AIR CONDITIONING/ PRESSURIZATION/ VENTILATION ACTUAL 2026 QUESTIONS AND 100% CORRECT ANSWERS

AIR CONDITIONING/PRESSURIZATION/VENTILATION
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1. Can the flight Fan disabled in flight
deck fan operate
in flight? FCOM 1
- 21.10.2



2. How is the MAN (spring loaded to 6 o'clock position)—flight deck trim air valve controlled
flight deck tem- manually.
perature adjust- C (cool)—valve moves toward closed to supply cooler air.
ed with the flight W (warm)—valve moves toward open to supply warmer air.
deck tempera-
ture selector in
MAN? FCOM 1 -
21.10.2

3. Which zones Flight (FLT) DECK Temperature
are temperature range C to W sets temperature from 18°C to 29°C. Mid position, 12 o'clock, sets
range limited approximately 24°C
18°C to 29°C?
FCOM 1 - 21.10.2

4. How does alter- Alternate Ventilation (ALTN VENT) Switch
nate vent oper- ON:
ate? FCOM 1 - • with airplane depressurized, opens alternate ventilation valve
21.10.4 • outside air is supplied to flight deck
• when switch is pushed ON, valve moves to open position
• 20 seconds after switch is pushed ON, valve can be re-positioned with the
Alternate Ventilation selector

Off:
alternate ventilation valve closed
Alternate Ventilation Selector
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, AIR CONDITIONING/PRESSURIZATION/VENTILATION
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Spring loaded to 12 o'clock position.

When Alternate Ventilation switch ON:
• CLOSE — moves the alternate ventilation valve toward closed
• OPEN — moves the alternate ventilation valve toward open




5. What is the func- Push:
tion of the PACK • resets pack fault protection system
RESET switch? • resets zone trim air fault protection system
FCOM 1 - 21.10.8 • restarts pack after automatic shutdown if fault no longer exists
• reopens master trim air valves if duct overheat no longer exists

6. What is the pur- Each pack is controlled by an Integrated Air System Controller (IASC). Each IASC
pose of IASC controls the respective pack and some bleed air functions.
& how many There are 3 x IASC
IASC are in-
stalled? FCOM 1 -
21.20.1

7. Describe the Each pack valve has three flow rates; economy, normal, and high. During cruise
air condition- economy flow and normal flow reduce bleed air demand on the engine to reduce
ing pack flow fuel consumption. Fuel consumption is reduced approximately 0.6% for each pack
rates regulation? in economy flow and approximately 0.3% for each pack in normal flow.
FCOM 1 - 21.20.1

8. When will pack In cruise flight at or above FL250, the configuration for economy flow is:
output automat- • all packs operating, and
ically operate in • the Pack High Flow switch off, and

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