IPAS Flashcards

1
Q

What IPAS systems are not temperature regulated?

A
APU
Starter (Cross Bleed + APU)
Engine cooling louvers
Engine Anti-ice
Utility Receptacle
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2
Q

When does the SP command the Engine PRSOVs open?

A

80% Ng (SP will not override crew selection)

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3
Q

When does the SP command Engine PRSOVs close

A

Engines transition to 80% Ng or APU is on. (SP will override crew selection)

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4
Q

Describe manual bleed air control.

A

SP (receives signal via DP/MUX) - sends command to ELC1/2 (ENG1/2) - monitors ELC - returns fault or sends to DP for MPD

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5
Q

How is the engine PRSOV monitored

A

two position electrical switch monitored by ELC

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6
Q

Inlet Anti-Ice Valve operation

A

solenoid energized closed. failed open 8 psi

no power and no pressure valve is closed.

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7
Q

Fuel Boost Pump valve operation

A

28vdc
electrical position indicator
energized open
failed closed

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8
Q

Fuel system pressure regulator psi? Location?

A

19 +/- 3

On the deck near the low pressure manifold

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9
Q

3 components of the ice detector system?

A

Ice detector sensor
Ice detector signal processor
Ice detector air shut off valve

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10
Q

Engine PRSOV psi?

A

45 - 55 psi

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11
Q

Explain engine PRSOV operation.

A

2 solenoids (on/off and start)
normal ops - both energized
cross-bleed ops - only on/off is energized (27.5 - 35 psi)
28 Vdc switch for on/off monitoring
Downstream (flow sense) pressure connection
operates pneumatic actuator to maintain pressure.

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12
Q

Describe ATS starter function.

A

28 Vdc energizes a solenoid that off seats a ball allows pressurized air through a check valve and reference valve for constant pressure to actuator (butterfly valve)
Single stage axial turbine

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