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Failure of the Primary channel causes the hot air and trim valves to close.
The Secondary controller will then provide a zone temp of 76°f / 24°c.
Failure of only the Secondary channel has no effect on temperature
regulation.
With a Dual channel failure, the packs provide a fixed temp of 70° f / 20°c
for Pack 1 and 50° f / 10°c for Pack 2.
If a Trim Air valve fails, optimized temperature control of only that zone is
lost.
Hot Air Fault, Optimized temperature is lost. Trim valves close. Pack 1 will
control the cockpit temperature; Pack 2 will control the cabin temperature to
the mean value of the FWD and AFT selected temperatures.
Chapter 3
A I R B U S A 3 2 0 / 3 1 9 S T U D Y G U I D E
14
3) PACK P/B
ON - Pack valve is armed to open.
Pack valves will close for:
· Low pneumatic pressure - 8 psi
· Pack overheat - Compressor outlet 260°c
· FIRE P/B is pressed
· Engine start
· DITCHING P/B is selected
Note: Both valves close during the engine start sequence when the mode
selector is set to IGN/CRK. If the second engine is not started within 30
seconds of the first engine, the pack valves will open and then close when the
second engine master is selected to on.
OFF - Pack valve is closed
FAULT - 1) Pack valve disagrees with commanded position or compressor outlet
temp exceeds 230°c four times during one flight.
2) Pack outlet temperature above 95°c.
Pack controller primary channel failure causes the inlet and outlet flaps to go
full open and the pack flow will remain in the last selected position.
With a secondary channel failure ECAM signals related to the pack are lost.
With a dual channel failure the corresponding pack outlet temp is controlled
at 60°f by the pack Anti-ice valve.
4) RAM AIR
ON - The ram air inlet opens. Once the DP is below 1 psi, and the DITCHING p/b
is in normal, the outflow valve will open to approximately 50%. (Provided it
is not in manual)
Ram air is directed to the mixing unit, and should not be opened unless DP is
less than 1 psi. (FM limit)
OFF - The ram air inlet closed
5) HOT AIR P/B
ON - Valve regulates hot air pressure
OFF - The valve closes, Trim Air valves close, and the fault circuit is reset.
FAULT - Duct overheat is detected at 88°c or 80°c is exceeded four times in one flight.
The HOT AIR and TRIM valves close. The Fault light extinguishes when the
duct temp cools below 70°c and OFF has been selected.
Note: If the HOT AIR pressure-regulating valve fails closed, the trim air
valves are driven closed, Pack 1 controls the cockpit and Pack 2 controls the
cabin.
A I R B U S A 3 2 0 / 3 1 9 S T U D Y G U I D E
15
6) APU BLEED AIR
ON - APU bleed valve armed. Valve opens with APU RPM above 95% and no leak
detected on the APU or left side bleed. When the APU bleed valve opens, the
engine bleed valves are commanded closed.
OFF - APU bleed valve is closed
FAULT- APU Leak is detected
7) ENG BLEED P/B
ON - Bleed valve is armed to open
The valve will close for any of the following:
· If supply pressure is less than 8 psi
· If the APU bleed valve is open
· There is a bleed leak
· Over temperature
· Overpressure
· Start valve is open
· The FIRE p/b is pressed
· Wing/Engine Anti-ice overheat
FAULT - · Overpressure downstream of pressure relief valve
· Bleed overheat/Wing/Engine Anti-ice overheat
· Bleed air leak
· Bleed valve not closed during engine start
8) X BLEED SELECTOR
SHUT - Cross bleed valve closed
AUTO - The valve will open when the APU bleed air valve is used.
The valve will close when:
· Air is supplied by the engines
· Any leaks are detected
· The APU fire switch is pushed
OPEN - Valve is open
9) WING ANTI-ICE P/B
ON - Valves open in flight if pneumatic pressure is available. Bleed air is sent to
the outboard slats 3, 4, & 5. Wing Anti-ice may be tested on the ground, the
valves will open for a 30-second test sequence after a successful test valves
will close and re-arm the system.
In-flight care must be used to maintain bleed temperatures above 150°c to
insure symmetrical de-icing capability during low power settings.
OFF - Valves are closed
A I R B U S A 3 2 0 / 3 1 9 S T U D Y G U I D E
16
FAULT - · Valve position disagreement
· Low-pressure 13 psi
· A leak is detected
· On the ground, a Wing Anti-ice test sequence of more than 35 seconds.
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