Questions and Answers
Which part of the aircraft receives conditioned air?
Cockpit, cargo bays and cabin
What happens when the hot air fault light illuminates on the air conditioning panel?
The hot air press.reg.valve opens and the trim air valves close.
Which type of air does the trim air provide to the air conditioning system?
Warm air
In case of zone controller primary and secondary channel failure, what temperatures are maintained by pack one and pack two?
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What happens when the temperature control unit primary channel fails?
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In the avionics ventilation system, how is the temperature of the cooling air controlled?
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When should the Ram air switch be used to enable Ram air to the mixture unit?
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What happens in the avionics ventilation system if there is a primary channel failure in the pack controller?
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What happens in the avionics ventilation system if there is a secondary channel failure in the pack controller?
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What occurs in the avionics ventilation system in the event of a hot air pressure reg.valve failed open?
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Study Notes
Air Conditioning System
- The mixing manifold receives conditioned air.
Fault Indication
- The hot air fault light on the air conditioning panel illuminates when there is a hot air fault.
Trim Air
- Trim air provides cool air to the air conditioning system.
Zone Controller Failure
- In case of primary and secondary channel failure of the zone controller, Pack One maintains a temperature of 10°C (50°F) and Pack Two maintains a temperature of 18°C (64°F).
Temperature Control Unit Failure
- When the temperature control unit primary channel fails, the secondary channel takes over.
Avionics Ventilation System
- The temperature of the cooling air is controlled by the pack controller.
Ram Air Switch
- The Ram air switch should be used to enable Ram air to the mixture unit when it's necessary to compensate for high bleed air temperatures.
Primary Channel Failure
- In the avionics ventilation system, a primary channel failure in the pack controller leads to a switchover to the secondary channel.
Secondary Channel Failure
- In the avionics ventilation system, a secondary channel failure in the pack controller leads to a complete loss of cooling.
Hot Air Pressure Reg. Valve Failed Open
- In the avionics ventilation system, if the hot air pressure regulator valve fails open, it results in loss of cooling.
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