When does the Blue pump operate
- after the first engine is started
PTU operation in AUTO
- differential pressure of 500 psi between GREEN and YELLOW
- after the first engine start until the second engine start, unless inhibited
When is the PTU inhibited?
- on the ground with master switches split AND either the nose wheel steering disconnected OR the parking brake ON
- also during and for 40 seconds after cargo door operation
ENG 1 (2) PUMP pb FAULT
- reservoir level low
- reservoir overheat
- reservoir air pressure low
- pump pressure low (inhibited on the ground with the engine stopped)
This light goes out when the crew selects OFF, except during an overheat. The light stays on as long as the overheat lasts.
YELLOW ELEC PUMP pb FAULT
- reservoir level low
- reservoir overheat
- reservoir air pressure low
- pump pressure low
- pump overheat
This light goes out when the crew selects OFF, except during an overheat. The light stays on as long as the overheat lasts.
BLUE ELEC PUMP pb FAULT
- reservoir level low
- reservoir overheat
- reservoir air pressure low
- pump pressure low (inhibited on the ground with the engine stopped)
- pump overheat
This light goes out when the crew selects OFF, except during an overheat. The light stays on as long as the overheat lasts.
PTU pb FAULT
- GREEN or YELLOW overheat
- GREEN or YELLOW reservoir low air pressure
- GREEN or YELLOW reservoir level low
This light goes out when the crew selects OFF, except during an overheat. The light stays on as long as the overheat lasts.
HYD priority valves
Removes hydraulic power from the heavy users and protects the flight controls
RAT drop
The flight crew can manually extend the RAT at any time with the RAT MAN ON pb.
The RAT extends automatically with the loss of AC BUS 1 and AC BUS 2
What are some users of the YELLOW system?
Flaps
Nose wheel steering
Alternate brakes
ENG 2 thrust reverser
What are some users of the GREEN system?
Landing gear
Normal Brakes
Slats and Flaps
ENG 1 thrust reverser
What are some users of the BLUE system?
Emergency generator
Slats
If the FAULT light illuminate in the ENG 1 pump, where do you find the nature of the fault?
ECAM
