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2 Squib lights Squib light
2 Master warnings 2 Master warnings
ECAM ECAM
Fire light on pedestal
5) RAT MAN ON P/B
Extends RAT providing 2500 psi to the Blue hydraulic system.
The emergency generator is not powered.
6) PTU P/B
AUTO - PTU is armed to run when a 500 psi differential pressure exists between the
Green and Yellow hydraulic systems.
The PTU is inhibited during the first engine start and self-tests during the
second start, provided the parking brake is set.
Note: The PTU logic inhibits its operation anytime:
· Cargo doors are being operated
· Parking brake set with one ENG MASTER selected ON
· Parking brake OFF with one ENG MASTER selected ON and the NWS
deactivation pin installed.
· PTU P/B selected OFF
·  PTU operation is inhibited for 40 seconds after cargo door operation
OFF - PTU is deactivated. Selecting OFF extinguishes Fault light. The exception
being for an overheat, the fault light will remain illuminated until the overheat
condition is alleviated.
FAULT - Green or Yellow systems
· Low quantity
· Reservoir overheat - 93°c
· Reservoir low air pressure - 23 psi
Note: After starting engines if the PTU failed to test properly, you may get a
PTU fault on the ECAM. To reset the PTU turn the Yellow Electric pump
ON then OFF after engine start is complete.
7) BLUE ELECTRIC PUMP (Receives power from AC Bus # 1)
AUTO - If AC power is available the electric pump is energized:
· In-flight
· On the ground with at least one engine running
· When the blue pump override switch on the MX panel is selected ON
OFF - The pump is de-energized.
A I R B U S A 3 2 0 / 3 1 9 S T U D Y G U I D E
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FAULT - · Low quantity
· Reservoir overheat - 93°c
· Low air pressure - 23 psi
· Low pump pressure - 1450 psi (Inhibited on the ground with engines stopped)
· Pump overheat
8) YELLOW PUMP P/B (Receives power from AC Bus # 2)
ON - The Yellow pump is energized.
OFF - Pump is de-energized.
FAULT - · Low quantity
· Reservoir overheat - 93°c
· Low air pressure - 23 psi
· Low pump pressure - 1450 psi
· Pump overheat
Note: The Yellow pump will run when the cargo door manual selector is set
to either the open or close position, however, the operation of the flight
controls and PTU is inhibited. The cargo door system is a closed loop circuit;
if the door manual selector sticks in the on position after the cargo doors are
opened, the pump will remain energized and the yellow system will overheat.
Turning the Yellow pump switch on will circulate fluid throughout the whole
system, alleviating the overheat condition. Contact MX or Ramp personnel to
correct the problem.
9) ENGINE PUMP P/B
ON - Pump pressurizes when engine is running (3000 psi ±200 psi)
OFF - Pump is depressurized. Selecting OFF extinguishes fault light except for an
overheat. Fault light will remain illuminated until the overheat condition is
alleviated.
FAULT - · Low quantity
· Reservoir overheat - 93°c
· Low air pressure - 23 psi
· Low pump pressure - 1750 psi
10) X-FEED P/B
OFF - The crossfeed valve closes
ON - The X-feed valve opens
OPEN - The X-feed valve is fully open. ON remains illuminated
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11) FUEL PUMP P/B
ON - Pump is energized. Main pumps provide 25 psi, and are fitted with suction
valves to allow gravity feeding of the wing tanks to the engine. The main
boost pump pressure is lower than the center tank boost pump pressure, which
helps to insure that the center tank fuel will be used first.
OFF - Pump is deactivated
FAULT - Low output pressure
1 2 ) MODE SEL P/B
AUTO - Center tank pump control is automatic. The pumps will run for 2 minutes
after engine start, or any time the slats are retracted.
The center tank pumps will be commanded OFF:
· 5 minutes after the CTR tank low level is reached.
· When the wing tank inner cells overfill is sensed, from fuel returned from
the IDG cooling system. In this case, the center tank pumps will remain
off until approximately 1100 pounds of fuel is burned from the wing
tanks.
MAN - The center tank pumps are manually controlled
FAULT - The center tank contains more than 550 pounds of fuel and either wing tank
has less than 11000 pounds. This fault light may illuminate when the center
tank fuel is burned out of sequence, or during refueling.
　
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