AIR CONDITIONING / PRESSURISATION M11.4 Flashcards
How does the ozone converter work?
Catalytic action
How does a coalescer-type water separator work?
It encourages the water to form large droplets that can be centrifuged out of the air
In which part of the vapour cycle machine is the heat energy discharged to the atmosphere?
In the condenser
Which is true for an aircraft that is on the ground and the pressurisation system is in ground mode?
The outflow valves are commanded to the fully open position
How is the pressure in an aircraft’s cabin regulated?
By the outflow valves regulating the amount of air leaving the cabin
What happens in the pressurisation system at aircraft touchdown?
The cabin pressure controllers swap roles and the outflow valves fully open up
What happens in the event of excessive cabin positive pressure?
Safety valves open to allow pressure to bleed away
What happens when cabin pressure exceeds 15,000ft?
The outflow valves are completely closed independent of the normal control system
Which circuit defends the air conditioning system from duct overheat in the event of component failures of mis-control in manual mode?
The protection circuits of the zone-temperature control system
How is ozone in the air supplied to the air conditioning system?
The ozone converter incorporates a catalyst that converts the ozone to harmless oxygen
What is the purpose of the bleed valve?
To regulate engine bleed air supply
How is the quantity of air entering the cabin regulated?
By the pack valve
How is the cooling of the air achieved in the air cycle machine?
By the heat exchangers and the turbine
What is true regarding cabin pressure controllers?
There are 2 controllers- 1 is active and 1 is on standby at all times
What does the cabin pressurisation system safety-device protect the fuselage structure from?
High positive delta-P, and negative delta-P
