Landing Gear Flashcards
1
Q
What does the landing gear system consist of
A
4 non-retractable landing gear assemblies
2
Q
What does each landing gear assembly have
A
- Air-oil shock strut
- braking system
- Tube-type tires
3
Q
What do the air/oil shock struts utilize and why
A
Compressed gas to absorb shock and hydraulic fluid to dampen up and down movements
4
Q
Explain the forward landing gear assembly
A
- Have fixed fixed-cantilever type struts with dual wheels
- Struts mounted between forward inter-tank areas on the left and right sides
5
Q
Explain the aft landing gear assembly
A
- Single wheel that can swivel 360° and can be hydraulically centered and locked in trailing position using swivel locks
- Right landing gear can be steered by power steering control knob using the power steering actuator
- Struts mounted to airframe pod structure adjacent to ramp, with access door for preflight
- Landing gear proximity (Weight-on-wheels) switches
6
Q
Explain the WOW switches
A
- Two switches installed on aft landing gear assemblies
- Switch is activated when associated shock strut is compressed during touchdown
- Once activated, signals from switches sent to DAFCS to improve ground handling by reducing pitch axis gain of DAFCS, cancelling stick input to DASH actuators, driving both LCT actuators to GND position
- Will also illuminate on the maintenance panel
- Switch on the right will disable flare and chaff dispensers when activated.
- Switch on the left prevents cancellation of mode 4 transponder codes
- Not activated in water landing
7
Q
Are all six landing gear axles interchangeable
A
Yes
8
Q
Explain the tires/wheels
A
- Wheel rim consist of two halves and have moisture-proof seals protecting bearings
- Tires have 10-ply rating and utilize tubes for both tubeless and tube-type tires
9
Q
Explain the wheel brake system
A
- May be applied by either pilot, and power assisted by utility hydraulic system pressure
- Components include: Pressure reducer, master cylinders, transfer cylinders, transfer valves, parking brake valve, wheel brake assemblies, and hydraulic control panel
- Disk brakes used on all 6 wheels
10
Q
Explain the pressure reducer
A
- Located on #1 side of #8 and #9 driveshaft synchronizing shaft mounting structure box
- Reduces system pressure from 3,000 PSI to 1,390 PSI for pilot assist in brake operation
11
Q
Explain the brake accumulator
A
- Located on the #1 side of forward XMSN fairing, aft of forward XMSN
-25cubic inches
- maintains wheel brake system pressure during normal operation, enough reserve pressure to allow several applications of brakes in case of fluid loss or system isolation
- Normal pressure for preflight is 600 to 1400 PSI
12
Q
Explain the brake pedals
A
- Attached to the top of each master cylinder
- Top portions must be depressed to apply brake
- Separate from the yaw function of pedals
13
Q
Explain the master cylinders
A
- Total of 4, each mounted to a yaw pedal
- Can be applied independently or simultaneously (pedals)
- Pilot and copilot cannot apply brakes at same time
14
Q
Explain transfer valves
A
- Combine pilot and copilot brake input to the corresponding brakes
- Located underneath canted console, adjacent to copilot pedals
- Allow independent braking action by either pilot
- Either pilot will feel back pressure if the other pilot applies pressure to the brakes
15
Q
Explain the parking brake valve
A
- Holds on the wheel brake assemblies maintaining the aircrafts position on the ground
- Located under the canted console adjacent to the pilot’s pedals
- When brakes are pressed and parking brake is pulled out, pressure is trapped between parking brake valve and wheel brake assemblies
- Pulling the brake handle activates a microswitch on parking brake valve that lights the PARK BRAKE ON advisory
- To release the parking brakes, it requires applying pressure to either brake pedals
