Air Conditioning / Pressurisation Flashcards
True / False - Each pack is capable of supporting the air conditioning and pressurization
requirements ?
True
Cabin air can be recirculated within the cabin by ?? fans.
2
Conditioned air from a ground air conditioning unit may be supplied to the distribution system via ?
The LP ground connection
The airflow from pack 1 and 2 service which areas of the aircraft respectfully ?
Pack 1 services the flight deck
Pack 2 services the cabin
Air conditioning pack valves are open when the relevant PACK p/b is blank, and the following conditions are met ?
- Bleed air pressure exceeds 10 psi.
- No overheat condition exists (An overheat condition will close the pack valve and an alert will be presented).
- No auto shutoff has occured.
Auto shutoff of both packs occurs when:
1. On the ground ?
2. In flight ?
- On the ground during engine starting or when both thrust reversers are unlocked.
- In flight when If an engine failure is detected during take-off or in flight at altitudes below 13,500 ft and a thrust lever setting above MIN TO is selected.
Following the automatic shut-off of the packs due to engine failure, pack operation can be restored MANUALLY by operating ?
The AIRCOND AUTO SHUT p/b located at the ram air panel OR by selecting a lower
thrust lever setting.
Following the automatic shut-off of the packs due to engine failure, pack operation is restored AUTOMATICALLY when climbing above ?
13 500 ft
What are the three modes of pack flow control ?
Normal
Economy
Augmented
ECONOMY pack flow is obtained when ?
Both pack valves are open and the automatically controlled cabin temperature is within a preset range from the selected temperature
ECONOMY pack flow is automatically selected when ?
3 conditions
- During take-off (Normal flow is restored approx 1 minute after lift-off)
- Upon TOGA activation. (Normal flow is restored after 1 minute)
- As long as maximum take-off thrust is selected.
ECONOMY flow is inhibited when ?
Both temperature control p/b’s are in manual mode
The AUGMENTED pack mode is operative when ?
One pack is manually switched OFF
What conditioned air can be supplied to the manifold for distribution throughout the aircraft via a ground connection ?
Low pressure air
The automatic mode of the pressurisation system allows a maximum differential pressure of ?
7.46 psi
A cabin differential of 7.46 means that at an altitude of 35,000 ft what cabin altitude is maintained ?
8,000 ft
The outflow valves will normally limit in both automatic and manual mode the maximum differential pressure to ?
7.65 psi
The outflow valves will normally limit in both automatic and manual mode the maximum cabin altitude to ?
12 000 ± 1500 ft
An excessive cabin altitude warning is presented when cabin altitude exceeds ?
10 000 ft
How many inward pressure relief valves prevent
negative cabin pressure.
2
True / False - In the automatic mode the outflow valves are controlled by a dual channel pressurization controller ?
True
Pressurization of the cabin commences when ?
Take-off thrust is selected
How many channels are actively managing the pressurisation of the cabin at any point in time ?
Only one channel is in active control
The pressurisation channel that is in standby monitors ?
All conditions in order to take over control immediately when the active channel fails
True / False - Active and standby is automatically alternated after each landing or power interruption ?
True
The channels can also be alternated manually by ?
Pressing the PRESS CONTROL p/b two times in succession
True / false - Each channel of the pressurization controller receives inputs from the pressurization panel ?
True
When the pressurisation system is In the MANUAL mode the outflow valves are ?
Controlled pneumatically and independent of electrical input from the dual channels
Placing the manual control lever to the UP position will ?
Depressurize the cabin
```
The outflow valves will at any time limit the cabin altitude to ……. provided airflow from the
air conditioning pack(s) is available ?
12 000 ± 1500 ft
