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B777 Landing Gear > Landing Gear > Flashcards

Landing Gear Flashcards

Landing Gear

1
Q

How is main gear steering achieved?

A

Using C hydraulic system (main gear aft axle steering automatically operates when nose wheel steering angle exceeds 13o –> reduces tire scrubbing).

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2
Q

Which hydraulic system is used for gear retraction and steering?

A

• Nose gear: C/reserve hydraulic systems • Main gear: C hydraulic system.

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3
Q

What hydraulic system is used for normal braking?

A

R hydraulic system.

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4
Q

What hydraulic system is used for alternate and reserve braking?

A

C hydraulic system (if R system pressure low).

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5
Q

In which braking modes is anti-­‐skid available?

A

All modes

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6
Q

Where are the air/ground sensors located?

A

Sensors located on each main gear LDG beam.

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7
Q

How can the ground landing gear lever lock be manually overridden?

A

By pushing and holding the LDG gear lever LOCK OVERRIDE switch.

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8
Q

Why is there no OFF selection for the landing gear lever?

A

LDG gear system is automatically depressurized W/ the LDG gear retracted and all doors closed.

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9
Q

What is the non-­‐normal format for gear indication?

A

Expanded (non-­‐normal) gear position indication (format)

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10
Q

How does the landing gear extend?

A

Gear doors open –> gear is unlocked –> gear free–falls to locked position –> all hydraulically actuated doors close –> main gear hydraulically tilted to the FLT position.

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11
Q

How many braces are on each main landing gear?

A

2 (drag brace & side brace).

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12
Q

What type of pump is used for alternate gear extension?

A

(Dedicated) DC electric hydraulic pump.

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13
Q

How are the gear doors affected by an alternate gear extension?

A

Hydraulically powered gear doors remain open.

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14
Q

Which hydraulic system powers the nose steering system?

A

C/reserve hydraulic system.

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15
Q

What is the steering authority for the tiller operation?

A

70 degrees either direction.

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16
Q

What is the steering authority for the rudder pedal operation?

A

7 degrees either direction

17
Q

When will main gear steering operate?

A

When nose wheel angle exceeds 13o (to reduce tire scrubbing).

18
Q

Which hydraulic pump provides pressure for reserve braking?

A

Primary C1 pump.

19
Q

When will the BRAKE SOURCE light and EICAS message be displayed?

A

Loss of the R & C/reserve hydraulic systems.

20
Q

Which hydraulic system pressurises the brake accumulator?

A

R hydraulic system.

21
Q

Is anti-­‐skid available when using only the brake accumulator pressure?

A

Yes

22
Q

How is anti-­‐skid protection achieved in alternate/reserve braking?

A

Antiskid protection provided to tandem wheel pairs for FWD & middle axis but individually for aft axle wheels.

23
Q

When is autobrake available?

A

Only when normal brake system is functioning.

24
Q

At what speed is RTO braking available?

A

Speed > 85kts.

25
Q

How does the taxi brake system reduce braking sensitivity?

A

Antiskid system releases the brakes of one axle pair of each main LDG gear (if wheels speeds < 45kts).

26
Q

Will autobrake bring the aircraft to a complete stop?

A

Yes.

27
Q

What does the EICAS AUTOBRAKE message indicate?

A

Autobrake is disarmed intentionally or is inoperative.

28
Q

How is the park brake set?

A

By depressing the brake pedals and pulling park brake lever on, then releasing the pedals (park brake can be set W/ normal or ALTN brake system pressurised, or if not pressurised, pressure maintained by the brake accumulator).

29
Q

When will the BRAKE TEMP message be displayed?

A

Values > 5.0.

30
Q

What 3 situations will cause the EICAS TIRE PRESSURE message?

A

• Any tire pressure ABV normal range. • Any tire pressure BLW normal range. • Any excessive pressure differences between two tires on same axle.

B777 Landing Gear (1 decks)

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