Air Condition Flashcards
Light Aircraft Pneumatic Source
Small engine driven vacuum pump used to generate supply for instruments and de-icing boots.
What is a possible pneumatic source in a single engine piston aircraft?
Compressor pump AND Inlet manifold.
Advantage of air over hydraulics
Plentiful supply, lighter, no reservoir.
Disadvantage of Air Systems
High Pressure leaks cannot be spotted easily.
Mass Flow Controllers
Fixed mass flow.
Sends signals to spill valves to dump unwanted air if too much.
Sends signals to spill valves to close and stop air from escaping. if not enough.
Purpose of the Choke Valve
Raise the temperature of air if required.
How does the choke valve raise the temperature of the air?
Applies a back pressure to the blower.
Where does air come from?
LP stages of the HP Compressor.
Flows to the pack valve (either ON or OFF), goes to aircraft packs, cooled down and dehumidified.
Isolation Valve
Isolate Pack 1 and 2 from engines.
High Pressure Shut Off Valve
Opens relatively slowly on start-up to prevent surging.
Closes quickly to prevent ingress of fumes and smoke.
What causes over pressure?
Failure of High Pressure Shut Off Valve
Actions upon overheat?
Close bleed switch and open isolation valve to make up for lost system.
Where does the risk for carbon monoxide come from in light aircraft?
The heat exchanger.
Purpose of Air Conditioning
To supply a constant delivery of clean air to the cockpit and cabin, within a set temperature range.
What is conditioned air?
Air which is treated for pressure and temperature.
HUMIDITY is NOT controlled.
