ECS Flashcards

1
Q

What does the hot gas bypass valve do?

A

Allows high pressure hot gas to the suction (low pressure) side to maintain pressures. (cracks at 31-33 / full at 27-29)

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2
Q

What does the quench value do?

A

Uses R-134 to cool hot gas from the return (suction). Maintains temperature of gas returning to compressor. (45-75 F)

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3
Q

How many temperature sensors are in the ECS system?

A
24 Total (range -67 - 300 F)
2 on the compressors (low side + high side) [4]
2 on each EFAB evaporator ( air supply + return) [8]
2 on each condenser (intake + exhaust)  [4]
4 in each crew station (supply + return)x2 alt  [8]
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4
Q

How much moisture does the demister remove?

A

15%

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5
Q

When do you get an FWD/AFT LFAB/RFAB HOT msg?

A

Supply sensor >80 for 5 sec (aircraft power for 10 min) Squat switch AIR or GROUND

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6
Q

What does EFABS HOT mean?

A

2 or more specific EFABs are HOT

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7
Q

What does ECS DEGRAGED FWD/AFT mean?

A

Failure in DCU, Compressor, Condenser fans, EFAB fans, CPG fan, APS fan, or CPG TCV.

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8
Q

When will the heat shutoff value never close?

A

Ambient temperature

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9
Q

What does ECS FWD/AFT FAIL mean?

A

ECS1/2 MUX is not available after power on for 120(fwd) or 240(aft) compressor and/or condenser is disabled.

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10
Q

What does ECS FAIL mean?

A

Both ECS FWD and AFT FAIL are set.

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11
Q

Which ECS comes on first during start up?

A

ECS2

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