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Both valves failed closed : Optimized regulation is lost. Trim air valves are driven to full
closed position. Packs only regulate the temperature.
TRIM AIR VALVE FAILURE
Applicable to: ALL
Failed
closed
: Optimized temperature regulation of half of the corresponding zone is lost.
Failed open : Corresponding hot air valve closes.
Optimized temperature regulation of half of each zone is lost.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-21-10-50 P 1/16
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to:
(1) PACK pb
On : The pack flow control valve is automatically controlled.
It opens, except in the following cases :
Upstream pressure below minimum‐
Compressor outlet overheat‐
Engine start sequence :‐
1. One valve (or both, if the crossbleed valve is open) closes when :
• The MODE selector is set to IGN, when on ground (valves reopen if
MASTER switch or MAN START pushbutton are not set to ON within
30 s) ;
• The MODE selector is set to IGN (or CRANK) and when (on either
engine) :
The MASTER switch is set to ON (or MAN START pushbutton is set to‐
ON) and,
The start valve is open and‐
N2 < 50 %.‐
2. On ground, reopening of the valves is delayed 1 min to avoid a
supplementary pack closure cycle during subsequent engine start :
Any door is not closed and locked, aircraft on ground, and any engine ‐running
Onside engine fire pushbutton is pressed‐
Ditching is selected.‐
Note: If there is no electrical power, the flow valves remain open and permit
NORM flow.
OFF : The pack flow control valve closes, provided it is electrically-supplied.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-21-10-50 P 2/16
FCOM 19 AUG 10
FAULT lt : The amber light and associated ECAM caution comes on, when the pack flow
control valve position disagrees with the selected position, or in the case of
compressor outlet overheat or pack outlet overheat.
(2) PACK FLOW selector
Selects the pack flow, depending on the number of passengers, and on the ambient conditions
(smoke removal, hot or wet conditions) : LO (80 %) - NORM (100 %) - HI (125 %). If one bleed
fails, the flow is limited to 112 %. In single pack operation, or with theAPU bleed supply, any
selection is irrevelant. In these cases, HI pack flow demand is generated automatically.
(3) Zone temperature selector
12 o'clock position : 24 °C (76 °F)‐
COLD position : 18 °C (64 °F)‐
HOT position : 30 °C (86 °F)‐
(4) HOT AIR 1 (or 2) pushbutton
On : The valve regulates hot air pressure.
OFF : The valve closes. The FAULT circuit is reset.
Forward cargo heating 　 is lost, if HOT AIR 1 is affected.
FAULT lt : The amber light and associated ECAM caution come on, when a duct overheat
is detected (88 °C/190 °F). The valve, and the associated trim air valves close
automatically. The FAULT light goes off, when the temperature drops below
70 °C (158 °F), and the flight crew selects OFF.
(5) RAM AIR pushbutton (guarded)
ON : The ON light comes on white.
If the DITCHING pushbutton, on the CABIN PRESS panel, is in the normal position :
The RAM air inlet opens.‐
If ‐▵P < 1 PSI : Each outflow valve opens to about 50 % when under automatic
control. They do not automatically open when under manual control. The
emergency ram air flow is directly supplied to the mixer unit.
If ‐▵P ≥ 1 PSI : Each outflow valve remains normally-controlled. No emergency ram
air flows in.
Off : The RAM air inlet closes, and the outflow valves return to the normal position.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-21-10-50 P 3/16
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to: ,
(1) PACK pb
On : The pack flow control valve is automatically controlled.
It opens, except in the following cases :
Upstream pressure below minimum‐
Compressor outlet overheat‐
Engine start sequence :‐
1. One valve (or both, if the crossbleed valve is open) closes when :
• The MODE selector is set to IGN, when on ground (valves reopen if
MASTER switch or MAN START pushbutton are not set to ON within
30 s) ;
• The MODE selector is set to IGN (or CRANK) and when (on either
engine) :
The MASTER switch is set to ON (or MAN START pushbutton is set to‐
　
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