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Dash Tech > Landing Gear And Hydraulics > Flashcards

Landing Gear And Hydraulics Flashcards

1
Q

How many Hydraulic systems are there?

A

2

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2
Q

What is the minimum dispatch quantity for hydraulic fluid in each system?

A

1=1.5Quarts

2=3Quarts

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3
Q

What powers the main hydraulic pumps?

A

The RGB

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4
Q

What Items are powered by the Number 2 system?

A 
LDG gear
Outboard spoilers
Nosewheel Steering
Emerg brake
Rudder actuator (upper)
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5
Q

What items are powered by the Number 1 hydraulic system?

A 
Flaps
Antiskid (toe brakes)
Inboard spoilers
Rudder actuator (lower)
PTU
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6
Q

Loss of fluid in what system would affect landing distance the most?

A

No1

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7
Q

What are the 2 ways to turn on the STBY hydraulic pumps?

A

Select flap, maunually using the switch

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8
Q

What powers the SPU’s?

A

L/R VAC buses in opposite. number 2 system will auto switch to R VAC if L fails.

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9
Q

What is the normal pressure of the Hydraulic pumps

A

3000PSI

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10
Q

What is the normal pressure of SPU’s?

A

2900PSI

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11
Q

What could bring on ENG HYD PUMP?

A

loss of pressure (less than 2000PSI) or fluid. I.e. leak or pump failure

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12
Q

What is the main purpose of the PTU?

A

Assist the #2 SPU with gear retraction and to prevent the ARPS system activating

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13
Q

When will the PTU automatically turn on?

A

Eng oil pressure below 40psi (eng fail) AND gear is retracting.

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14
Q

Can the PTU help if the #2 system has lost all fluid?

A

No

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15
Q

What powers the Hydraulic quantity gauges?

A

26V FAC

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16
Q

With a total loss of both hydraulic systems, what hydraulic actuator will still be operating? How will you know that it is still operating?

A

2 STBY pressure with no main system pressure.

Upper rudder actuator (#2 system)
via ARPS

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17
Q

What colour is our hydraulic fluid and what is it called?

A

SKYDROL, purple

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18
Q

How can we transfer fluid between reserviours?

A

normally not possible but there is a procedure on the back of the Air NSN AIP

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19
Q

HYD FLUID HOT

A

fluid over 109degC, no actions

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20
Q

1/2 HYD PUMP

A

System pressure below 2000PSI. could be a leak or fluid loss.

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21
Q

Main pump output rate

A

9.5Gal/min

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22
Q

SPU output rate

A

1.5Gal/min

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23
Q

No. 2 SPU AUX PWR

A

Powered by R VAC bus (same side, is normally powered by L VAC)

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24
Q

What bus powers the number 2 SPU?

A

LVAC

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25
Q

when will the #2 SPU be on automatically?

A

Less than 2000PSI pressure in main system + Weight off wheels

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26
Q

1/2 SPU hot

A

Overheat of SPU (no auto off)

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27
Q

What pressure does the PTU run at

A

2750PSI

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28
Q

PTU flow rate

A

4.5USG/min

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29
Q

where is the PTU on signal sent from?

A

a pressure switch on the number 2 side

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30
Q

What failsafes/cutoffs does the system have?

A

T handle valve (pull fuel off handle) in feed line to main pump, a pressure relief valve in the line before the filter, and the alternate gear release door

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31
Q

What power sources does the ARPS system need to funtion?

A

18PSI bleed air, #2 SPU (L or R VAC bus)

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32
Q

What does ARPS stand for?

A

Alternate rudder power supply

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33
Q

When does the RSOV activate?

A

system pressure below ~30PSI (activated by 18PSI air)

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34
Q

How is the Landing gear controlled and operated?

A

Electronically controlled through the selection lever, hydraulically controlled

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35
Q

How can we test the LDG gear lights?

A

Advisory lights test

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36
Q

What do the Amber lights on the Gear panel indicate?

A

Gear doors open

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37
Q

If an amber gear door light is on after extension or retraction what are the considerations?

A

Not above 140 kts, Could be the mechanical sequencing valve, or a proximity sensor failure (ask FA to check)

38
Q

Which hydraulic system does the gear run off

39
Q

If there was a loss of hydraulic fluid from the #2 hydraulic system, how would you extend the landing gear?

A

Alternate gear extension QRH

40
Q

What component monitors the position of up locks, downlocks and gear door positions?

41
Q

What component ensures that the gear cannot fully extend or retract unless the gear doors are open?

A

Mechanical sequencing valve

42
Q

LDG GEAR INOP

A

Sequence valve failure - doors inop (QRH)

43
Q

What does the gear inhibit switch do?

A

isolates the extend signal from the gear position selector

44
Q

What does opening the alternate gear release door above the F/O do?

A

Releases pressure in the system back into the reserviours

45
Q

After an alternate gear extension is nose wheel steering available?

A

No (run off same line as gear, which has now had all pressure removed)

46
Q

When should the alternate gear indication lights be used?

A

alt gear extn or any abnormal indication, QRH

47
Q

What conditions bring on the gear warning horn

A
  1. P/L’s near FI, below 130kts, gear not down
  2. P/L’s below 50%, flap 15 or more, auto feather not armed
  3. One P/L FI, less than 130kts, auto fx not armed. (can be muted on a SE app.)
48
Q

How many WOW sensors are there?

A

6 (2 on each gear)

49
Q

How is the gear down locked?

A

Main gear is locked down by a horizontal over center strut and springs.
Nose gear by a vertical over center drag strut.

50
Q

Which hydraulic system powers the Nose wheel steering?

51
Q

What is the max steering angle at high speeds using the NWS

A

7deg (connected to rudders at high speed)

52
Q

What is the max steering angle at low speeds using the NWS

53
Q

NOSE STEERING

A

ECU failure
More than 60deg nose angle
Nosewheel steering off

54
Q

At what speed (on T/O) does anti skid become available?

55
Q

When does Anti skid become available on LDG?

A

Wheel speed more than 35kts and WOW switch, or 3 secs after touchdown.

56
Q

How long is the antiskid test?

A

6secs GND

3secs AIR

57
Q

Can antiskid be tested with the gear up?

58
Q

Vlo?

59
Q

Vle?

60
Q

Max speed for alt gear extn

A

140 (doors unsecured - no hydraulic pressure)

61
Q

After T/O what could cause the gear not to retract?

A

Gear pin, total fluid loss number 2 system, Hydraulic #2 pump failure and a PTU failure, Leaving the alt gear extn door open (overhead=all gear, floor=mains only), PSEU or mechanical sequencing valve failures

62
Q

What direction does the main gear extend in?

A

Forward into the airflow

63
Q

What direction does the nose gear extend in?

A

Rearwards with the airflow

64
Q

Where is the lever to manually pressurise the park brake?

A

RH rear engine nacelle

65
Q

Does the gear have up locks?

A

Yes. main gear has physical uplocks (u shape), nose gear is held in place by over center lock bothup and down)

66
Q

What powers the gear selector switch?

67
Q

What does a red light mean on the gear selector panel and what do we do?

A

Gear unsafe or proxy sensor failure. QRH

68
Q

Will the gear still retract with the gear inhibit switch on?

A

Yes, only inhibits the down selection

69
Q

How many proxy sensors are there on the AC total?

70
Q

If a green light is on (regardless of other lights) what does this mean?

A

gear is safe

71
Q

How can we open the Landing gear bypass valve?

A

ALT gear extn cover on F/O roof (mechanical link)

72
Q

How do the alternate verification lights work?

A

Infrared beams through holes to recievers only when the gear is down and locked.

73
Q

ALT GEAR IND FAIL

A

Alternate gear extn in flight verification has identified a fault and has disabled a sensor. Turning on alternate verification lights will show you which one has failed (no light)

74
Q

When do you use the alternate gear extn

A

when the QRH says to

75
Q

If the gear does not lock down after alternate gear extension how can we complete the extension?

A

Using the manual hydraulic pump handle in the alternate gear floor panel and the handle behind the FO’s seat. This operates an independant hydraulic system and actuator.

76
Q

Where is the reserviour for the alternate gear extension

A

In the nose (1.25Q)

77
Q

What would it mean if there is a squelchy sound coming from the nose after take off when the gear is selected up?

A

main hydraulic system is in hydraulic lock, pushing against the alt gear release. CLOSE THE ROOF DOOR.

78
Q

What would happen if a wheel fell off?

A

Nothing, only require one per side

79
Q

What fills the tyres

80
Q

Can you take off with a tyre that has no tread grooves but isnt showing canvas?

A

Yes but advise engineers

81
Q

Which System controls the Emergency brake?

82
Q

What is the minimum pressure for the park brake before engine start

83
Q

where is the external park brake pressure indicator located?

A

RH wing root fairing

84
Q

Below what pressure does the external gauge read inaccurately?

A

1000PSI (nitrogen pressure)

85
Q

How many applications does the park brake accumulator allow for?

86
Q

When is the NWS active?

A

WOW plus Ldg gear down.

87
Q

TOUCHED RWY

A

Tailstrike

88
Q

WT ON WHEELS

A

a WOW sensor has failed

89
Q

how can we pressurise the park brake with the engines off?

A

manually by a pump in the RH eng nacelle

90
Q

when will the anti skid self test?

A

when its turned on + gear down

91
Q

below what speed is the anti skid unavailable?

92
Q

When is the anti skid activated on landing?

A

wheel speed over 35kts +wow or 3 secs after touchdown.

Dash Tech (20 decks)

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