IPAS

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Author:
hankbautzmann
ID:
61014
Filename:
IPAS
Updated:
2011-01-20 21:12:11
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  1. What is the primary air source when both engines are operating?
    bleed air from both engines
  2. 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
  3. 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.
  4. What does the load control valve do?
    allows APU bleed air into the IPAS manifold after the APU reaches 95% speed.
  5. 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
  6. What do the high pressure check valves prevent?
    backflow of the 5th stage bleed air from engine to engine
  7. 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.
    200

    31 + 3
  8. How are the engine PRSOVs commanded to open or close?
    A/C UTIl page BLEED AIR 1 and 2 buttons
  9. 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
  10. EP: BLEED AIR HOT
    Identify high tgt engine and turn off affected bleed air
  11. 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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