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M15 Lewis > 15.19 > Flashcards

15.19 Flashcards

1
Q

What loads does the engine attachment bolts carry and how many attachment bolts are there

A

Vertical & 4 bolts

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2
Q

In the fwd engine mount what’s the thrust and side loads transferred to

A

Shear pins

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3
Q

How’s the support beam for engine fwd mount connected to the frame

A

By centre centre normally a spherical bearing
By two thrust links via a cross beam

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4
Q

What axis’s do fwd mount constructions transfer forces in

A

Y and z
Weight ans side loads

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5
Q

What are the aft engine mounts connected to

A

Engine turbine frame by links at 3 points

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6
Q

What axis can aft engine mounts ONLY transfer loads in

A

Vertical

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7
Q

What is used to secure the engine to the upper nacelle and what benefit does it have

A

Resilient rubber mounts
Reduce vibration and torque effects

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8
Q

What type of links are used to support the engine at the rear

A

Swinging links

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9
Q

What defects on anti vibration mounts are looked for and what ones doesn’t require a replacement

A

Cracking, pitting, corrosion ( doesn’t have to unless exceeds AMM regulations) dimensions

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10
Q

What type of connectors are used on modern engines and how can it be identified?
What’s a benefit of these connectors

A

Bayonet
Three separate threads
They allow for a quick disconnect

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11
Q

What’s the standard method for all wing mounted engines

A

Bootstrap method

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12
Q

What makes the bootstrap method for removing engines more Tim consuming

A

Pylon fairing must be removed before hand

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13
Q

What’s a disadvantage and an advantage of the crane supported sling method for removing engines

A

Expensive

30% less time consuming

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14
Q

What’s the shape of the arm used in crane supported slings for removal of engines

A

g shaped

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15
Q

How are control levers ans nobs easily identified

A

Different shape and coloured

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16
Q

What’s the purpose of a friction damper in a throttle lever assembly

A

Prevent any movement of the lever during vibration

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17
Q

What’s control rigging

A

The final adjustment of control system to provide correct input to the engines.

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18
Q

What should rigging pins have attached to them for safety

A

Red flags

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19
Q

What should be done after control rigging

A

Carry out a engine ground run for power check and synchronisation

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20
Q

What are the main components of the drain system

A

Drain lines and module assembly where all drain lines end

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21
Q

What’s the lower part of the module assembly in drain system

A

Drain mast

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22
Q

What fluid leaks collected from on gearbox

A

All drive pad seals

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23
Q

Where else is a drain outlet usually located

A

On pylon

24
Q

What does the most important outlet drain, drain overboard and why

A

Fuel as if it’s allowed to collected it Could eventually drip on engine and cause a fire

25
Q

What is created on the drain mast after a leakage of a component to help identifying the origin of the leak

A

Visible track

26
Q

What’s a leak rate test

A

A test to decide is a leak is acceptable or not ( fluids collected in bottle and quantity collected is checked with AMM limits)

27
Q

How many holding tanks are in a drain collector assembly

A

2

28
Q

Where does the liquid goes in the drain collector if the collector is full and what does this mean

A

Overflow to holding tank
Very high leak rate

29
Q

What’s used to empty holding tanks

A

Ram air that enters on front side of the drain mast

30
Q

At what air speed does the ram air cause the holding tanks to drain ans how

A

200 knots
Pressure opens a spring loaded valve and pressurises tank

31
Q

What are firewalls made off

A

Steel ans titanium

32
Q

What axis does side loads along along and what mounts carry the loads

A

Lateral
Fwd and aft mounts

33
Q

What axis does thrust act along and what engine mounts transfer thrust

A

Longitudinal/rotational axis
Fwd mount

34
Q

What axis does engine weight act along and what mount carries the weight

A

Vertical
Both

35
Q

How many attachment points do the engine have to the pylon

A

2 (fwd ans aft)

36
Q

How are engines attached to its mounted point

A

Pylon or engine strut

37
Q

What must happen if a pressure relief doors found in open position

A

Must check all components behind for air leaks

38
Q

What do acoustic panels do

A

Reduce noise by absorbing acoustic energy and converting it to heat energy

39
Q

What type of materials are used for acoustic panels in high and low temp areas

A

Low temp- composite
High temp- fibrous metallic materials

40
Q

What are the two main components of a exhaust nozzle

A

Centre body and exhaust sleeve

41
Q

What’s the core cowling always made from and why

A

Metal as it’s hot

42
Q

What are the two fire protection techniques method on reverser fan cowling

A

Fire seals on connection to fan frame
Fire protective coating on inner side of cowling

43
Q

What happens as a result of high aerodynamic loads on fan reverser and what’s able to prevent this

A

Slight deformation causing tip rub on one side of rotor and excessive clearance on other
V shapes grooves are used to give stiff shape to prevent

44
Q

How’s the fan reverse cowling opened and why

A

Hydraulically cuz it’s heavy

As it’s made of titanium and steel

45
Q

What two parts make up the fan reverser cowling

A

Fixed reverser structure
Moveable reverser structure

46
Q

What is the other name for fan reverser cowlings known as

A

C ducts

47
Q

What system is the fan reverser cowling a part of

A

Thrust reverser system

48
Q

What are some precautions to note before opening cowlings

A

Mustn’t open in strong winds
Slats may have to be retracted
Some towing in certain ac isn’t permitted with cowls fully open

49
Q

How many different angles can the fan reverser doors be latched at

A

2

50
Q

What does the telescopic tube attached to the fan cowling prevent

A

Prevents the cowling pushing to for upwards and damaging hinge components

51
Q

What does the nacelle provide

A

Aerodynamic smoothness and protects engine against damage by pressure or fod

52
Q

What does the fan cowling cover

A

Covers stator case and accessory gearbox

53
Q

What helps to assist the correct installation of air inlet cowlings

A

Two index pins

54
Q

What’s connected on the inner barrel and why? What’s contained on the nose lip and why?

A

Nose lip- heated to prevent ice
Inner barrel- acoustic linings to prevent noise

55
Q

What’s the only part of the external engine that’s not two piece construction

A

Air inlet

56
Q

What parts of the surface must have a class 1 aerodynamic smoothness? Class 2?

A

Most crit parts of surface = 1
Others =2

M15 Lewis (18 decks)

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