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When does the pressure relief valve open in PSP?
Normal Hydraulic Pressure
Normal RAT operating range
Pressure reserved by wheel brake/emergency flap accumulator if HYD 1 loses pressure
Pressure at which HYD 2 PRESS caution light extinguishes
Pressure required to close HYD 2 bypass valve and retract RAT if deployed
Pressure at which HYD 2 PRESS caution light illuminates
1660 +/- 110 psi
Pressure at which RAT deploys
1500 +/- 100 psi
Pressure at which priority valve in PSP reopens to provide power for general services
1500 +/- 100 psi (1500 psi)
Pressure at which priority valve in PSP closes to isolate flight controls from general services
1500+/- 100 psi (1600 psi)
Required nitrogen preload pressure for wheel brake / emergency flap accumulator
1300 +/- 50 psi
Pressure at which HYD 1 PRESS caution extinguishes
Pressure at which HYD 1 PRESS caution illuminates
1660 +/- 110 psi
N2 RPM required to use HYD 2 RESET button
N2 RPM below which HYD 2 bypass valve is energized open to reduce engine loads on start
Number of full brake applications provided by brake/emergency flap accumulator
Requirements for HYD FAIL Warning
- 1) HYD 1 Pressure below 1660 +/- 110 psi
- 2) HYD 2 Pressure below 1660 +/- 110 psi
- 3) Emergency system pressure less than 600 +/- 50 psi
Devices in general services category
- 1) Flaps
- 2) Slats
- 3) Speed Brakes
- 4) Landing Gear
- 5) NWS
- 6) Arresting Hook
- 7) Launch Bar
- 8) Wheel Brakes
_________ ensure adequate base pressure to resist pump cavitation under all flight conditions
Nitrogen pressurized resevoirs
The power supply package (PSP) consists of
Check valves, pressure relief valve, priority valve
When does the WHEELS warning light illuminate?
When LDG GEAR handle is not set to DN, N2 < 95% and
1) Altitude less than 7200' MSL and airspeed less than 170 knots
2) FLAPS/SLATS lever not in up position
What does HYD 1 supply hyd power to?
General services and flight controls
What does HYD 2 supply hyd power to?
If HYD 2 and RAT fail, what effect on total HYD System?
None. HYD 1 still operating everything normally.
If HYD 2 is leaking, will RAT do the job?
Brake accumulator gauge is reading what?
Flight control accumulators have precharge of what?
1100 +/- 50 psi
Hand pump up to what psi?
HYD 1 EDP constant output
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