LO:
-80%.
NORM:
-100%.
HI:
-120%.
COCKPIT:
-Adjust Temperature for the Flight Deck Zone, 12oclock = 24°C / COLD position = 18°C / Hot position = 30°C.
FWD CABIN:
-Adjust Temperature for the FWD Cabin Zone, 12oclock = 24°C / COLD position = 18°C / Hot position = 30°C.
AFT CABIN:
-Adjust Temperature for the AFT Cabin Zone, 12oclock = 24°C / COLD position = 18°C / Hot position = 30°C.
ON:
-Automatically controls zone Hot Air pressure regulating valve.
OFF:
-Closes Hot Air pressure regulating valve and trim air valves and resets fault circuit.
-Illuminates amber when the duct overheat is detected (88°c or 80°c four times durning 1 flight. The fault extinguishes when temperature drops below 70°c and off is selected.
ON:
-Automatically controls Pack Flow control valve. Valve regulates flow, except in the following conditions:
1.Upstream pressure is below minimum.
2.Compressor outlet overheat.
3.During Engine Start sequence with ENG MODE selector set to IGN/START or CRANK and Either ENG MASTER switch is ON, The start valve is open and N2 is less than 50%.
4.Corresponding fire switch is depressed.
5.DITCHING switch is selected ON.
OFF:
-Closes Pack Flow control valve. (Note: In case of a pack overheat, the valve closes automatically)
FAULT:
-Illuminates amber when the pack flow control valve position disagrees with selected position, or if compressor outlet overheats.
ON:
-Illuminates blue when selected on. If the DITCHING switch is in its normal guarded position:
1.Ram Air inlet opens.
2. Normal outflow valve control is maintained if differential pressure is greater than or equal to 1 psi.
3. Outflow valve opens if differential pressure is less than 1 psi.
OFF:
-Closes Ram Air inlet.
ON:
-Opens Bleed valve provided:
1.Upstream pressure is above 8psi.
2. APU BLEED switch is OFF or APU Bleed valve is closed.
3. There is no leak, overpressure or overtemperature detect.
4. ENG FIRE switch not released out.
5. Engine start valve is closed.
OFF:
-Closes Bleed valve and HP valve. OFF light illuminates white.
FAULT:
-Illuminates amber to indicate:
1. Overpressure downstream of Bleed valve.
2. Bleed overheat.
3. Wing or engine leak on associated side.
4. Bleed valve not closed during Engine Start.
5. Bleed valve not closed with APU Bleed ON.
- ON:
-Opens APU Bleed valve provided N is greater than 95% and there is no leak on APU or left side Bleed.
OFF:
-Closes APU valve.
FAULT:
-Illuminates amber when APU leak is detected.
- AUTO:
-Opens crossbleed valve if APU Bleed valve is open; closes crossbleed valve if APU Bleed valve is closed or an air leak is detected.
OPEN:
-Opens crossbleed valve.
SHUT:
-Closes crossbleed valve.