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Bombardier Challenger 350 > Landing Gear and Brakes > Flashcards

Landing Gear and Brakes Flashcards

1
Q

What hydraulic system powers normal extension and retraction of the landing gear?

A

Left hydraulic system

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2
Q

What system controls and monitors the position of the landing gear?

A

PSEU - Proximity Sensing Electronic Unit

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3
Q

What locks the main gear into the down position?

A

Internal segmented downlocking mechanism inside the actuator

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4
Q

What holds the gear in the up position?

A

Mechanical uplocks hold the gear in the up-and-locked position

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5
Q

How is the nose gear centered on retraction?

A

The steering control unit (SCU) electronically centers the nose gear

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6
Q

What locks the nose gear in the down position?

A

A spring-operated external lock mechanism on the drag brace mechanically locks the nose gear in the down position

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7
Q

The PSEU monitors what items on the aircraft? (4)

A
  • Landing gear
  • Aircraft doors
  • Thrust levers
  • Spoiler position
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8
Q

How many proximity sensors are on the landing and nose gear?

A

Dual sensors on each main gear and dual sensors on the nose landing gear

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9
Q

A GEAR DISAGREE caution will occur when what three things exist?

A
  • Any gear in transit for more than 28 seconds
  • Position of at least one gear does not agree with the gear
    control lever except during normal transit
  • Landing gear handle left in up position during manual
    extension
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10
Q

The gear and flaps display is removed from the primary page _______ seconds after the flaps are retracted and the gear is up?

A

30 seconds

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11
Q

The Aural GEAR is nonmutable if the following conditions occur … (3)

A
  • Any gear not down and locked and
  • Radio altimeter valid with a reading less than 500’ and
  • Left and Right Thrust Levers less than 26 degrees thrust
    lever angle or flaps greater than/equal to 27 degrees
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12
Q

The Aural GEAR is mutable if … (5)

A
  • Any gear is not down and locked and
  • Radio altimeter invalid and
  • Left and Right Thrust Levers less than 26 degrees thrust
    lever angle and
  • Altitude is less than 15,000’
  • Various airspeed and flaps conditions exist
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13
Q

What is indicated if a Magenta symbol is displayed?

A

Data from the PSEU is not available or is invalid

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14
Q

How many downlock sensors of the two must agree for a downlocked safe condition to exist?

A

One

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15
Q

What must occur to get a valid gear up indication

A

The uplock sensor must detect gear up and both downlock sensors must detect gear not downlocked

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16
Q

The brake control unit commands a brake pressure of ______ for _______ seconds during retraction to ensure main wheels have stopped spinning as they enter the bay?

A

350 psi for 4 seconds

17
Q

What is installed to slow the retraction of the nose landing gear?

A

A restrictor in the up hydraulic line for smoother retraction and less noise

18
Q

During a manual release, what assists in the extension of the main landing gear?

A

Auxiliary extend actuators

19
Q

What assists the nose gear in extending during a manual release?

A

Gravity and spring forces

20
Q

During a manual extension, the manual selector valve admits pressure from __________ to both auxiliary extend actuators to assist the main landing gear into downlock?

A

The right hydraulic system supported by an accumulator

21
Q

After a landing following an actual gear failure, what must occur?

A

The manual release handle should be stowed only after the gear pins have been installed

22
Q

What is the maximum speed for the tires?

A

182 knots

23
Q

What does each channel of the brake control system actually control?

A

One channel controls braking and antiskid operation for the inboard wheels while the second channel controls the outboard wheels

24
Q

What conditions must the brake control system detect to apply hydraulic pressure on landing?

A

Either left or right WOW input from proximity sensors for more than 5 seconds or
Wheel spin-up greater than 50 knots

25
Q

The brake control unit monitors wheel speed transducers to provide anti-skid protection down to ______ knots?

A

10 knots

26
Q

The BCU also uses wheel speed transducers to provide outputs for __________ and __________ deployment?

A
  • Spoiler and
  • Thrust Reverser
27
Q

The shutoff valves will remove hydraulic pressure to the BCU valves to disarm the BCU during flight when … ? (3)

A
  • Weight-off-wheel on both main landing gears and
  • Landing gear handle is up and
  • Wheel speeds and velocity equal zero
28
Q

The brake accumulator provides pressure to __________ ?

A

The outboard brakes

29
Q

The brake accumulator receives pressure from what hydraulic system?

A

Right hydraulic

30
Q

The emergency/parking brake meters hydraulic system pressure to what brakes?

A

All four main wheel brakes

31
Q

The emergency/parking brake receives pressure from what hydraulic system?

A

Left hydraulic

32
Q

Anti-skid BCU comparison is between what wheels?

A

The wheels on the same gear assembly and
Between each wheel on the same brake system (outboard or inboard) L inboard to R inboard and L outboard to R outboard

33
Q

NWS is operable when what conditions are met (5) ?

A
  • Left hydraulic system pressurized
  • Nose gear down and locked
  • Nose gear in a WOW condition
  • NWS selected ON
  • No faults detected by the SCU
34
Q

Full authority of the NWS left and right is … ?

A

65 degrees

35
Q

Rudder pedal command nosewheel steering up to … ?

A

7 degrees

36
Q

With the torque link attached, the gear can only be rotated _______ in either direction?

A

120 degrees

37
Q

With the torque links disconnected, how much chrome is necessary to be showing for towing at any angle?

A

3.5 inches of chrome visible

Bombardier Challenger 350 (14 decks)

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