PNEUMATIC
1. Which are the three main sources of high-pressure air for the pneumatic
system?
High pressure air is supplied from three sources :
- Engine bleed systems
- APU load compressor
- Two HP ground connections.
Page1987
2. How is each engine bleed valve operated and controlled?
Each bleed valve is electrically controlled by its associated BMC and pneumatically
operated.
Page1989
3. An aircraft is in climb, and the following conditions occur simultaneously:
Engine Bleed Valve Closure Logic
4. Under what conditions does the APU bleed valve supply air to the pneumatic
system?
Air supplied by the APU load compressor is both available on ground and in flight.
APU bleed air is controlled by the APU bleed valve ,provided APU N is greater than
95 %
Page1993
5. What is the primary purpose of the cross-bleed valve on the crossbreed duct?
This valve enables the isolation or interconnection of the LH (ENG 1 and 2) and RH
(ENG 3 and 4) air supply system.
Page1997
6. During climb, the following occurs simultaneously:
Pneumatic Leak Detection Scenario
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