is unserviceable and should be repaired or replaced 

answers:

1. (c)
2. (a)
3. (a)
4. (b)
5. (d)
6. (d)
7. (d)
8. (b)
9. (b)
10. (a)
11. (c)
12. (d)