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Study Guide > Landing Gear & Brakes > Flashcards

Landing Gear & Brakes Flashcards

1
Q
  1. How is landing gear controlled?
A

Electrically controlled, hydraulically actuated, and electrically sequenced.

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2
Q
  1. What does the white light indicate in gear handle?
A

Disagreement between landing gear handle and the gear.

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3
Q
  1. What’s the meaning of white gear indication on flight control synoptic page?
A

Gear in transit.

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4
Q
  1. What functions are performed from Landing Gear Control Maintenance Panel (LGCMP)?
A

Used to open/close gear doors, retract or extend the gear when jacked, and change WOW status.

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5
Q
  1. What’s the purpose of the landing gear LOCK RELEASE button?
A

It allows landing gear handle to be placed in UP position regardless of WOW mode.

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6
Q
  1. What’s the normal source of hydraulics for opening and closing gear doors on the ground?
A

Aux pump (in the absence of hydraulic pressure from left system) through LGCMP.

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7
Q
  1. What’s the caution associated with gear doors once they’re opened for preflight?
A

Always pin the doors open when movement is not desired.

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8
Q
  1. After opening the gear doors for preflight, what must be accomplished to put the airplane back into “ready for flight mode?”
A

Close all gear doors and select Normal on LGCMP; otherwise, plane will remain in MX mode and gear will not retract on departure.

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9
Q
  1. What’s the location of the nitrogen bottles used for emergency landing gear extension?
A

There are two (2) bottles: one located on each side of the nose wheel well.

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10
Q
  1. What’s the pressure on a fully serviced emergency landing gear extension bottle?
A

3,000 psi at 70°F/21°C; enough for only one extension of landing gear.

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11
Q
  1. What happens to uplocks when left hydraulic system pressure is applied during gear retraction?
A

They move to correct position.

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12
Q
  1. What happens if an uplock is found in wrong position during preflight and aux pump pressure is applied?
A

The hook snaps to correct position: there’s no preflight requirement to make sure they’re open.

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13
Q
  1. What happens if you takeoff with nose and main gear downlock safety pins installed?
A

Gear will not retract.

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14
Q
  1. What’s the purpose of disconnecting torque link from NWS unit during towing?
A

It prevents damage to NWS unit from over travel. With steering unit torque links disconnected, nose wheels are free to rotate 360°.

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15
Q
  1. Describe WOW system.
A

Two proximity sensors are installed on each landing gear and provide WOW indications.

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16
Q
  1. How many landing gear dump valves are there?
A

Two: one for nose and one for mains.

17
Q
  1. After performing an emergency extension, Nose Gear and Main Gear illuminates in blue inside Dump Valve switches. What does this indicate?
A

Dump valve movement from hydraulic to pneumatic position.

18
Q
  1. What happens when Dump Valve switches are pressed?
A

Dump valves are electrically placed in hydraulic position and blue switch labels change to white.

19
Q
  1. Describe what happens when EMER LDG GEAR handle is pulled?
A

Emergency air release valve opens and releases compressed nitrogen into landing gear extension system.

20
Q
  1. What happens when EMER LDG GEAR handle is returned to stowed position?
A

Nitrogen pressure releases from actuators and exhausts overboard through vent on right side of nose wheel well adjacent to NLG doors.

21
Q
  1. What’s the position of landing gear doors following an emergency extension?
A

Open

22
Q
  1. Describe sources of hydraulics for normal braking.
A

Inboard brakes are powered by hydraulics from left system, PTU or aux system. Without source of hydraulics, inboard accumulator is available for use through toe brakes as well as parking brake. Outboard brakes are powered by hydraulics from right hydraulic system. Without source of hydraulics, outboard accumulator is available for use through toe brakes as well as parking brake.

23
Q
  1. Describe sources of hydraulics for parking brake.
A

Parking brake uses pressure from left and right hydraulic systems (i.e., left system for inboard and right system for outboard). In the absence of left or right system pressure, it uses accumulator pressure which is charged from left and right hydraulic systems. Important note: if you select AUX pump to ON during ground operations without engines running, only the left (inboard) parking brake accumulator is charged.

24
Q
  1. What happens if both pilots are providing brake input?
A

Greater input wins

25
Q
  1. With RTO enabled for takeoff, when would you get anti-skid limited braking during an abort?
A

> 80 knots

26
Q
  1. What’s the purpose of brake fuses?
A

They shut off applied brake fluid in case of line rupture and fluid loss downstream.

27
Q
  1. Each MLG wheel has dedicated brake assembly which functions as normal toe brakes and parking brakes. What other functions do they perform?
A

Provides main wheel de-spin during retraction of landing gear.

28
Q
  1. When parking brake is set, what component ensures the pressure coming from outboard accumulator is equal to or slightly less than pressure coming from inboard accumulator?
A

Repeater valve

29
Q
  1. How is brake life determined during preflight?
A

“Life remaining” is determined by wear pin indicator (2 per brake assembly) attached to the end of stator. The amount of protrusion indicates the amount of life remaining in heat stack (parking brake must be set for proper indication).

30
Q
  1. How does basic antiskid work?
A

It’s accomplished by comparing individual wheel deceleration rates to predetermined ideal reference deceleration.

31
Q
  1. Below what speed is antiskid protection not available?
A

10 knots

32
Q
  1. How does touchdown protection work?
A

Zero brake pressure is applied until wheel speed > 70 knots or WOW plus five (5) seconds.

33
Q
  1. Why is brake pressure applied during gear extension and retraction?
A

During gear extension to check system health and during retraction to control rate of wheel spin down.

34
Q
  1. What does Gulfstream recommend to hold the aircraft for extended periods of time?
A

Always chock the aircraft: parking brake is not designed to hold aircraft for extended periods of time.

35
Q
  1. What happens if nose wheel steering power is selected to OFF?
A

Nose wheel is free to caster in passive mode, responding to tracking forces of differential braking or engine power settings.

36
Q
  1. What happens when pedal steering switch is selected to OFF?
A

Rudder pedal steering is disabled.

37
Q
  1. What does a NWS popped overtravel indicator indicate?
A

That steering unit was forced beyond normal travel range and maintenance is required.

38
Q
  1. What’s the purpose of variable gain?
A

It helps to prevent the pilot from over controlling the nose wheel steering.

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