Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CAA Module 11 > Module 11.13 Landing gear > Flashcards

Module 11.13 Landing gear Flashcards

1
Q

How is the main landing gear installed in a tail wheel configuration?

A

In front of the CoG

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Where are the main landing gear in reference to the CoG in a tricycle configuration?

A

Behind the CoG, this prevents ground looping

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a tandem gear configuration? How is it supported laterally?

A

Two gear aligned longitudinally

Outrigger gear give support

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What do fixed gear increase?

A

In-flight drag

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What gear would have a drag strut?

A

Gear that retract in the fore and aft direction i.e. Nose Landing Gear NLG

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the side and drag strut in gear connected to?

A

The outer structure of the cylinder and the structure of the aircraft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How is the side/drag strut held in place?

A

By a downlock mechanism/lock stay

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How is the side strut locked?

A

Downlock pulled into over centre position this is then held by two strong downlock springs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the purpose of the shortening link?

A

To shorten gear during retraction so it can fit in the wheel well

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does the gear pivot about?

A

Trunnion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What stops the gear spinning and falling out of the outer cylinder?

A

Torsion link

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the purpose of cams in the NLG?

A

Upper and lower locating cam come together to centre the gear when there is no weight on the wheels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Some NLG have a torque link damper, what is the purpose of this? Cause?

A

Shimmy damper, stops shimmy of the axle cause by uneven, pressure, wear or runway surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the two classes of shock absorbers?

A
  • Solid
  • Oleo-pneumatic
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the strut partially filled with?

A

Oil and nitrogen gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What do some oleo-pneumatic shock absorbers have?

A

Separator between oil and gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The cylinders are free to extend within the range of what?

A

The torsion link

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

When weight is applied to the wheels, what reduces the movement of fluid between the upper and lower oil chambers?

A

Flutter plate with restrictor valves

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What occurs to the shock absorbers when a force is applied? i.e. landing

A

Weight applied to wheels which compresses the gas this then forces the piston up. This moves the inner cylinder up and fluid to transfer from upper to lower chamber through the flutter plate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What occurs after the initial compression of cylinders?

A

Recoils back to an extended position

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is the shock strut dimension ‘X’ or ‘H’?

A

Extension of inner cylinder with weight on wheels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Where may the correct dimensions ‘X’ be found?

A

In graph with measured gas pressure and actual shock strut temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

In normal extension/retraction how should the gear be moved?

A

Movement should be powered

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is the only movement with a backup/emergency?

A

Extension

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
How are the different extension/retraction conditions commanded?
Normal - lever Emergency - Separate lever/handle
26
How is the lever protected from moving under vibration or accidental movement?
Detents
27
When the aircraft is on the ground, what stops the gear lever being moved?
Solenoid operated latch to stop movement. This is in the closed position when the power is off
28
Why is sequencing needed in gear movement?
To allow the doors to open prior to gear movement
29
What is the process of gear extension?
1. Door uplock released 2. Door opened 3. Gear uplock released 4. Gear down 5. Door close
30
What should be installed to lockstay during towing?
Locking pins
31
Emergency extension handles are connected to what via a mechanical linkage?
Gear uplock
32
How is the gear held in place in the wheel well when the gear is retracted?
Up-lock hooks
33
Before operation of the emergency extension handle, why must the landing gear selector be placed in the off position?
Shut off system pressure and connect actuator chambers, ' damping mode'. Prevent hydraulic lock
34
Visual indication of what is given during extension and retraction?
Position of gear and doors
35
Where are position sensors located in gear systems?
- Gear up-lock - Gear down-lock - Door Up-lock
36
What are microswitches used to monitor?
Position of: - Valves - Gears - Doors
37
When would a proximity switch be used instead of normal microswitch?
In areas of corrosion and contamination
38
What are the two different types of proximity switch?
- Reed switch - Electronic switch
39
When would a microswitch be used?
Where physical contact is permissible
40
What does the sensor consist of in a reed switch?
Two spring loaded contacts, that are normally open, in a glass tube filled with gas to stop corrosion
41
How are the contacts closed so that the circuit operates the indicator?
Target is moved close to the sensor. The target has a magnetic field. No contact is needed
42
In the electronic proximity switch, what is the target and sensor?
Target - non mag ferrous material Sensor - Sensing coil
43
What occurs to the coil when the target is nearby?
Varied impedance, triggers switching function
44
How is the wheel supported on the axle?
Tapered roller bearing
45
Aircraft wheels are made from what?
Forged or cast, aluminium alloy some are made from magnesium alloy
46
How are modern aircraft wheels constructed?
Two half hubs, inboard and outboard, that carry a tubeless tyre
47
What half of the wheel are the brake units attached to?
Inboard
48
How are the brake discs and wheels mated?
Steel drive keys bolted to the inside of the wheel
49
What prevents brake heat from damaging the wheels during normal braking?
Heat shield
50
What is the purpose of fusible plugs?
They release tyre pressure when the temperature exceeds a certain level, this is because it is plugged with a low melting point alloy
51
Where are fusible plugs not installed and why?
In the NLG as there are no brakes there
52
What half of the wheel are the fusible plugs in?
Inboard half
53
What half of the wheel is the inflating valve?
Outboard half
54
What half of the wheel are the tapered roller bearings?
Both
55
How are small light aircraft typically braked?
Using a single brake discs which is keyed or bolted to the wheel and turns with the wheel
56
Where are the 6 brake lining/pucks located?
3 are attached to each piston and the other 3 are stationary on the other side of the disc
57
When would dual discs brakes be used?
On aircraft that require more friction to slow them down i.e. heavier aircraft
58
What is located between the two discs?
Friction lining
59
What is the auto adjusting pin or wear indicating pin used for?
To indicate the wear of the friction lining
60
Large aircraft require multiple disc brakes, what are the main components of these?
- Torsion tube - Piston housing - Heat pack
61
What has slots to engage with the drive keys on the inboard half of the wheels?
Rotors
62
What is the wear indicating pin located on in a multi disk brake pack?
The stators
63
When should the wear indicating pin be checked to see if there is sufficient material on the stator?
When the brakes are applied
64
What is the benefit of carbon packs?
- 40% lighter than steel packs - Can deal with 50% higher temperatures than steel - 20-50% longer life
65
What is the advantage to segmented brakes?
Less bending due to heat
66
If a pack has 14 pistons how many hydraulic systems supply these?
1 - Supplies 7 called the normal braking 1 - Supplies 7 called the alternate braking
67
How is the switch between normal and alternate braking made and via what?
It is done automatically and via a shuttle valve
68
What controls the hydraulic fluid to the brakes?
Brake control valve
69
Where would the brake debooster be located?
Between the brake control valve and the user
70
How is the parking brake pressure kept?
Via a shutoff valve
71
How is permanent pressurisation of the parking brake maintained?
Brake accumulator
72
What does the ant skid system do?
Senses skid by changed in difference between a/c speed and wheel speed. It will release the brakes for a brief period
73
In an electronic system where would the anti skid valve be located?
After the brake control valve before debooster
74
What is the wheel speed sensor called?
Tacometer
75
How are tyres classified?
- Width - Rim diameter
76
How are tyres categorised?
- Tubed - Tubless
77
What is the fabric layer assembly in a tyre called?
Carcass
78
What angle of plies in a bias?
30° and 60°
79
What angle are radial plies laid?
90° to the direction of wheel spin
80
What keeps the tyre on the wheel?
The bead
81
What does the red dot signify on a tyre?
Lightest point of the tyre
82
What do the green dots signify on a tyre?
Small holes to let out entrapped gases
83
What carries the stator rotor assembly?
The torque tube
84
In an emergency what provides brake pressure?
The brake accumulator
85
When must brake not be applied?
At touchdown, as it can cause a blowout
86
In touchdown protection, what valve is controlled?
The anti skid valve
87
What is the purpose of auto brake?
To stop the aircraft at a certain deceleration rate without the pilots input
88
When would each auto brake position be used?
- Low and medium normal landing - Max on a rejected take off
89
What is on ramp stage of landing roll?
- Smooth build up of pressure to the desired deceleration rate
90
What is on auto braking stage of landing roll?
- Constant brake pressure level
91
What is on off ramp stage of landing roll?
- Smooth decrease in brake pressure, initiated when the speed brakes retract or pilot operates the brakes
92
How can the aircraft be steered if the NLG steering is in operative?
Differential braking
93
How is the NLG steered?
By moving the rotatable collar
94
On the NLG what is the upper tension link attached to?
The rotating collar
95
How may the rotatable collar be actuated?
Hydraulically or mechanically
96
What gear would a shimmy damper be fitted to?
NLG
97
Where would a shimmy damper be fitted?
On the torsion link or collar
98
Why may the aircraft have main gear steering?
To reduce tire scrubbing
99
Is the main gear steering angle more or less than the NLG?
Less - 5° - 8°
100
What must be done the NWS before towing?
Depressurised or isolated
101
Air ground sensing uses what sensor?
Proximity sensor
102
Where are the proximity sensors located?
Shock struts
103
What is used also on 4-6 wheel MLG to help air ground sensing?
Bogie bar
104
In modern aircraft (brand new) what may be used instead of proximity sensors?
Load sensors on landing gear beam

CAA Module 11 (22 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions