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Under what conditions would High Pressure (HP) air be used?
- • Descent
- • Other low power setting operations
FCOM, VOL 2. 2.40.1
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Under what conditions would Intermediate Pressure (IP) air be used?
• High power setting operations.
FCOM, VOL 2; 2.40.1
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The Engine Bleed Air Switches control which valves by system logic, when bleed air pressure is available?
- • Engine bleed air valve
- • PRV
- • HP bleed valve
FCOM, VOL 2; 2.10.31
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Describe the general function of pressure regulating valve (PRV).
• Prevents damage to ducting and equipment downstream, the PRV limits bleed air pressure.
FCOM, VOL 2; 2.40.2 and .1
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How are the engine bleed air valves actuated, and when do they open for forward flow?
- • The bleed air valves are pressure actuated.
- • They remain closed until engine bleed air pressure causes forward flow.
FCOM, VOL 2; 2.40.1
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With the HP valve failed open and the respective bleed air switch OFF, will nacelle anti-‐ice be available?
• No
FCOM, VOL 2; 2.40.2
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An Engine Bleed Air System (SYS) FAULT light indicates what?
- • Bleed air overheat
- • Bleed air overpressure
- • HP bleed valve open when commanded closed
- • PRV open when commanded closed
FCOM, VOL 2; 2.10.31
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What does a bleed duct Isolation (ISLN) VALVE light indicate (amber)?
• Isolation valve position disagrees with switch position
FCOM, VOL 2; 2.10.31
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What prevents reverse air flow into the engine compressor sections during engine start?
• The PRV is positively closed
FCOM, VOL 2; 2.40.1
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What happens if the engine start valve fails to close?
- • Bleed air is isolated from the engine starter
- • The PRV remains closed
- • The engine bleed air valve remains closed.
- • Nacelle anti-‐ice and thrust reverse are not available for the respective engine.
FCOM, VOL 2; 2.40.1; 2.40.2 (thrust reverse)
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What two valves close in the engine if a bleed air overheat is detected?
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What conditions in the engine bleed air system would prevent nacelle anti ice operation when the bleed air switch is ON?
- • The PRV has failed closed, or
- • The PRV has been closed due to a bleed air overheat, or
- • The start valve is not closed
FCOM, VOL 2; 2.40.2
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How would you isolate a bleed air duct section in the event of a bleed duct leak is detected?
- • Close the respective isolation valve
- • Close the engine bleed air valves.
FCOM, VOL 2; 2.40.3
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Do we normally operate with the Isolation Valves open or closed?
• Open
FCOM, VOL 2; 2.40.3
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If the center duct is isolated, how is temperature controlled in all temperature zones?
- • All temperature zones operate in backup temperature control mode
- • Trim air is unavailable.
FCOM, VOL 2; 2.40.3
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With a left or right duct isolated, how would the leading edge flaps extend on the affected side, and what EICAS Advisory message would display?
- • The respective LEF operate electrically in secondary mode.
- • FLAPS PRIMARY (until LEF extended) Ø FCOM, VOL 2; 2.40.3 How does an isolated left or right duct affect the hydraulic systems?
- • The respective hydraulic demand pump 1 or 4 is turned off.
FCOM, VOL 2; 2.40.3
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What two systems use engine bleed air downstream in the engine prior to the engine bleed valve?
- • Nacelle anti-‐ice
- • Thrust reverse
FCOM, VOL 2; 2.40.5 (diagram)
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