HYD Flashcards
Normal Operating pressure for Hydraulic System?
With the RAT deployed?
- 3000 PSI
- 2500 PSI with RAT
ENG (1/2) PUMP ON, when does the pump work?
- When the associated engine is running
ENG (1/2) PUMP Amber FAULT light?
(R)LOA P
(R)LOA P
Reserviour Low Level
Reserviour Overheats
Reserviour Air pressure low
Pump Pressure is low
- Light stays on during Overheat
BLUE ELEC PUMP P/B Switch in AUTO?
OFF?
If AC power is available, pump operates:
- In flight
- Ground - if one engine is running or BLUE PUMP OVRD on Maintenance panel is pressed
OFF- Pump is depressurized
BLUE ELEC PUMP P/B Switch Amber FAULT light?
(R)LOA (P)PO
Reserviour
Low Level
Overheat
Air pressure low
Pump
Pressure Low (inhibited on ground with engines stopped)
Overheats
YELLOW ELEC PUMP P/B Switch. What does it do? When is it on?
- Used to pressurize the Yellow System hydraulics when on the ground and engines are stopped, or for taxi.
- Can also a Hand Pump to pressurize the yellow system to operate the cargo doors when no electrical power is available.
YELLOW ELEC PUMP pb sw Amber FAULT light?
(R)LOA (P)PO
Reservior
Level Low
Overheat
Air Pressure low
Pump
Pressure low
Overheat
PTU pb sw in AUTO?
OFF?
- Automatically supplies pressure to other system (Green/Yellow) if differectial is greater than 500 PSI
- OFF - both PTU valves close, power transfer stops
RAT MAN ON pb
- Manually extends the RAT for the purposes of Hydraulics
- Does not provide Electrical power
Name important items on the Green Hydraulic System
- Landing Gear
- Normal Brakes
- Engine 1 Reverser
Name important items on the Blue system
- Emergency Generator
- RAT
Name important items on the Yellow system
- Alternate parking brake
- Nose wheel steering
- Engine 2 Reverser
