Landing Gear/Brakes Flashcards
What is a PSEU?
Proximity Sensing Electronic Unit
-sensors and switches that measure physical relationship between two components to provide a “far” or “near” signal
How many proximity sensors on each landing gear? WOW?
- 2 as well.
What holds up the nose landing gear up and down in the 200? 7/900?
200:
Up: Mechanical Uplock
Down: Overcenter Locking Mechanism
7/900:
Up-Overcenter mechanism
Down-Overcenter mechanism
How is the main landing gear held up on all 3 airplanes?
Mechanical Uplocks
What locks the gear down on the 200? 7/900?
200: Locking mechanisms in the MLG side strut actuators
7/900: Locking mechanisms in the MLG side stays
What prevents the gear from being retracted on the ground?
Solenoid Lock
Force required for manual gear extension?
40lbs.
NWS deflection on the 200? 7/900?
200: 70 degrees
7/900: 80 degrees
Turning radius on 200/7/900?
2/700: 75ft
900: 80ft
What hydraulic system powers the onboard brakes? Outboard?
Inboard: 3
Outboard: 2
How do the wheels stop moving on gear retraction?
Hydraulic pressure from the landing gear selector valve is directed to the brake control valves to stop MAIN WHEEL rotation
Failure of Hydraulic system 2/3, what provided brake pressure for landing and how many landings with anti skid off?
Accumulators provide pressure for 6 brake applications but loss of system 2/3 results in 50% reduction in braking capability
When does anti-skid become operational?
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
What charts are used for BTMS INOP cooling times?
- Max quick turnaround weight (performance cards)
- TLR/Speed Cards
- V1MBE Charts (QRH Vol 1, Perf-04)
- V1/V1MBE Ratio Chart (QRH Vol 1, Perf-04)
What are the 5 steps to determining brake cooling times?
- Determine Max Quick Turnaround Weight (MQTAW)
- Determine V1 for next takeoff (Higher of 2)
- Determine V1MBE for next takeoff
- Calculate V1/V1MBE ratio
- ex: V1=147, V1MBE=171, 147/171=.89 - Determine Brake cooling times