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G650 > Landing Gear & Brakes > Flashcards

Landing Gear & Brakes Flashcards

1
Q

How is the landing gear controlled on the G650?

A

The fully retractable, tricycle type, landing gear system is electrically controlled, hydraulically actuated, and electrically sequenced.

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2
Q

What does the red light (or white for EASA) indicate in the gear handle?

A

Disagreement between the landing gear handle and the gear

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3
Q

What’s the meaning of a magenta gear indication on the flight control synoptic page?

A

Gear in transit

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4
Q

How are gear failures depicted on the flight control synoptic page?

A

Amber

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5
Q

What functions are performed from the Landing Gear Control Maintenance Panel (LGCMP)?

A

Used to change WOW status, retract or extend the gear when jacked, and open/close the gear doors. In maintenance mode, gear handle input is ignored.

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6
Q

What’s normally accomplished after moving the gear handle to UP after takeoff?

A

Selection of ground spoilers to OFF: it’s the only step of the gear UP flow pattern

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7
Q

What’s the purpose of the landing gear LOCK RELEASE button?

A

It allows the landing gear handle to be placed in UP position regardless of WOW mode or electrical power

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8
Q

What’s the normal source of hydraulics for opening and closing the gear doors on the ground?

A

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

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9
Q

What’s the caution associated with the gear doors once they’re opened for preflight?

A

Always pin the doors open when movement is not desired: in addition, don’t remove pins with left hydraulic pressure applied (i.e. left engine driven pump, PTU, or aux)

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10
Q

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

A

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

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11
Q

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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12
Q

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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13
Q

What happens to uplocks when left hydraulic system pressure is applied during gear retraction?

A

They move to the correct position

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14
Q

What happens if an uplock is found in the wrong position during the preflight and aux pump pressure is applied?

A

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

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15
Q

What happens if you takeoff with the nose and main gear downlock safety pins installed?

A

These pins prevent accidental gear retraction and are designed to withstand full hydraulic system retraction pressure. If you takeoff with pins installed, the gear will not come up.

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16
Q

What should nose wheel strut extension be during pre-flight?

A

2 to 9 inches

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17
Q

What’s the purpose of disconnecting the torque link from NWS unit during towing?

A

It ensures the NWS unit will not be damaged by over travel. With steering unit torque links disconnected, nose wheels are free to rotate 360°

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18
Q

Describe the WOW system.

A

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

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19
Q

When is a klaxon tone generated to warn the flight crew of unsafe conditions?

A

Either power lever at idle, flaps <22° and any landing gear not down and locked at <350’ AGL (radio altitude) OR engine power levers at any setting, flaps >22° and any gear not down and locked.

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20
Q

How can the warning horn be silenced if flap position is >22° and the gear is retracted?

A

By either retracting the flaps or extending the landing gear

21
Q

How many landing gear dump valves are there?

A

Two: one for the nose and one for the mains

22
Q

After performing an emergency extension, a blue DUMP legend illuminates inside both DUMP VALVE switches. What does this indicate?

A

It illuminates when respective dump valves have been activated (i.e. moved from the hydraulic to pneumatic position)

23
Q

What happens when you depress either DUMP VALVE switch?

A

An electrical solenoid resets the respective dump valve for hydraulic operation and the DUMP legend extinguishes

24
Q

What happens with selection of the FDR / CMC EVENT switch?

A

It places an event stamp on FDR tape, initiates CMC time series recording, and switch legend illuminates blue

25
Q

Describe what happens when the EMER LDG GEAR handle is pulled?

A

The emergency air release valve opens and releases compressed nitrogen into the landing gear extension system

26
Q

What happens when the EMER LDG GEAR handle is returned to the stowed position?

A

Nitrogen pressure is released from the actuators and exhausted overboard through a vent on the right side of the nose wheel well adjacent to the NLG doors

27
Q

What’s the position of the landing gear doors following an emergency extension?

A

Open

28
Q

Describe sources of hydraulics for normal braking.

A

The inboard brakes are powered by hydraulics from the left system, PTU or aux system. Without a source of hydraulics, the inboard accumulator is available for use through the toe brakes as well as the PARK BRAKE handle. The outboard brakes are powered by hydraulics from the right hydraulic system. Without a source of hydraulics, the outboard accumulator is available for use through the toe brakes as well as the PARK BRAKE handle.

29
Q

Describe the sources of hydraulics for the parking brake system.

A

The parking brake uses pressure from the 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 the left and right hydraulic systems. Important note: if you select the AUX pump to ON during ground operations without the engines running, only the left (inboard) parking brake accumulator is charged.

30
Q

At approximately what brake pedal deflection does braking begin?

A

The shutoff valve opens with a brake pedal >8% and deenergizes <6%

31
Q

What happens if both pilots are providing brake input?

A

The greater input wins

32
Q

What’s the purpose of brake fuses?

A

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

33
Q

Each MLG wheel has a 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 the landing gear

34
Q

When the parking brake handle is set, what component ensures the pressure coming from outboard accumulator is equal to or slightly less than pressure coming from the inboard accumulator?

A

The repeater valve

35
Q

Fully charged accumulators should provide how many applications with the parking brake or toe brakes?

A

Approximately five (5) to six (6)

36
Q

How is brake life determined during the preflight?

A

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

37
Q

How does the G650’s basic antiskid work?

A

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

38
Q

Below what speed is antiskid protection no longer available?

A

10 knots

39
Q

How does touchdown protection work?

A

Zero brake pressure is applied until five (5) seconds after WOW shifts to ground mode or wheel speed spins up >70 knots.

40
Q

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

41
Q

What accumulator pressure would you expect to see once the accumulators are fully charged?

A

Full pressure is approximately 3000 psi (2800 psi ± 200 for OUTBD and 3000 psi ±100 for INBD)

42
Q

What does Gulfstream recommend to hold the aircraft for extended periods of time?

A

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

43
Q

While performing the TAKEOFF INIT on the FMS, you notice that the ENABLED legend under BTMS is highlighted. What does that mean?

A

The FMS is not able to perform brake temperature monitoring computations.

44
Q

What’s the source of hydraulics for NWS?

A

Left hydraulic system: if left system pressure is not available, the PTU can provide system pressure, or aux hydraulic pump can pressurize the system once the aircraft is on the ground with weight-on-wheels.

45
Q

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

46
Q

What happens when PEDAL STEERING switch is selected to OFF?

A

Rudder pedal steering is disabled

47
Q

What does a NWS popped overtravel indicator indicate?

A

That steering unit has been forced beyond the normal travel range and maintenance is required

48
Q

What’s the purpose of variable gain in the nose wheel steering system?

A

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

G650 (20 decks)

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