Landing Gear Flashcards

1
Q

How is the gear held up?

A

Mechanical uplocks

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2
Q

How are the landing gear bay doors opened?

A

Mechanically

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3
Q

How is the gear held down?

A

Downlock springs

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4
Q

What are the 3 ways to extend the gear?

A
  • Normal - via gear handle
  • Electrical override - electrical signal bypasses the PSEM
  • Alternate - residual hydraulic pressure releases uplocks and gear free falls
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5
Q

What must you do to get 3 green indication using the alternate gear extension?

A

Place the gear handle in the down position

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6
Q

If the down/uplock sensors disagree, which one will be considered valid?

A

The one that agrees with the landing gear lever position

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7
Q

Which hydraulic system provides pressure to the outboard brakes?

A

Hydraulic system 1

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8
Q

Which hydraulic system provides pressure to the inboard brakes?

A

Hydraulic system 2

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9
Q

If both hydraulic systems fail, is there a way to stop the airplane?

A

Yes, via the emergency parking brake

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10
Q

What are some functions of the brake control modules (BCM)?

A
  • Locked wheel protection
  • Anti-skid protection
  • Automatic wheel braking
  • Touchdown protection
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11
Q

When is locked wheel protection active?

A

Above 30 kts

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12
Q

When is anti-skid deactivated?

A

Below 10 kts

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13
Q

When is anti-skid not available?

A

For the emergency parking brake system

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14
Q

What prevents the main landing gear from being retracted with the wheels spinning?

A

Automatic wheel braking

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15
Q

What is touchdown protection?

A

Prevents the airplane from touching down with the main landing gear brakes applied

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16
Q

When is touchdown protection deactivated?

A
  • 3 seconds after WOW has sensed the ground or

* Wheel speed above 50 kts

17
Q

What supplies the emergency/parking brake?

A

Hydraulic system 1 and 2

18
Q

Where are the pressure accumulators for the emergency/parking brake system?

A

Isolated from both normal hydraulic systems

19
Q

How many brake applications are available from the accumulators?

A

6 full brake applications

20
Q

What supplies the nose wheel steering?

A

Hydraulic system 2

21
Q

Handwheel steering angle

A
  • 76° until 40 kts

* Decreases to 7° at 100 kts

22
Q

What is the maximum rudder pedal steering angle

23
Q

When is free wheel steering automatically activated?

A
  • Air/ground system failure occurs
  • Steering angle > 76°
  • Steering system failure
24
Q

What are the two ways to disconnect the free wheel steering?

A
  • Disconnect switch on yokes

* Disconnect switch on the external power connection

25
How many weight on wheels (WOW) sensors are there?
* 6 total | * 2 on each wheel
26
When will you get a green towing light?
* Steering disengaged * Parking brakes not applied * Main brakes not applied
27
How many downlock/uplock sensors are installed?
* 12 sensors total | * 2 uplocks and 2 downlocks per landing gear
28
When will the gear warning sound and can not be silenced?
•Flaps 5 or full regardless of thrust lever or radio altimeter Flaps 0 thru 4 •RA below 700 ft AGL and •Either thrust lever below 45° for 2 engines •Thrust lever below 59° for 1 engine
29
In the event of a dual radio altimeter failure when will the inhibit button silence the aural warning?
Only when flaps are between 0-4 positions
30
How are the brakes operated?
Brake by wire
31
Describe the landing gear indications
* Green - down and locked * White - up and locked * Amber - in transit * Red - gear position and lever disagree