ECS and Anti-G Flashcards
The APU can supply air to the ECS. When is the air supply from the APU inhibited?
When the engine is operated at more than idle speed.
OR
The ECS is shut down due to an overpressure condition.
What effect does turning the Cabin Conditioning switch to Off have on the ECS PRSOV and ram air valve?
The PRSOV is closed, which cuts off air supply to the ECS.
The ram air valve is opened.
What position will the ECS PRSOV and ram air valves be in when the Cabin conditioning switch is set to NORMAL, DEMIST or FLOOD?
PRSOV: Open
Ram air valve: Closed.
Where are the ECS heat exchanger air intakes and exhausts located?
On the top of the centre fuselage - the intakes are the “teddy bear ears” behind the canopy.
What will happen if an overpressure is detected downstream of the ECS PRSOV?
The system will close the PRSOV and open the ram air valve.
When is ram air automatically provided to the cabin?
When:
Weight on wheels.
Cabin Conditioning switch set to Off.
ECS is automatically shut down due to an overpressure.
At what altitude does pressurisation begin?
5000ft.
What valves are involved in controlling cabin pressurisation?
A pressure controller and discharge valve on the forward bulkhead.
A slave discharge valve (slaved to the controller and discharge valve) on the aft seat frame.
A safety and inward relief valve on the forward seat frame.
Where does the pressure controller receive its pressurisation information from?
The pitot/ static probe.
What will activate a CPR caption?
If the cabin altitude is more than 24,000ft or the cabin conditioning switch is set to Off.
State the rule for what cabin pressure to expect at various altitudes.
At altitude 10,000ft, cabin alt is approx: 1/2 +3 (8000ft)
20,000ft: 1/2 + 2 (12,000ft)
30,000ft: 1/2 +1 (16,000ft)
40,000ft: 1/2 (20,000ft)
