Pneumatics Flashcards
Cabin differential pressure means the pressure difference between?
Cabin pressure and Ambient air pressure.
The bleed-air pressure gauge on the flight deck shows the bleed air pressure relative to?
Atmospheric static pressure.
The main function of an air cycle machine is to?
Cool the bleed air.
In normal operation the maximum cabin altitude for transport aeroplanes is?
8000 ft
On a typical gas-turbine-engine aircraft, the pneumatic air bleed system uses air supplied from the engine?
Compressor.
If the maximum certified altitude of an aeroplane is limited by the pressurised cabin, this limitation is due to the maximum?
Positive cabin differential pressure at maximum cabin altitude.
The maximum cabin differential pressure of an aeroplane with a maximum certified altitude of 41 000 ft is approximately?
9.0 psi
A cabin pressure controller maintains a pre-set cabin altitude by regulating the?
Position of the outflow valve/valves.
The pack cooling fan provides?
Cooling air to the primary and secondary heat exchanger during slow flight and ground operation.
On most large aeroplanes, the cabin pressure is controlled by regulating the?
Airflow leaving the cabin.
A commonly-used refrigerant in a Vapour Cycle Air Conditioning System is?
Freon
On large pressurised jet transport aeroplanes, the maximum cabin differential pressure is approximately?
5-10 psi.
Assuming cabin pressure decreases, the cabin rate of climb indicator should indicate?
A rate of climb.
A warning will be given if the cabin altitude exceeds?
10,000 ft
In a bootstrap cooling system, the bleed air is compressed to?
Ensure an adequate temperature drop in the secondary heat exchanger.
During level flight at a constant cabin pressure altitude, the cabin outflow valves are?
Partially open.
the term bootstrap, when used to identify a cabin air conditioning and pressurisation system, refers to the?
Air cycle machine.
In an air cycle machine (bootstrap system), the main water separation unit is located?
After the cooling turbine
The cabin differential pressure is?
Cabin pressure minus ambient pressure.
In an aircraft’s pressurisation system, excessive cabin pressure would normally be alleviated automatically by the?
Opening of a positive pressure relief valve.
The cabin pressure altitude of a large aeroplane will not normally exceed?
8000 ft
