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What is the primary air source when both engines are operating?
bleed air from both engines
What are the users for IPAS air?
- 1. air turbine starter(ats)
- 2. environmental control system(ecs)
- 3. canopy defog
- 4. louver actuators(engine firewall/cooling)
- 5. air pressure regulating valve
- a. fuel boost pump
- b. fuel transfer pump
- c. external fuel tanks
- 6. hydraulic resevoirs
- 7. utility receptacle
- 8. nitrogen inerting system
- 9. ice detector probe
Where is the low-pressure venturi located?
it is mounted directly of the engines at the low pressure bleed air port and connects to the IPAS ducting leading to engine bleed air PRSOVs.
What does the load control valve do?
allows APU bleed air into the IPAS manifold after the APU reaches 95% speed.
The fuel system pressure regulator valve reduces the IPAS pressure down to _______ for use by the fuel boost pump, fuel transfer pump, and auxillary fuel tank/shutoff air valve.
19 + 3 psig
What do the high pressure check valves prevent?
backflow of the 5th stage bleed air from engine to engine
IPAS air exits the engines at _____ psig and is reduced to _____ psig by the hydraulic resevoir pressure regulators for the primary and utility hydraulic resevoirs.
31 + 3
How are the engine PRSOVs commanded to open or close?
A/C UTIl page BLEED AIR 1 and 2 buttons
What would cause the following UFD message:
BLD AIR OFF
This message occurs when engine 1 and 2 bleed air sources have been manually shut off
EP: BLEED AIR HOT
Identify high tgt engine and turn off affected bleed air
Whose in charge of what side of the house?
APU only: Engine - high/low APU - high/low
After engine start (101% NP): Engine - high/low APU - high/low
APU shutdown: Engine - high/low APU - high/low
- APU only: APU high/low
- After engine start: engine high apu low
- APU shutdown: engine high/low
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