Landing Gear/Brakes

Question 1

What is a PSEU?

Answer 1

Proximity Sensing Electronic Unit

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

Question 2

How many proximity sensors on each landing gear? WOW?

Answer 2

2. 2 as well.

Question 3

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

Answer 3

200:

Up: Mechanical Uplock
Down: Overcenter Locking Mechanism

7/900:

Up-Overcenter mechanism
Down-Overcenter mechanism

Question 4

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

Answer 4

Mechanical Uplocks

Question 5

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

Answer 5

200: Locking mechanisms in the MLG side strut actuators

7/900: Locking mechanisms in the MLG side stays

Question 6

What prevents the gear from being retracted on the ground?

Answer 6

Solenoid Lock

Question 7

Force required for manual gear extension?

Answer 7

40lbs.

Question 8

NWS deflection on the 200? 7/900?

Answer 8

200: 70 degrees

7/900: 80 degrees

Question 9

Turning radius on 200/7/900?

Answer 9

2/700: 75ft

900: 80ft

Question 10

What hydraulic system powers the onboard brakes? Outboard?

Answer 10

Inboard: 3
Outboard: 2

Question 11

How do the wheels stop moving on gear retraction?

Answer 11

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

Question 12

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

Answer 12

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

Question 13

When does anti-skid become operational?

Answer 13

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

Question 14

What charts are used for BTMS INOP cooling times?

Answer 14

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)

Question 15

What are the 5 steps to determining brake cooling times?

Answer 15

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

Question 16

Which hydraulic system powers NWS?

Answer 16

System 3

Question 17

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

Answer 17

System 2