11.4 Air Conditioning Flashcards
How does the ozone converter work?
Catalytic reaction
How does coalescer type water separators work?
By encouraging water to form large droplets that can be centrifugalalised out of the air.
Which is true for an aircraft that is on the ground and pressurisation is in the ground mode?
Outflow valves commanded to the fully open position
How is the pressure in an aircraft cabin regulated?
By the outflow valves regulating how much air is leaving the cabin.
What happens in the pressurisation system at aircraft touchdown?
The cabin pressure controllers swap roles and the outflow valves are driven to the fully open position.
What happens in the event of excessive cabin positive pressure?
Safety valve opens to bleed the pressure away.
What happens when the cabin altitude exceeds 15,000ft?
Outflow valves completely close independently of the normal system.
Which circuit defends the air con system from the duct overheat in the event of compartment failures of mis-control in manual mode?
The protection circuits of the zone temp control system.
Which condition of air is ideal for pneumatic system?
Air at constant pressure and temp
In what condition is the air arriving at the air condition packs normally?
Approx 200 degrees c at 45psi
Consider the very low temp of air leaving the air cycle machine, how is it possible to prevent water from freezing in the system?
Water separator located upstream of the cooling pack.
How is the quantity of air entering the cabin regulated?
A pack valve
Which climb mode of pressurisation is usually more comfortable for passengers?
External mode
Which devices are installed to prevent damage to the structure in the event of sudden depressurisation?
Equalisation valves allow pressure in various zones to equalise.
How is o zone in the air supplied to the air conditioning system treated?
O zone converter incorporates a catalyst that converts o zone to harmless oxygen.
