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Landing Gear Flashcards

(63 cards)

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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
what is the difference in the way the anti-skid operates with: - normal braking - alternate braking
- normal braking = provides each individual wheel with anti-skid protection - alternate braking = provides each pair of gear with anti-skid protection
26
what types of protection does the anti-skid system provide
- skid - locked wheel - touchdown - hydroplane
27
under what HYD SYS does the autobrake only operate
- normal = HYD SYS B
28
when can RTO be selected
only on the ground
29
what happens upon RTO selection
"AUTO BRAKE DISARM" LIGHT illuminates for 1 to 2 seconds and then extinguishes (successful automatic self-test)
30
what conditions must exist in order to arm RTO for takeoff
- on ground - antiskid and autobrake operative - AUTO BRAKE select switch = RTO - wheel speed < 60kt - TL = IDLE
31
what happens to the system during a reject with RTO selected: (below and above xx speed)
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
automatic disarming of the RTO mode (how and indications)
how: - both air/ground systems indicate air mode indications: - "AUTO BRAKE DISARM" light does not illuminate - AUTO BRAKE selector remains in RTO position
33
how is manual disarming of the RTO mode achieved
selecting auto brake selector to OFF
34
what happens if landing is made with RTO selected (AUTOBRAKE select switch not cycled back to OFF)
- no autobrake action - "AUTO BRAKE DISARM" light illuminates 2 seconds after landing
35
what happens when the turn-on self test fails (selection of autobrake for landing)
-"AUTO BRAKE DISARM" light illuminates - autobrake does not arm
36
what produces the maximum deceleration on a dry runway
max brake pedal deflection
37
when does autobrake action happen during landing
- both TL idle - main wheel spin-up
38
can the autobrake system be used to a complete stop
YES
39
how is the autobrake normally disarmed after braking action has started (indication)
- speed brake lever - down detent - advancing TL (except for the first 3 seconds after touchdown) - applying manual brakes "AUTO BRAKE DISARM" light illuminates
40
what other method is available to disarm the autobrake apart from the normal method(indication)
- autobrake selector - OFF - NO "AUTO BRAKE DISARM" light illumination
41
which HYD SYS are used to set the parking brake
- HYD SYS A or B
42
how is the parking brake maintained if the SYS HYD A and B are not pressurized
brake accumulator
43
how is the parking brake set
- depressing the brake pedals fully - pulling the park brake lever up
44
how is the parking brake released
- pressing the brake pedals until the park brake lever releases
45
what indications may be caused by a fault in the parking brake system
"ANTISKID INOP" light illumination
46
VLO retraction
235 kts
47
VLO extension
270 kts/ 0.82M
48
VLE
320 kts/ 0.82M
49
landing gear indicator lights (red/ top): - illuminated - extinguished
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
landing gear indicator lights (bottom/green): - illuminated - extinguished
illuminated: - gear down and locked extinguished: - gear not down and locked
51
landing gear lever: - UP - OFF - DN
- UP = retraction - OFF = hydraulic pressure removed from the landing gear system - DN - extension
52
manual extension access door: - OPEN - CLOSED
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
manual gear extension handles
unlocks the landing gear uplocks when related handle is pulled to its limit (approx 61cm)
54
"AUTO BRAKE DISARM" light: - illuminated - extinguished
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
AUTO BRAKE select switch: - OFF - 1,2,3, MAX - RTO
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
"ANTISKID INOP" light - illuminated - extinguished
- illuminated = a system fault is detected by antiskid monitoring system - extinguished = antiskid system operating normally
57
hydraulic brake pressure indicator: - normal pressure - maximum pressure - normal precharge pressure
- normal = 3000psi - maximum = 3500 psi - normal precharge = 1000psi
58
"BRAKE TEMP" light: - illuminated - extinguished
illuminated: - 1 or more brake temperatures > 4.9 extinguished: - hot brake condition no longer indicated on DU
59
brake temperature: - what does indication mean - value range - white - amber
- relative wheel brake temperature value - 0 - 9.9 - white = normal range (0 to 4.9) - amber = high brake temperature (> 4.9)
60
brake symbol: - blank - solid white - solid amber
- 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
rudder pedal at full deflection = how much nose wheel deflection
7 degrees
62
nose wheel steering switch: - NORM - ALT
- NORM = HYD SYS A powers NWS - ALT = HYD SYS B powers NWS
63
nose wheel steering wheel at full deflection = how much nose wheel deflection (what happens to rudder pedal input effect on nose wheel deflection)
78 degrees and cancels rudder pedal input

B737 (10 decks)

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