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B737 > Landing Gear > Flashcards

Landing Gear Flashcards

1
Q

what hydraulic system powers the landing gear extension and retraction

A

HYD SYS A

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2
Q

what hydraulic system powers the nose wheel steering:
- normal
- alternate

A
  • normal = HYD SYS A
  • alternate = HYD SYS B
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3
Q

what hydraulic system powers the brakes:
- normal
- alternate

A
  • normal = HYD SYS B
  • alternate = HYD SYS A
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4
Q

what alternate means exist for extending the landing gear

A

manual landing gear extension system (gravity)

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5
Q

what prevents the landing gear lever from being moved to the UP position

A

landing gear lever lock

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6
Q

what methods are used to stop the wheels spinning for retraction of the landing gear:
- main gear
- nose gear

A
  • main gear = brakes
  • nose gear = snubbers
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7
Q

what methods are used to hold the gear in the wheel well after retraction:
- main gear
- nose gear

A
  • main gear = mechanical uplocks
  • nose gear = over-center lock
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8
Q

what happens when the landing gear lever is placed in the ‘OFF’ position

A

cuts off hydraulic pressure to the landing gear system

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9
Q

what protection exists for the wheel well if a main gear is damaged and begins retracting

A

when a spinning tire with loose tread impacts a fitting in the wheel well ring opening, that gear stops retracting and free falls back to the down position. the affected gear cannot be retracted until the fitting is replaced

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10
Q

what is the purpose of the landing gear transfer unit

A

HYD SYS B provides the required volume of hydraulic fluid to retract the landing gear at the normal rate if:
- airborne
- engine 1 RPM below limit value
- landing gear lever = UP
- either main landing gear not up and locked

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11
Q

how is the landing gear normally extended

A

HYD SYS A releases uplocks, then falls with:
- hydraulic pressure
- gravity
- air loads

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12
Q

what maintains the landing gear in the down locked position

A
  • over-center mechanical and hydraulic locks
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13
Q

what happens when the manual extension access panel is open

A
  • manual gear extension is possible with the landing gear lever in any position
  • normal landing gear extension is possible if HYD SYS A pressure is still available
  • landing gear retraction is disabled
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14
Q

following a manual gear extension, what steps need to be taken in order to complete a normal retraction of the landing gear

A
  • close manual gear extension access panel
  • move landing gear lever to down with HYD SYS A pressure available
  • position landing gear lever to UP
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15
Q

when is the nose wheel steering available

A
  • nose gear in the down position
  • nose gear compressed by aircraft weight
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16
Q

what happens in the event of a hydraulic leak being detected downstream of the LGTU (Landing Gear Transfer Unit)

A

sensor closes the Landing Gear Transfer Valve and alternate steering will be lost

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17
Q

what controls the nose wheel steering

A
  • nose wheel steering wheel (capt side only)
  • rudder pedals (limited)
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18
Q

when is the rudder pedal steering deactivated

A

nose gear strut extends

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19
Q

what does the lockout pin do

A

depressurizes the nose wheel steering allowing pushback

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20
Q

what is the brake system made up of

A
  • normal brakes
  • alternate brakes
  • brake accumulator
  • anti-skid
  • autobrake
  • parking brake
  • brake temperature indication
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21
Q

when does the alternate braking system takeover from the normal braking system

A

when HYD SYS B is low or fails, HYD SYS A automatically takes over

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22
Q

what system is the brake accumulator pressurised from

A

HYD SYS B

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23
Q

by what system is braking pressure still available if HYD SYS A + B is lost

A

accumulator pressure can provide several braking applications or parking brake applications

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24
Q

when is antiskid available

A

at all times

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25
Q

what is the difference in the way the anti-skid operates with:
- normal braking
- alternate braking

A
  • normal braking = provides each individual wheel with anti-skid protection
  • alternate braking = provides each pair of gear with anti-skid protection
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26
Q

what types of protection does the anti-skid system provide

A
  • skid
  • locked wheel
  • touchdown
  • hydroplane
27
Q

under what HYD SYS does the autobrake only operate

A
  • normal = HYD SYS B
28
Q

when can RTO be selected

A

only on the ground

29
Q

what happens upon RTO selection

A

“AUTO BRAKE DISARM” LIGHT illuminates for 1 to 2 seconds and then extinguishes (successful automatic self-test)

30
Q

what conditions must exist in order to arm RTO for takeoff

A
  • on ground
  • antiskid and autobrake operative
  • AUTO BRAKE select switch = RTO
  • wheel speed < 60kt
  • TL = IDLE
31
Q

what happens to the system during a reject with RTO selected: (below and above xx speed)

A

below 90kt:
- no autobrake
- “AUTO BRAKE DISARM” light does not illuminate
- RTO remains armed
above 90kt:
- maximum braking is applied automatically if TL = IDLE

32
Q

automatic disarming of the RTO mode (how and indications)

A

how:
- both air/ground systems indicate air mode
indications:
- “AUTO BRAKE DISARM” light does not illuminate
- AUTO BRAKE selector remains in RTO position

33
Q

how is manual disarming of the RTO mode achieved

A

selecting auto brake selector to OFF

34
Q

what happens if landing is made with RTO selected (AUTOBRAKE select switch not cycled back to OFF)

A
  • no autobrake action
  • “AUTO BRAKE DISARM” light illuminates 2 seconds after landing
35
Q

what happens when the turn-on self test fails (selection of autobrake for landing)

A

-“AUTO BRAKE DISARM” light illuminates
- autobrake does not arm

36
Q

what produces the maximum deceleration on a dry runway

A

max brake pedal deflection

37
Q

when does autobrake action happen during landing

A
  • both TL idle
  • main wheel spin-up
38
Q

can the autobrake system be used to a complete stop

39
Q

how is the autobrake normally disarmed after braking action has started (indication)

A
  • speed brake lever - down detent
  • advancing TL (except for the first 3 seconds after touchdown)
  • applying manual brakes
    “AUTO BRAKE DISARM” light illuminates
40
Q

what other method is available to disarm the autobrake apart from the normal method(indication)

A
  • autobrake selector - OFF
  • NO “AUTO BRAKE DISARM” light illumination
41
Q

which HYD SYS are used to set the parking brake

A
  • HYD SYS A or B
42
Q

how is the parking brake maintained if the SYS HYD A and B are not pressurized

A

brake accumulator

43
Q

how is the parking brake set

A
  • depressing the brake pedals fully
  • pulling the park brake lever up
44
Q

how is the parking brake released

A
  • pressing the brake pedals until the park brake lever releases
45
Q

what indications may be caused by a fault in the parking brake system

A

“ANTISKID INOP” light illumination

46
Q

VLO retraction

47
Q

VLO extension

A

270 kts/ 0.82M

48
Q

VLE

A

320 kts/ 0.82M

49
Q

landing gear indicator lights (red/ top):
- illuminated
- extinguished

A

illuminated:
- gear not down and locked (either or both TL idle & < 800’ AGL)
- disagreement of selector and position (transit or unsafe)
extinguished:
- up and locked with lever UP/OFF
- down and locked with lever DN

50
Q

landing gear indicator lights (bottom/green):
- illuminated
- extinguished

A

illuminated:
- gear down and locked
extinguished:
- gear not down and locked

51
Q

landing gear lever:
- UP
- OFF
- DN

A
  • UP = retraction
  • OFF = hydraulic pressure removed from the landing gear system
  • DN - extension
52
Q

manual extension access door:
- OPEN
- CLOSED

A

OPEN:
- manual landing gear extension is possible with the landing gear lever in any position
- normal landing gear extension is still possible if HYD SYS A pressure is available
- landing gear retraction is disabled
CLOSED:
- landing gear operate normally

53
Q

manual gear extension handles

A

unlocks the landing gear uplocks when related handle is pulled to its limit (approx 61cm)

54
Q

“AUTO BRAKE DISARM” light:
- illuminated
- extinguished

A

illuminated:
- SPEED BRAKE lever moved to down detent
- manual brakes applied
- TL advanced (except during first 3s after touchdown)
- landing made with RTO selected
- RTO mode selected on the ground (illuminates for 1 or 2 seconds then extinguishes)
- malfunction in the autobrake system
extinguished:
- AUTO BRAKE select switch to OFF
- autobrake armed

55
Q

AUTO BRAKE select switch:
- OFF
- 1,2,3, MAX
- RTO

A

OFF = autobrake system deactivated
1, 2, 3, MAX:
- selectes desired deceleration rate for landing
- switch must be pulled out to select MAX
RTO = automatically applies maximum brake pressure when TL are idle and above 90kt

56
Q

“ANTISKID INOP” light
- illuminated
- extinguished

A
  • illuminated = a system fault is detected by antiskid monitoring system
  • extinguished = antiskid system operating normally
57
Q

hydraulic brake pressure indicator:
- normal pressure
- maximum pressure
- normal precharge pressure

A
  • normal = 3000psi
  • maximum = 3500 psi
  • normal precharge = 1000psi
58
Q

“BRAKE TEMP” light:
- illuminated
- extinguished

A

illuminated:
- 1 or more brake temperatures > 4.9
extinguished:
- hot brake condition no longer indicated on DU

59
Q

brake temperature:
- what does indication mean
- value range
- white
- amber

A
  • relative wheel brake temperature value
  • 0 - 9.9
  • white = normal range (0 to 4.9)
  • amber = high brake temperature (> 4.9)
60
Q

brake symbol:
- blank
- solid white
- solid amber

A
  • blank = brake < 2.5
  • solid white = hottest brake on each main gear truck 2.5 to 4.9
  • solid amber = brake overheat condition on eah wheel 5.0 to 9.9 (remains until value < 3.5)
61
Q

rudder pedal at full deflection = how much nose wheel deflection

62
Q

nose wheel steering switch:
- NORM
- ALT

A
  • NORM = HYD SYS A powers NWS
  • ALT = HYD SYS B powers NWS
63
Q

nose wheel steering wheel at full deflection = how much nose wheel deflection (what happens to rudder pedal input effect on nose wheel deflection)

A

78 degrees and cancels rudder pedal input

B737 (10 decks)

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