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* B777 CATHEY STUDY GUIDE COPY > LANDING GEAR > Flashcards

LANDING GEAR Flashcards

1
Q

How is main gear steering achived?

A

Main gear aft truck is steerable automatically. Operates when the nose wheel steering angle is over 13 deg to reduce tire scrubbing

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2
Q

Max speed for gear extension and retraction?

A

270 kts or M 0,82

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3
Q

How many tires does the B777 have?

A

14

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4
Q

Which HYD system is used for normal braking?

A

The right HYD system

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5
Q

Which HYD systems supplies the steering systems?

A

Center/RSV for the nose Wheel

Center for the main gear aft axle steering

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6
Q

What HYD system is used for alternate and reserve braking?

A

Centre HYD system

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7
Q

Is anti-skid available with the Center HYD system?

A

Yes

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8
Q

In which braking modes is anti-skid available?

A

Normal
Alternate
Reserve
Accumulator only

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9
Q

Where are the air/ground logic sensors located?

A

On each main landing gear beam

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10
Q

When is the lever lock normally released?

A

Once airborne

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11
Q

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

A

Because the system is automatically depressurized

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12
Q

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

A

By pushing and holding the landing gear lever LOCK OVERRIDE switch

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13
Q

What is the non normal format to display gear extension on EICAS?

A

EICAS displays the locked/transit status of each gear

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14
Q

How does the landing gear extend?

A

HYD pressure unlocks mechanical locks and then the gears free fall

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15
Q

How is the main gear locked down?

A

By downlocks hydraulically

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16
Q

How many braces are on each main landing gear?

A
  1. A drag brace and a side brace
17
Q

What type of pump is used for alternate gear extension?

A

A dedicated DC powered hydraulic pump using Center HYD system fluid

18
Q

How is alternate gear extension done?

A

Select down on ALT GEAR switch but first put the gear lever in the down position

19
Q

How are the gear doors affected by alternate gear extension?

A

All the hydraullically powered doors remain open

20
Q

Which HYD system Powers the nose gear steering?

A

Centre and Reserve system

21
Q

Is the nose steering system available with Centre/RSV hydraulics?

A

Yes

22
Q

What is the max steering angle with the tiller?

A

70 deg

23
Q

What is the max steering angle with rudder pedals?

A

7 deg

24
Q

Will the main gear operate with rudder pedal steering?

A

No, Operates over 13 deg. Pedals can only give 7 deg

25
Q

Which hydraulic system gives pressure for reserve braking?

A

The primary C1 pump

26
Q

What is indicated by the BRAKE SOURCE light and EICAS message?

A

Both Right and Center/RSV HYD pressure is low

27
Q

Which HYD system pressurizes the brake accumulator?

A

The right HYD system

28
Q

When is the brake accumulator charged hydraulically?

A

Stores pressure if Right HYD system pressure is lost

29
Q

When is anti-skid available?

A

With normal and alternate system. In all braking modes

30
Q

In regard to anti-skid, which Wheels are individually controlled?

A

The aft axle Wheels.

31
Q

In which braking modes is autobrake available?

A

Only in Normal mode

32
Q

When will autobrake function for a rejected T/O?

A

Over 85 kts. Both thrust levers must have been retarded to idle to engage. Arming of RTO is only possible on the ground

33
Q

Will autobrake bring the a/c to a complete stop?

A

Yes

34
Q

What does the EICAS msg AUTOBRAKE indicate?

A

The autobrake system has disarmed

35
Q

How is the Park brake set?

A

Depress both pedals, pull PB lever up, then release pedals

36
Q

What temp will display BRAKE TEMP message?

A

When any brake temå is at or above 5,0 (500 deg C)

37
Q

What 3 situations will cause the TIRE PRESSURE msg on the EICAS?

A
  1. Any tire press is above normal range
  2. Any tire press is below the normal range
  3. Excessive pressure diff between 2 tires on the same axle

* B777 CATHEY STUDY GUIDE COPY (21 decks)

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