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Contour > Landing Gear and Brakes > Flashcards

Landing Gear and Brakes Flashcards

1
Q

How are the landing gear extension/retraction and braking functions powered and controlled?

A

Hydraulically assisted and electronically controlled and monitored

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2
Q

Which hydraulic system powers landing gear retraction and extension?

A

No 1 hydraulic system

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3
Q

How should the landing gear be lowered if the No.1 engine fails?

A

Using the normal landing gear handle

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4
Q

How should the landing gear be lowered if the No.1 hydraulic system fails?

A

Using the free fall handle

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5
Q

Where is the landing gear position indicated?

A

Primarily on the EICAS, but also on either RMU

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6
Q

What system backups are available in the event of normal extension failure?

A

The electric override serves as the primary extension backup, and the free fall system serves as a secondary backup

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7
Q

How many proximity switches does the landing gear use to detect when the aircraft is on the ground?

A

Four. The nose gear proximity switch is not used by the landing gear

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8
Q

Which system use the nose landing gear weight on weight signal?

A

Thrust reversers and nosewheel steering

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9
Q

How are the nose landing gear doors kept closed when the landing gear is fully retracted?

A

Hydraulic pressure

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9
Q

If any gear uplock is found in the up position during a pre flight walkaround, how can it be reset?

A

By activating the landing gear free fall lever

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10
Q

What color is the EICAS landing gear position indicator when the landing gear is in transit?

A

Yellow and black cross hatched

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11
Q

If the landing gear is not in the selected position after 20 sec, what color is the EICAS display?

A

Red and black cross hatched

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12
Q

Under what conditions is the landing gear warning message generated when the gear is not locked down?

A
  • RA below 1,200 ft flaps set below 22 degrees, one thrust lever below 59 degrees and the other below 45 degrees
  • Flaps set at 45 degrees
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13
Q

What does the brake control unit do as soon as the aircraft is airborne and the gear is selected up?

A

Automatically applies brake pressure to the main gear wheels

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14
Q

How are the nose gear tires braked upon gear retraction?

A

Mechanically, via stops located in the nosewheel well

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15
Q

What are the three levels of protection provided by the anti skid system?

A

-Touchdown protection
-Locked wheel protection
-Anti Skid protection

15
Q

How does the anti skid function operate?

A

It releases brake pressure on the wheel it senses is rotating slower

15
Q

At what speed is anti skid available?

A

Wheel speed above 10kt during deceleration

16
Q

At what speed is locked wheel protection available?

A

Above 30 kt

17
Q

What does touchdown protection do?

A

It inhibits brake actuation before the main wheels have accelerated. Braking is inhibited until 3 sec after landing or the wheels have spun up to at least 50 kt

18
Q

Which hydraulic system powers the emergency/parking brake?

A

The No.2 system

19
Q

How many complete emergency brake actuators or hours of parking brake actuation can be relied on from the No.2 system accumulator?

A

Six emergency brake actuations or 24 hour of parking brake

20
Q

Are any of the brake protection systems available when using the emergency brake?

A

No

21
Q

How is the nosewheel steering system controlled and operated?

A

It is electronically controlled and hydraulically operated

21
Q

What are the two ways of disconnecting the nosewheel steering?

A

Either by a switch on the back side of either pilot’s control wheel or by an external steering disengagement switch in a compartment on the left front of the fuselage. This external switch cannot be reset from inside the aircraft

22
Q

Which indication is provided to the pilots that the steering is disconnected?

A

STEER INOP caution message on the EICAS

23
Q

What safeguard is provided to preclude an inadvertent gear retraction command while on the ground?

A

The air-ground system provides a signal to a solenoid inside the landing gear lever which places a mechanical stop over it

24
Q

The nosewheel steering system is operating by which hydraulic system?

A

No. 1

25
Q

Where are the brake temperatures shown?

A

On the MFD hydraulic page

26
Q

What is the limit of nosewheel steering provided by the rudder pedals?

A

5 degrees. A position sensor set to 7 degrees disengages the system if the nosewheel is rotated above this limit by using the rudder pedals

27
Q

What is the meaning of the BRAKE DEGRADED EICAS message?

A

It indicates a total or partial loss of braking capability of one outboard wheel and/or one inboard wheel, or internal BCU failure

27
Q

How many seperate hydraulic systems power the brakes?

A

The brakes are powered by two independent hydraulic systems

Contour (17 decks)

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