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NR > Landing Gear System > Flashcards

Landing Gear System Flashcards

1
Q

MLG Shock Strut

A

2 stage nitrogen/oil strut that absobs the majority of force associated with landing

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2
Q

MLG Drag Strut/Actuator

A

Attached to MLG shock strut and extends and locks the gear for landings and retracts the gear in flight

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3
Q

MLG drag strut/actuator lock pin

A

Inserted by the ground crew at the junction of the actuator and shock strut to lock the gear in extended position when the aircraft is on the ground

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4
Q

Where are the MLG Gear Position switches located

A

mounted on the upper and lower section of the drag strut/actuator

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5
Q

What provides brake power

A

No. 3 hydraulic pump

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6
Q

what provides back-up brake power

A

electric motor hydraulic pump and an accumulator. The pump continuously recharges the accumulator

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7
Q

Pressure of Back up Brake System

A

2,000 psi

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8
Q

Capability of the Back up brake system

A

capable of holding the aircraft on a 10 deg slope at max alternate gross weight of 60,500 lbs

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9
Q

In the event of a leak in the flight control portion of the Hydraulic No. 3 the Back up brake system is capable of providing ___

A

a minimum of 5 brake applications within a 15 minute time frame after engagement of the system if the leak occurred within 1.25 hours of system engagement

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10
Q

NLG Drag Strut/Actuator

A

Attached to the shock strut and the aircraft frame, and is hydraulically powered to extend and lock the gear and to retract the gear

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11
Q

NLG Ground Lock Safety Pin Assembly

A

Prevents accidental retraction on the ground. Attached to the cable assembly that runs to the drag strut/actuator lock pin lever

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12
Q

Nose Hike Nitrogen Chamber

A

Used to raise the nose 15 inches to facilitate shipboard towing within the hangar deck.

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13
Q

NLG Out of Range switch

A

Mounted on the power steering collar to disable the steering commands if steering angle exceeds 75 degrees from center

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14
Q

What provides power for the Power Steering System

A

Hydraulic System No. 3

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15
Q

Nosewheel Steering (NWS) 3 modes of operation

A
  1. Power Steering2. Nosewheel Lock3. Full Swivel (Power Steering Off)
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16
Q

What must occur for power steering to be activated

A

both main gear or nose gear is weight on wheels, 20 sec have elapsed, and no steering failures exist

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17
Q

Nosewheel steering displacement

A

70 degrees

18
Q

Max airspeed for gear extension or retraction

A

140 KCAS

19
Q

Max airspeed with gear extension

A

150 KCAS

20
Q

Max VTOL/CONV mode touchdown rate

A

720 fpm for gross weight less than 46,000 lbs and 600 fpm for gross weight greater than 46,000 lbs

21
Q

When is the landing gear warning low altitude mode armed

A

when the gear is retracted, nacelles are greater than 70 degrees, and aircraft exceed 500 ft/min rate of climb

22
Q

When is the landing gear warning triggered in low altitude mode

A

If rate of climb drops below 200 ft/min for 3 sec below 240 ft AGL.

23
Q

When is the landing gear warning high altitude mode armed

A

Above 240 ft AGL or nacelles lower than 70 degrees

24
Q

When is the landing gear warning triggered in high altitude mode

A

When aircraft descends below 200 ft AGL, nacelles are greater than 70 degrees, and the gear is not down and locked

25
Q

Which electrical bus provides power for gear extension and retraction controls and gear position indicators

A

No. 1 DC Bus

26
Q

Static ground wires

A

mounted between the two wheels on each Landing Gear Shock Strut to discharge the aircraft’s static electricity

27
Q

What happens when both pilots apply brake pressure simultaneously

A

The system responds only to the pilot applying the higher pressure

28
Q

When is backup break power used most often

A

For spotting on the ship or hangar decks when the APU is not running

29
Q

The electric motor for the backup brake is powered by which bus

A

The unswitched battery bus, so failure to turn it off can cause the battery to drain

30
Q

Where is the Emergency Extension Nitrogen Bottle and Gauge located

A

In the aft right sponson

31
Q

When might an abnormal retraction be necessary

A
  1. The control handle down lock solenoid fails to release the mechanical lock 2. there is a WOW switch failureIn either case use the DOWN LOCK ORIDE
32
Q

Landing gear handle position for emergency extension

A

Emergency extension takes place regardless of the gear handle position

33
Q

What triggers LG DN A/S EXCEEDED Caution

A

Landing gear is down and the airspeed exceeds 140 KCAS

34
Q

Procedure for LG DN A/S EXCEEDED Caution

A

If 150 KCAS is exceeded:1. Landing Gear - Remain Down2. Land as soon as practical

35
Q

What triggers NOSEWHL NOT CNTRD Caution

A

One of the following conditions occurred during gear retraction:1. Nosewheel not centered2. Nosewheel position is unknown and the nosewheel actuator failed3. There is an actuator fault

36
Q

Procedure for NOSEWHL NOT CNTRD Caution

A

CAUTION: Do not attempt to raise the gear. If gear retraction is attempted without the nosewheel centered, major structural damage may occur.1. PFCS - ResetIf caution does not clear2. Land as soon as practical, vertical landing recommended

37
Q

What triggers NOSEWHL STEER FAIL Caution

A

Nosewheel steering actuator has failed or nosewheel is beyond 75 degrees from center

38
Q

What triggers LAND GEAR ABORT Advisory

A

Landing gear has not successfully completed an up or down transition cycle within 30 +/-5 seconds

39
Q

What triggers LANDING GEAR FAULT Advisory

A

The Landing Gear Control Unit has detected a BIT fault or the Landing Gear Control Solenoid Valve has failed overspeed caution and gear up warning tone may be inoperative. Or Landing gear has lost down lock. Hydraulic pressure is now continuously provided to landing gear actuators.

40
Q

Procedure for LAND GEAR ABORT Advisory or LANDING GEAR FAULT Advisory

A
  1. Attempt to operate gear normallyIf unsafe gear indications 2. Landing Gear Fails to Extend - Execute
41
Q

Procedure for LANDING GEAR FAULT Advisory if cause is lost down lock.

A

If landing gear is relocked1. Landing normallyIf landing gear fails to relock2. Landing gear fails to retract/extend - Execute

42
Q

What triggers WOW DISAGREE Advisory

A

WOW switches disagree for more than 15 seconds

NR (20 decks)

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