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3_Avelo Air 737NG_Systems > 17_LANDING GEAR > Flashcards

17_LANDING GEAR Flashcards

1
Q

Hydraulic power for retraction, extension and NWS is normally supplied by:

A

Hyd Sys A

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2
Q

Normal brakes are normally powered by:

A

Hyd system B

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3
Q

Antiskid is provided for which braking systems?

A

Both the normal (sys b) and alternate (sys A)

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4
Q

Autobrakes are only provided by which system?

A

only with the Normal brake system (hyd B)

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5
Q

Alternate Brakes are normally powered by?

A

Hyd system A

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6
Q

What is the purpose of the Landing gear lever lock? Is there a difference on the ground or in the air? If so what?

A

Ground: prevents gear from moving to UP position.

Flight: air/ground system energizes a solenoid which opens the lever lock.

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7
Q

What does the override trigger do?

A

its used to bypass the landing gear lever lock.

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8
Q

What stops the main gear wheels during retraction?

A

Brakes automatically stop the rotation.

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9
Q

How are the main wheels held in place after retraction?

A

Mechanical Uplocks

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10
Q

Which direction does the nose wheel retract?

A

Forward

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11
Q

How are the nose wheels stopped during retraction?

A

By snubbers.

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12
Q

How is the nose gear held in place?

A

By an overcenter lock.

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13
Q

Which hyd system can alternately RAISE the landing gear and through what piece of equipment?

A

Hyd B through the landing gear transfer unit. It supplies volume of fluid to RAISE the gear at a NORMAL rate.

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14
Q

In order for Hyd B to raise the landing gear at a normal rate - what conditions are required?

A

All of the following are true:

  • in the air
  • LDG Gear lever positioned UP
  • EITHER main gear is NOT up and locked
  • No 1 engine RPM drops below a limit value [56% N2]. (because this is associated with Sys A - so its not available - afterthought fyi)
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15
Q

When the gear lever is moved DOWN what system powers the extension and what does it do?

A

Hyd A pressure releases the uplocks.

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16
Q

What holds the gear at full extension?

A

Overcenter mechanical and hydraulic locks.

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17
Q

If Hyd A is lost, what provides another means of LOWERING the gear?

A

the manual extension system

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18
Q

How does the manual gear release system work and what pulls the gear down?

A

manual gear releases - release the uplocks that allow the gear to free fall to down and locked using gravity and air loads.

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19
Q

Manual Extension Access Door Open Questions.

  1. can you manually extend the gear with the lever in any position?
  2. is normal gear extension possible? If so how?
  3. Can you retract the landing gear if the door is open?
A
  1. yes
  2. yes - if hyd A pressure is available
  3. No - gear RETRACTION is disabled.
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20
Q

What steps would be needed to retract the gear NORMALLY after a manual gear extension?

A
  1. close the access door
  2. move gear lever to DOWN with Hyd A available then move it UP.
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21
Q

When is the NWS available?

A

when the nose gear is in the DOWN position and compressed by the weight of the airplane.

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22
Q

What hyd system normally powers the NWS and when is it available?

A

Hyd A - positioning the gear lever to DOWN makes Sys A available to the steering metering valve.

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23
Q

What hyd system powers the ALT NWS and how is it activated?

A

System B - sys B provides pressure to the nose wheels when the Nose Wheel Steering switch is placed to ALT with normal B hyd qty and the airplane is ON THE GROUND.

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24
Q

What happens to the ALT NWS if (due to a leak downstream of the LG transfer unit) there is a loss of hyd sys B fluid (in the reservoir)?

A

a sensor closes the LG Transfer valve and ALT NWS will be LOST.

25
Q

When is rudder pedal steering deactivated?

A

When the nose gear strut extends.

26
Q

Which wheels have brakes?

A

Each MAIN gear wheel has multi-disc hyd powered brakes - the NOSE wheel has NO brakes

27
Q

What are the components to the brake system?

A

Normal Brakes

Alt Brakes

Parking Brake

Auto Brake

Anti-skid Protection

Brake Accumulator

28
Q

What hyd system powers the NORMAL brakes?

A

Hyd B

29
Q

What HYD system powers the ALT brakes?

A

SYS A.

30
Q

How are the ALT brakes activated and when?

A

if hyd B sys is low or fails - hyd A AUTOMATICALLY supplies pressure.

31
Q

What is the purpose of the brake accumulator?

A

if BOTH normal and alt brakes are lost, trapped hyd pressure can still provide several braking applications OR parking brake application.

32
Q

What provides pressure to the Brake Accumulator?

A

Hyd Sys B

33
Q

Antiskid protection is provided for which braking system?

A

Its provided for BOTH normal AND alternate brakes.

34
Q

Does the antiskid work any different between the NORMAL and ALT brake systems?

A

Normal: EACH main gear is individually protected

Alt: protection is only applied to MAIN gear wheel PAIRS (not individual)

35
Q

What kind of protection does the antiskid provide?

A

- SH*T - (memory aid - think of the l like an I)

SKID

HYDROPLANE

(LOCKED) WHEEL

TOUCHDOWN

36
Q

Is antiskid available with a loss of BOTH hydraulic systems?

A

Yes.

37
Q

What system powers the AUTOBRAKES and what do they do?

A

Hyd Sys B (ONLY) provide max decel for RTO and automatic braking at preselected decel RATES immediately after touchdown.

38
Q

Will the autobrakes work with Alt brakes?

A

No - autobrakes ONLY work when the NORMAL braking system is functioning.

39
Q

Is ANTI SKI provided during autobrake operation?

A

Yes.

40
Q

Can the RTO autobrake setting be selected in the air?

A

No - it can be selected ONLY on the ground.

41
Q

What happens after you select RTO on the switch?

A

the AUTO BRAKE DISARM light illuminates for about 1-2 seconds which indicates an auto self-test was successful.

42
Q

What conditions are required to ARM the RTO mode prior to takeoff?

A

All the following:

on the GROUND

both antiskid and autobrakes are operational

AUTOBRAKES switch to RTO

thrust levers - IDLE

wheel speeds LESS than 60 kts.

43
Q

When is the RTO mode active?

A

If RTO happens before 90 kts autobraking is NOT initiated - the AUTOBRAKE DISARM light does NOT illuminated and RTO remains armed.

If RTO initiated AFTER 90 kts, MAX braking is applied automatically when thrust levers - IDLE.

44
Q

When is RTO automatically disarmed?

A

when both Air/Ground systems indicate in the AIR.

(the AUTO BRAKE DISARM light does NOT illuminated and switch stays in RTO)

45
Q

How do you manually disarm or reset the autobrakes?

A

you position the selector to OFF.

46
Q

What happens if you land with RTO selected?

A

No autobraking will occur and the AUTO BRAKE DISARM light illuminates (2 seconds after touchdown).

47
Q

When does a turn on self test occur for the autobrake system and what does it show if its NOT successful?

A

It occurs when you select a landing autobrake selection - if NOT successful - the AUTO BRAKE DISARM light illuminates and does not arm.

48
Q

How many levels of decelaration are there?

A

4

49
Q

When do autobrake application begin after landing?

A

BOTH thrust levers IDLE

MAIN wheel spin up

50
Q

When is the latest (during landing) that you can select the autobrakes?

A

it may be selected after touchdown PRIOR to decelerating through 30 kts (gnd speed) - and braking begins immediately.

51
Q

Can you change deceleration levels during braking or will it disarm the system?

A

Yes - deceleration levels can be changed without disarming the system. And it will bring plane to complete stop (unless terminated by pilot)

52
Q

How can the pilots disarm the autobrake system?

Will the AUTOBRAKE DISARM light illuminate?

After braking has started, what actions disarms the autobrake system immediately (and illuminates AUTO BRAKE DISARM light)?

A
  1. By moving the selector switch to OFF
  2. Not by rotating switch to OFF
  3. Any of the following:
    a. SPEED BRAKE (to DOWN detent)
    b. advancing FWD thrust lever(s) - except during first 3 seconds after touchdown.
    c. applying MANUAL brakes.
53
Q

What hyd system can set the parking brake?

A

either A or B pressurized.

54
Q

If you do not have either HYD A or B is parking brake pressure maintained?

How?

A

Yes.

Parking brake pressure is maintained by the brake accumulator.

55
Q

If there is a FAULT in the parking brake system - what indication could that possibly give you?

A

it could cause the ANTISKID INOP light to illuminate

56
Q

How many sensor does the air/ground system receive and where are they located?

A

it receives it from 6 sensors (2 on each landing gear)

57
Q

AIR GROUND SYS LOGIC Questions.

  1. When are door flight locks engaged (air/ground)
  2. When will packs regulate to high flow (air/ground)
  3. When does RAM air fans operate. (air/ground)
  4. Wing AI switch (air/ground)
  5. Autothrottle operation (air/gnd)
  6. Speed brake lever actuation (air/gnd)
  7. Auto slat ops (air/gnd)
  8. FMC update (air/gnd)
  9. Standby Hyd (air/gnd)
  10. Antiskid ops.
  11. Autobrake Ops
  12. LGTU ops
  13. Stall Warning
A
  1. AIR: flt locks engaged - (either N2 > 50% AND 3 or more doors are closed) GND: same
  2. AIR: 1 pack ops - goes to HI FLOW (flaps up) GND: 1 pack ops - HI FLOW (flaps up)
  3. AIR: fans operate when packs operate GND: same BUT deflectors are extended
  4. Wing AI: AIR: Control valve OPEN (switch ON) - thrust setting and duct temp logic bypassed GND: with switch ON, valves cycle open and closed - trips OFF at lift off
  5. AT - AIR: enables Go-Around (below 2,000’ RA) GND: disengaged 2 seconds AFTER takeoff (takeoff mode enabled)
  6. Speedbrake - AIR: can be armed to raise spoilers for landing GND: activates SPEED BRAKE lever on landing if armed (RTO feature avail. Drives to DOWN when thrust levers advanced)
  7. Auto Slats - AIR: enabled (flaps 1, 2, or 5) PTU aval if SYS B pressure lost GND: system disabled
  8. FMC: AIR - position updates from GPS, DME or VOR/DME GND: position update from GPS
  9. STBY HYD: AIR - pump auto operates with flaps extended AND A or B pressure lost. GND - wheel speed MUST be > 60 kts for automatic operation.
  10. Antiskid: AIR - releases NORMAL or ALT brakes for touchdown protection GND - allows normal antiskid braking after wheel spin up
  11. Autobrakes: AIR - allows selection of ldg mode GND: RTO mode avail and ldg mode may be selected after touchdown if wheel speed is > 30 kts.
  12. LGTU: AIR - Enabled GND - Disabled
  13. Stall Wrng: AIR - Enabled GND - Disabled
58
Q

How does Hyd fluid return to SYS B after using it for the braking system?

A

the return fluid is delivered through the Parking Brake Valve.

3_Avelo Air 737NG_Systems (19 decks)

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