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self study > Landing Gear > Flashcards

Landing Gear Flashcards

1
Q

Which hydraulic system does landing gear extension and retraction primarily use?

A

Hydraulic #A

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2
Q

Which hydraulic system does nosewheel steering primarily use?

A

Hydraulic #A

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3
Q

Which hydraulic system do the brakes primarily use?

A

Hydraulic #B

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4
Q

Is anti skid protection available when using the altenate brake system?

A

Yes

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5
Q

Are autobrakes available when using the alternate brake systems?

A

No

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6
Q

Describe landing gear extension

A

-#A releases the uplocks,
-Hyd pressure, gravity and airloads allow the gear to extend
-Gear locks with over centre mechanical and hydraulic locks

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7
Q

Describe the manual gear extension system

A

Manual handle in the flight deck releases the uplocks, allowing the gear to free fall into the locked position

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8
Q

What type of uplocks hold the gear in the retracted position?

A

Hydraulic uplocks - main gear
Over centre lock - nose gear

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9
Q

What prevents a damaged tyre causing damage to the wheel well?

A

Loose tread from the tyre will touch a fitting.

This will send a signal to extend the gear again.

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10
Q

When is hydraulic pressure removed from the landing gear?

A

When the landing gear lever is moved to the off position?

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11
Q

When does the landing gear transfer unit activate?

A

A irborne
N umber 1 engine RPM below certain value
U ndercarriage lever up
L anding gear down or not locked

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12
Q

What do green landing gear indicator lights mean?

A

Landing gear is down and locked

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13
Q

What does it indicate if the landing gear indicator lights are extinguished?

A

Landing gear is not down and locked

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14
Q

If the landing gear is not extended, when do the landing gear lights illuminate red?

A

When the aircraft descends through 800 feet AGL and either thrust lever reduced to idle

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15
Q

During normal operations, when do the landing gear lights illuminate red?

A

Gear in transit or unsafe

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16
Q

Refer Nose wheel steering switch:

With switch set to ALT, what does this do?

A

Switches to alternate nosewheel steering provided by hyd #B

17
Q

If a leak occurs downstream of the landing gear transfer unit, what will happen?

A

Sensor will cause landing gear transfer valve to close to prevent draining Hyd #B. Alt NW steering U/A.

18
Q

What is the range of the nosewheel with the tiller?

A

+/- 78 degrees

19
Q

What is the range of the nosewheel with the rudder pedal?

A

+/- 7 degrees

20
Q

What holds the towing lever in place?

A

Lockout pin

21
Q

How is the accumulator pressurised?

A

Hyd System #B pressurises the accumulator

22
Q

Under what conditions will the accumulator supply pressure?

A

Failure of both normal and alternate braking systems

23
Q

What is the normal brake accumulator pressure?

A

3000PSI

24
Q

What braking applications will the accumulator provide?

A

Several braking applications or park brake application

25
Q

What is the maximum brake accumulator pressure?

A

3500PSI

26
Q

What is the difference between the anti skid on normal vs alternate brake systems?

A

Anti skid protection is provided for each individual wheel with the normal brake system.

Anti skid protection using the alternate brake system is provided only for wheel pairs.

27
Q

What does an illuminated “Anti skid inop” light mean?

A

A system fault has been detected by the anti skid monitoring system

28
Q

Which hydraulic system powers the autobrakes?

A

Hyd #B

29
Q

What are the conditions for RTO autobrake selection?

A

Aircraft on the ground

Anti skid and autobrake systems operational

Wheel speed <60knots

Thrust levers Idle

Autobrake set to RTO

30
Q

If the take off is rejected at 85 knots with autobrake set to RTO, will the autobrake activate?

A

No,

Autobrake disarm light will not illuminate and autobrake will remain armed.

31
Q

If the take off is rejected at 110 knots with the autobrake set to RTO, will the autobrake activate?

A

Yes,

it will activate once thrust levers are retarded to idle.

32
Q

When does the autobrake disarm if it was set to RTO?

A

Once both air ground switches indicate airborne. Autobrake disarm annunciator will not illuminate and switch will remain in RTO.

33
Q

If the autobrake was left in RTO after take off and not disarmed prior to landing, what will happen?

A

No automatic brake pressure will be applied and autobrake disarm annunciator light will illuminate after 2 seconds.

34
Q

What landing modes of autobrake are available?

A

1, 2, 3, MAX

35
Q

When does autobrake application start?

A

Both thrust levers idle and main wheel spin up

36
Q

What will cause autobraking to disarm after landing? (4 ways)

A

Manual brake pressure

Speed brake lever to down detent

Advancing thrust levers

Autobrake switch off

37
Q

What are the 6 times auto brake disarm light will come on?

A

Flight spoilers selected down after RTO or landing

Manual braking applied after RTO or landing

Thrust levers moved forward from idle after RTO or landing

Landed with the autobrake set to RTO

Automatically for 2 seconds after selecting RTO on the ground

A fault exists in the autobrake system

38
Q

How many air ground sensors are on the B737 and where are they located?

A

6 total - 2 per landing gear

self study (12 decks)

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