Landing Gear/Brakes Flashcards

1
Q

What is a PSEU?

A

Proximity Sensing Electronic Unit

-sensors and switches that measure physical relationship between two components to provide a “far” or “near” signal

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2
Q

How many proximity sensors on each landing gear? WOW?

A
  1. 2 as well.
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3
Q

What holds up the nose landing gear up and down in the 200? 7/900?

A

200:

Up: Mechanical Uplock
Down: Overcenter Locking Mechanism

7/900:

Up-Overcenter mechanism
Down-Overcenter mechanism

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4
Q

How is the main landing gear held up on all 3 airplanes?

A

Mechanical Uplocks

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5
Q

What locks the gear down on the 200? 7/900?

A

200: Locking mechanisms in the MLG side strut actuators

7/900: Locking mechanisms in the MLG side stays

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6
Q

What prevents the gear from being retracted on the ground?

A

Solenoid Lock

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7
Q

Force required for manual gear extension?

A

40lbs.

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8
Q

NWS deflection on the 200? 7/900?

A

200: 70 degrees

7/900: 80 degrees

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9
Q

Turning radius on 200/7/900?

A

2/700: 75ft

900: 80ft

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10
Q

What hydraulic system powers the onboard brakes? Outboard?

A

Inboard: 3
Outboard: 2

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11
Q

How do the wheels stop moving on gear retraction?

A

Hydraulic pressure from the landing gear selector valve is directed to the brake control valves to stop MAIN WHEEL rotation

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12
Q

Failure of Hydraulic system 2/3, what provided brake pressure for landing and how many landings with anti skid off?

A

Accumulators provide pressure for 6 brake applications but loss of system 2/3 results in 50% reduction in braking capability

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13
Q

When does anti-skid become operational?

A

35kt or higher wheel spin up OR weight on wheels signal plus 5 second delay

**System is functional down to a minimum wheel speed of 10 knots

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14
Q

What charts are used for BTMS INOP cooling times?

A
  1. Max quick turnaround weight (performance cards)
  2. TLR/Speed Cards
  3. V1MBE Charts (QRH Vol 1, Perf-04)
  4. V1/V1MBE Ratio Chart (QRH Vol 1, Perf-04)
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15
Q

What are the 5 steps to determining brake cooling times?

A
  1. Determine Max Quick Turnaround Weight (MQTAW)
  2. Determine V1 for next takeoff (Higher of 2)
  3. Determine V1MBE for next takeoff
  4. Calculate V1/V1MBE ratio
    - ex: V1=147, V1MBE=171, 147/171=.89
  5. Determine Brake cooling times
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16
Q

Which hydraulic system powers NWS?

A

System 3

17
Q

Which hydraulic system powers the main gear auxiliary actuators during a manual gear extension?

A

System 2