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if lights change to green.
Hey, turn the lights back on! When shutting down for an overnight you can
keep the lights on when turning off the APU and External Power by going into the
forward galley and finding the overhead panel. You will see one hole in the
plastic cover over the breakers. This is the MAINT BUS switch and you can
press it ON. This will keep the lights on in the cabin and cargo bins with External
Power plugged in but selected OFF.
Airbus
Overhead Panel
Push-Button & Switching
Explanation
(For reference only. Not approved by CX)
A330 & A340
Overhead Panel Switches
10-Aug-10 For reference only 1
Airbus Overhead Panel Switches
21. AIR / PRESSURIZATION / VENTILATION
PACK 1
On – Pack flow control valve opens automatically except when;
- upstream press below min.
- compressor outlet overheat
- engine start sequence (Mode selector IGN, reopen after 30s if no eng
start.)
- any door is not closed and locked, a/c on gnd, an engine running.
- Onside engine fire Pb pressed
- ditching selected.
Note: On gnd, valves reopening is delayed 30s to avoid a supplementary pack closure cycle
during subsequent eng start. If there is no electrical power, the flow valves remain open and
permit NORM flow.
Off - Valve closes provided it is electrically supplied
Fault - Valve position disagree with Selector position
- Compressor outlet overheat
- Pack outlet overheat
PACK FLOW
NORM
LO HI LO - 80% (Less than 140 in EY)
NORM - 100%
HI - 120% (abnormally hot and humid conditions)
one bleed fail, then HI limited to 112%
Note: When single pack ops or APU supply – auto HI
COCKPIT (CABIN)
12 O’clock - 24˚C The actual temp. is measured by
COLD - 18˚C sensors in the cockpit, galley &
HOT - 30˚C lav circuits.
COLD HOT
CAB FANS
On - The 2 cabin fans (recirculation fans) run.
- cabin air blown to avionics comp. And mixer unit.
Off - The 2 cabin fans stop
Note: Should a fan failure occur, ECAM caution is activated.
Overhead Panel Switches
10-Aug-10 For reference only 2
HOT AIR 1
On - Valve regulates hot air pressure
Off - Valve closes
- Fault circuit is reset
- If HOT AIR 1 - Fwd cargo heat is lost
Fault - duct overheat detected (88˚C)
- Valve & associated trim air valve close automatically
- FAULT Lt goes out automatically when temp <70˚C, or OFF.
RAM AIR
On - Illuminates white
If DITCHING Pb is in normal pos’n:
- RAM air inlet opens
- If Δp < 1 psi: each outflow valve opens to about 50% when not under
manual control. Emergency ram air directly supplied to mixer unit.
- If Δp ≥ 1 psi: each outflow valve remains normally controlled. No
emergency ram air flows in.
Off - Ram air inlet closes, outflow valves return to normal position
LDG ELEV
AUTO - System uses FMGS data to construct pressure schedule.
Other Pos’ns - Doesn’t use FMGS data. Uses selected elevation.
MODE SEL
AUTO - One of the 2 systems is controlling the outflow valve.
- 2 outflow valves.
- Each operated by 1 of 3 motors, 1 man 2 auto.
- Transfer between the 2 sys occurs 80s after ldg or if one fails. Can
select stby sys by switching to MAN for > 3s then AUTO.
- Uses Ldg elev and QNH from FMGC, and press alt. from ADIRS. If
FMGC data n/a the uses Capt. Baro Reference from ADIRS, and
LDG ELEV selection.
MAN - Use MAN V/S CTL to control system.
FAULT lt - Amber with ECAM when both automatic systems faulty.
V/S CTL
Controls the position of the outflow valves when in MAN mode.
UP - The valve(s) move toward the open position.
DN - The valve(s) move toward the closed position
Overhead Panel Switches
10-Aug-10 For reference only 3
AUT
O
VALVE SEL
AFT - The aft valve MAN controlled, fwd AUTO.
- Both valves are MAN controlled.
FWD - The fwd valve MAN controlled, aft AUTO.
DITCHING
Normal - The system functions normally.
ON - The following valves close; (Lt White)
- outflow valves. Will not close automatically if under MAN control.
- emergency ram air inlet
- avionics ventilation overboard valve
- cargo compartment isolation valves
- pack flow control valves
- cabin fans stop
Caution: If the ditching pb is put ON, on ground, with low pressure ground cart connected and all
doors closed, a differential press will build up.
EXTRACT
AUTO - On gnd, Eng 2 & 3 not running (both Eng A330);
- the underfloor extract valve is closed
- OVBD valve is open
　
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