Airbus A320 Systems - Pressurization Related Panels

Front 1

LDG ELEV selector
(CABIN PRESS Panel)

- AUTO
- Other position

Back 1

AUTO:
FMGS data used to construct an optimized pressure schedule.

Other position:
The pressurization schedule does not use the landing elevation from the FMGS, but instead uses the landing elevation selected with this knob (from – 2,000 to + 14,000 feet) as its reference.

Front 2

MODE SEL pb
(CABIN PRESS Panel)

- AUTO
- MAN
- FAULT Light

Back 2

AUTO:
Automatic mode is operating. One of the two cabin pressure controller moves the outflow valve. Recycling this pb (MAN 10 sec then back to AUTO) switches controllers.

MAN:
MAN V/S CTL switch to control the outflow valve.

FAULT Light:
With ECAM caution light comes on only when both automatic systems are faulty.

Front 3

MAN V/S CTL toggle sw
(CABIN PRESS Panel)

- UP
- DN

Back 3

Springloaded to neutral. Controls the outflow valve position through operation of the MAN motor, when the MODE SEL pushbutton is in the MAN position.

UP: The valve moves towards the open position.

DN: The valve moves towards the closed position

Front 4

DITCHING guarded pb
(CABIN PRESS Panel)

- ON

Back 4

ON:
sends a “close” signal to:
- fwd cargo isolation outlet valve (The cargo recirculation fans stop automatically.)
- avionics ventilation inlet and extract valves
- emergency ram air inlet
- pack flow control valves
- outflow valve

Front 5

BLOWER and EXTRACT pb
(VENTILATION Panel)

- AUTO
- OVRD
- FAULT Light

Back 5

AUTO (Both pb):
Open/closed config depending on temperature until TO power, then closed or intermediate.

(Either pb in OVRD):
- Closed config. A/C system supplies cooling.
- With BLOWER pb in OVRD blower fan stops.

(Both pb in OVRD):
- Air flows from the a/c sys and then overboard
- The extract fan continues to run.

FAULT Light (blower pb):
- blowing pressure low
- duct overheats
- computer power supply fails
- smoke warning is activated

FAULT Light (blower pb):
- extract pressure is low
- computer power supply fails
- smoke warning is activated.

Front 6

FWD ISOL VALVE pb
(CARGO HEAT Panel)

- AUTO
- OFF
- FAULT Light

Back 6

AUTO:
- The inlet and outlet isolation valves open.
- The extraction fan runs when the aircraft is on ground, or if diff P <= 1 psi in flight. If diff P > 1 psi, the fan stops.
- If smoke is detected in the forward cargo bay, the valves close and the fan stops.

OFF : The inlet and outlet isolation valves and the trim air valve close; the extraction fan stops.

FAULT light:
With the ECAM caution when either inlet or outlet valve is not in the selected position.

Front 7

Temperature selector
(CARGO HEAT Panel)

- COLD
- Middle position
- HOT

Back 7

- COLD: Approximately 5° C (41° F)
- Middle position: Approximately 15° C (59° F)
- HOT: Approximately 26° C (79° F)

Front 8

Zone temperature selector sw:
(AIR COND Panel)

- COLD
- Middle
- HOT

Back 8

- COLD position: 18°C (64°F)
- Middle position: 24°C (76°F)
- HOT position: 30°C (86°F)

Front 9

HOT AIR pb
(AIR COND Panel)

- ON
- OFF
- FAULT Light

Back 9

ON:
Hot Air Pressure Regulator Valve regulates hot air pressure.

OFF:
Valve closes, and the trim air valves close. The FAULT circuit is reset.

FAULT Light:
Duct overheat temp = 88°C (190°F). Triggers ECAM msg.
The valve and the trim air valves close automatically. The FAULT light goes off when temp < 70°C (158°F), and the flight crew selects OFF.

Front 10

PACK pb
(AIR COND Panel)

- ON
- OFF
- FAULT Light

Back 10

ON:
Pack flow control valve is automatically controlled.
It opens, except:
- Upstream pressure below minimum;
- Compressor outlet overheat;
- Engine start sequence;
- Fire pb on same side is pressed;
- Ditching pb ON;

OFF:
The pack flow control valve closes.

FAULT Light with ECAM:
- valve position disagree with selected position
- compressor outlet overheat
- pack outlet overheat

Front 11

ECON FLOW pb (321)
(AIR COND Panel)

- ON
- OFF

Back 11

ON:
ECON flow is selected.

OFF:
Normal flow is selected. Normal flow provides 20 % more than ECON flow.

Front 12

PACK FLOW selector (A319)
(AIR COND Panel)

- LO
- NORM
- HI

Back 12

LO (80 %)
NORM (100 %)
HI (120 %)

Goes into high automatically when:
- single pack operation
- with APU bleed supply

If LO is selected, the pack flow can be automatically selected up to 100 % when the cooling demand cannot be satisfied.

Front 13

RAM AIR pb (guarded)
(AIR COND Panel)

- ON
- OFF

Back 13

ON:
- The RAM air inlet opens if the DITCHING pb is not selected ON.

- If differential press => 1 psi: The outflow valve control remains normal. No emergency RAM air flows in.
- If diff press < 1 psi: The outflow valve opens to about 50 % when under automatic control. It does not automatically open when it is under manual control. Emergency RAM airflow is directly supplied to the mixer unit.

OFF:
The RAM air inlet closes.

Front 14

CAB FAN pb
(VENTILATION Panel)

- ON
- OFF

Back 14

ON:
The two cabin fans are on.

OFF:
The two cabin fans are off.

Front 15

CREW SUPPLY pb
(OXYGEN Panel)

- ON
- OFF

Back 15

ON:
The valve is open, and supplies low pressure oxygen to the masks (normal position in flight).

OFF:
The valve is closed, and the white light comes on.

Front 16

PASSENGER SYS ON Iight
(OXYGEN Panel)

Back 16

This light comes on white, when the control for the oxygen mask doors is activated, and it remains on until the TMR RESET pb is pressed.

Front 17

MASK MAN ON pb
(OXYGEN Panel)

- AUTO
- Pressed

Back 17

AUTO:
The mask doors open automatically when the cabin altitude exceeds 14,000 feet.

Pressed:
The mask doors open.