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PSA CA Upgrade > Landing gear and brakes > Flashcards

Landing gear and brakes Flashcards

1
Q

MLG components

A

Nitrogen charged/oil filled shock strut
A folding side stay assembly
Shimmy dampers
Dual wheels and brake assemblies
Hydraulic actuators
Auxiliary actuators

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2
Q

How are the MLG held in the up and locked position?

A

A mechanical lock

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3
Q

How are the MLG unlocked extended and retracted?

A

Buy hydraulic actuators

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4
Q

How are the MLG locked in the extended position?

A

The side state assembly has an over center lock link mechanism

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5
Q

Type of MLG
Components

A

Double wheel retracting type
1. Nitrogen charged/oil filled shock strut
2. Folding side stay assembly.
3. Shimmy dampers.
4. Dual wheels and brake assemblies.
5. Hydraulic actuators.
6. Auxiliary actuators.

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6
Q

NLG type
Components

A

Double wheel retracting type
1. Nitrogen charged/oil filled shock strut.
2. Drag brace assembly.
3. Springs.
4. lock actuator.
5. Retract actuator.
6. Dual wheel assemblies.
7. Nose wheel steering components.

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7
Q

How does the NLG lock?

A

It locks in both the extended and retracted positions with a spring loaded, over-center type locking mechanism. A lock actuator moves the locking mechanism out of the over-center condition at the beginning of each extend or retract cycle.

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8
Q

The nose gear will not extend with the loss of which hydraulic systems?

A

Hydraulic systems 2 and 3

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9
Q

What does the proximity sensor system (PSS) entail?

A

Sensors are mounted on the landing gear and landing gear doors to supply position and control information to the PSEU (proximity sensor electronics unit). The PSEU provides landing gear position indication to the DCU’s for display on the EICAS primary page.

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10
Q

Proximity sensing system (PSS) 5 basic functions

A
  1. Landing gear positioning control.
  2. Landing gear position indication
  3. Weight on wheels indication.
  4. Fuselage door indication.
  5. Thrust reverser indication.
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11
Q

How long is the landing gear position indication shown?

A

It is removed 30 seconds after the landing gear is in the up and locked position with the flaps at 0

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12
Q

How does the downlock release switch work?

A

It is spring loaded to the off position. Move down and hold in the down position to manually override the landing gear control lever solenoid lock.

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13
Q

Which hydraulic system retracts or extends the landing gear?

A

Hydraulic system 3 pressure

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14
Q

Gear extension
Extended
Retraction speeds

A

220
220
200

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15
Q

What is the landing gear manual release for?

A

Used to manually lower the landing gear. Pull and hold handle in the fully extended position until EICAS indicates the nose and main landing gear are down and locked. (Considerable force is required to operate the landing gear manual release system)

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16
Q

What does the configuration warning system monitor?

A

Airspeed, position of thrust levers, flaps and landing gear positions, vertical speed, and radio altimeter inputs

17
Q

When does the “TOO LOW GEAR” oral warning sound?

A

If any landing gear is not down and locked with the radio altitude less than 500 feet AGL and the indicated airspeed at less than 190 KIAS

18
Q

How many fusible plugs are on the main wheel assembly and what do they do?

A

4
They are heat sensitive, fusible plugs that release excessive air pressure caused by heat buildup. The fusible plugs protect the main wheel against tire burst that could occur under heavy braking conditions.

19
Q

Which hydraulic system powers the inboard brakes?
Which hydraulic system powers the outboard brakes ?

A

Inboard- hydraulic system 3
Outboard - hydraulic system 2

20
Q

How is braking initiated?

A

By pressing the upper portion of the Rutter pedals which are mechanically linked to the associated brake control valves. The brake control valves meter hydraulic pressure, proportional to the pedal pressure, to the 4 main wheel brake units through 4 independent anti-skid control valves and 4 hydraulic fuses.

21
Q

What happens if a leak occurs in a brake line?

A

The associated hydraulic fuse will close off the hydraulic line, preventing loss of the entire system fluid.

22
Q

If you lose hydraulic systems 2 or 3, what will that do to the braking?

A

The airplane has 50% symmetric braking capability with full anti-skid control to the working brakes. In the event of a failure, both hydraulic systems 2 and 3 accumulators in each hydraulic system will provide reserve pressure for braking.

23
Q

How do the main wheels/NLG stop spinning during retraction?

A

Main wheels: hydraulic pressure is applied to the main wheel brake control valves to stop main wheel spin.
NLG: a rubber spin-down pad assembly in the NLG wheel well provides resistance to stop the nose wheel from spinning after gear retraction.

24
Q

When must the brake wear indicator pins be checked?

A

With the brakes applied and hydraulic systems 2 and 3 pressurized

25
Q

The antiskid system performs what 3 functions?

A
  1. Individual wheel anti-skid control: prevents skids from developing
  2. Touchdown protection: prevents landing with locked wheels in the event that the pilots are depressing the brake pedals during touchdown
  3. Locked wheel protection: allows a wheel to recover from a deep skid
26
Q

How do you restore manual braking during a braking loss failure?

A

By selecting the antiskid system OFF

27
Q

When is pressure removed/restored to the antiskid system?

A

In the air, with no weight-on-wheels signal, the antiskid control valves dump pressure to prevent wheel lock-up on touchdown.

The system becomes operational once a 35 knots wheel spin-up signal is present or a weight-on-wheels signal is present after a 5 second delay.

28
Q

How does the parking brake work?

A

Inboard brake control valves and the parking shut off valve are used to provide braking when the airplane is parked.
When the hydraulic systems are shut down, hydraulic pressure slowly leaks away via the anti-skid return lines.
The parking brake shut off valve closes when the parking brake is applied, ensuring that hydraulic system 3 accumulator pressure is maintained on the inboard brakes for a prolonged period of time.

29
Q

What happens if there is a brake unit overheat?

A

An aural warning sounds and a BRAKE OVHT warning message is displayed on the EICAS primary page if any of the brake units overheat.
If any of the sensors fail, the respective readout will turn to amber dashes.

30
Q

How many degrees is each unit of BTMS equivalent to?

A

Approximately 35°C or 95°F
0-6 GREEN
7-14 WHITE
15 or greater RED

31
Q

Inboard brake system is supplied by?
Outboard brake system supplied by?

A

3
2

32
Q

What fire detection is in the MLG bay?

A

A single loop overhead detection wire

33
Q

The ECU (electronic control unit) does what to the NLG after takeoff?

A

Generates a straight ahead command before retraction

34
Q

Steering ECU failure detected or hydraulic 3 failure reverse the NLG to what?

A

Shimmy-damping mode which allows free-castering of the nose wheel

35
Q

Steering ECU failure detected or hydraulic 3 failure reverse the NLG to what?

A

Shimmy-damping mode which allows free-castering of the nose wheel

36
Q

During flight if the tiller is moved what happens?

A

If the nosewheel steering tiller is moved more than 2 degrees, the STEERING INOP caution message may come on

PSA CA Upgrade (5 decks)

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