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B-777 > Landing Gear > Flashcards

Landing Gear Flashcards

1
Q

The 322 incorporates a more robust main gear strut and truck than earlier 777

models as well as semi-levered gear.

The semi-levered gear consists of

A

a hydraulic actuator that connects the forward side of the main gear strut

to the gear truck.

The semi-levered gear has

locked, tilt and stow positions.

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2
Q

On take-off, the aircraft effectively rotates around

A

the aft wheel pairs as the hydraulic actuator locks the main gear truck.

This facilitates a greater Angle Of Attack and better take-off performance.

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3
Q

In flight with the wheels down and locked,

the hydraulic actuator positions

A

the main gear truck with

a wheels up tilt

to provide damping during touchdown.

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4
Q

The hydraulic actuator also positions the main gear truck to

A

a forward wheels down position

for retraction into the wheel wells.

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5
Q

he Boeing 777 is steered on the ground through

A

nose wheel and main gear aft axle steering.

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6
Q

Hydraulic power for the normal brake

hydraulic system is supplied by

A

the Right Hydraulic system.

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7
Q

The brake accumulator is pressurized by

A

the Right Hydraulic system.

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8
Q

In the normal brake system (and with accumulator braking),

each wheel has individual antiskid protection.

The alternate / reserve brake system only provides individual antiskid

A

to the aft axle wheels;

forward and middle axles are protected as wheel pairs.

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9
Q

The parking brake can be set with

A

normal or alternate brake system pressure.

If neither is available,

it can be set using brake accumulator pressure.

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10
Q

The normal range for the brake temperatures are

For values between 3 and 4.9,

the symbol for the hottest brake, on each main gear, becomes

A

between 0 and 4.9.

solid white.

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11
Q

Brake temperature values between 5.0 and 9.9 will be

A

shown in amber and

the solid amber box for any brake

indicates an overheat condition.

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12
Q

There are two weight-on-wheels landing sensors located

A

on each main landing gear beam.

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13
Q

The maximum airspeed for normal gear extension and retraction is

A

270 KIAS or Mach .82.

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14
Q

White crosshatches indicate

A closed door is indicated by

A

the door is not closed.

“CLOSED” boxed in white.

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15
Q

Once the uplocks are released,

A

the gear freefalls into the down and locked position

and the downlocks are

powered to the downlock position.

The hydraulically actuated gear doors close and the main gear tilt to the flight position.

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16
Q

Main gear aft axle steering automatically operates when

A

the nose gear steering angle exceeds 13 °.

The aft axles move up to 6.5 ° in each direction

reaching full deflection when the nose wheel reaches 70 °.

17
Q

This movement of the aft axles reduces

A

tire scrubbing and the turning radius of the aircraft.

18
Q

on dry runways, deceleration rate for MAX AUTO is

A

less than that produced by full manual pedal braking.

19
Q

With AUTOBRAKE 1 or 2 selected, brake application is

With 3, 4 or MAX AUTO selected, autobrakes are

A

delayed until slightly after touchdown.

applied immediately upon touchdown.

20
Q

Autobrakes disarm and the EICAS advisory message AUTOBRAKE is

displayed if:

A

pedal braking is applied,

either thrust lever is advanced after landing,

the speedbrake lever is moved to the DOWN detent,

disarm or OFF is selected,

an autobrake fault, or there is a normal antiskid system fault.

The Autobrakes disarm and the EICAS message also displays if there is loss of inertial data from the ADIRU,

or autobrakes are applied after loss of normal brake hydraulics.

21
Q

The RTO setting commands maximum braking pressure if:

A

the airplane is on the ground,

ground speed is above 85 kt and both thrust levers are retarded to idle.

If a Rejected Take-off (RTO) is initiated below 85 kt the RTO autobrake function does not operate.

22
Q

After take-off, the AUTOBRAKE selector automatically

A

disarms and moves to the OFF position.

23
Q

touchdown and hydroplaning protection is provided

A

using airplane inertial ground speed.

24
Q

If the gear lever is locked down after take-off,

there is a malfunction with the air / ground sensing system.

System inputs indicate (incorrectly)

A

that the aircraft is on the ground.

25
Q

The alternate gear extension system

uses a dedicated DC powered motor and fluid from

A

the Center Hydraulic system to extend the landing gear.

26
Q

Selecting the alternate gear switch releases all door and gear uplocks.

Like normal gear extension, the gear free falls to the down and locked position.

Landing gear lever position has

A

no effect on the alternate system.

27
Q

When the alternate gear system is used,

the EICAS changes to the expanded gear indication.

The advisory message “GEAR DOOR” will also display on the EICAS because

A

all gear doors remain in the open position.

28
Q

If either the drag brace or side brace is not locked after the normal gear transit

time, the EICAS caution message

A

“MAIN GEAR BRACE L” or “MAIN GEAR BRACE R” will be displayed.

29
Q

A white box indicates failure of any gear or door position indicator.

Failure of all gear position indicators is indicated

A

by a single white box on the EICAS.

30
Q

If the main gear aft axles are not centered when commanded to the center

position, the EICAS advisory message

A

“MAIN GEAR STEERING” will be displayed.

31
Q

If take-off thrust is applied without

the main gear aft axles centered and locked,

A

the take-off configuration aural alert will sound

and the EICAS warning

“CONFIG GEAR STEERING” will be displayed.

32
Q

If Right Hydraulic system pressure is low,

the Center / Reserve Hydraulic system

A

automatically supplies pressure to the alternate / reserve

brake hydraulic system via the alternate antiskid valves.

33
Q

In the event center system quantity is low,

the C1 hydraulic pump is isolated to

A

provide pressure to the alternate brakes.

It uses reserve fluid in the center reservoir

to provide reserve braking.

34
Q

Loss of the right and center / reserve hydraulic systems causes

A

the “BRAKE SOURCE”

light to illuminate

and the EICAS advisory message

“BRAKE SOURCE” to display.

35
Q

If right and center / reserve brake hydraulic power is lost,

A

the brake accumulator can

provide several braking applications

or parking brake application.

36
Q

The alternate / reserve brake hydraulic system

provides antiskid protection to tandem wheel pairs

for the forward and middle axle wheels.

The aft axle wheels

A

remain individually controlled.

37
Q

The EICAS advisory message “ANTISKID” is displayed if

A

an antiskid fault affecting the brake hydraulic system in use is detected,

or if the parking brake valve is not fully open with the parking brake released,

or if the system is completely inoperative.

38
Q

The EICAS advisory message “AUTOBRAKE” is displayed if

A

the autobrake system is disarmed or has failed.

39
Q

Brake temperature values of

A

5.0 and above are displayed in amber and

the EICAS advisory message “BRAKE TEMP” is displayed.

B-777 (32 decks)

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