Pneumatic Systems Flashcards
(16 cards)
What pressure is measured at the pito tube?
Total pressure.
What does pneumatic mean?
Air sensing or driving.
What air the three sources of compressed air for a gas turbine?
Bleed air from engines - compressed air from the APU - compressed air supplied by a ground power unit.
Bleed air passes through a high pressure shut off valve. What pressure does it reduce to?
100psi.
What does a ground power unit provide?
Bleed air.
What is an overheat detector called in a pneumatic system and how many are there per zone of the airframe?
2 loops
The main function of an air cycle machine is to cool the blank blank.
Cool the bleed air.
Engine bleed air used for air conditioning and pressurisation in turbo-jet aeroplanes is usually taken from the…
Compressor
The source of air to pressurise the reservoir of an aircraft’s hydraulic system is normally… blank from the compressor
Bleed air
In a typical bootstrap cooling system, the supply air is in what order? (Secondary exchanger / compressed / expansion turbine)
compressed, passed through a secondary heat exchanger, and then across an expansion turbine.
If the automatic control of an air conditioning system fails… it needs blank
Manual control
A commonly-used refrigerant in a Vapour Cycle Air Conditioning System is…
Freon
The air source for the vapour-cycle machine in a piston engine airplane is… the blank of a turbocharger
Compressor
Bleed air systems use a (1) _____, which normally stays (2) _____. (Non return valve / isolation valve) (CLOSED/OPEN)
isolation / closed
In comparison with the use of a conventional bleed air pneumatic system, an aircraft fitted with an electrical pneumatic system has… an increased blank
Range
During level cruising flight, an aeroplane experiences a malfunction of the pressure controller. If the cabin vertical speed indicator reads 200 ft/min rate of descent…the differential pressure will increase/decrease thus causing the safety relief valves to open/close.
Increase - open
