ECS

Question 1

Bleed Air Source

Answer 1

APU or ENG, depending on switch position

APU will always provide bleed air if on

Question 2

Torque Reduction/Fuel Flow

Answer 2

Witch ECS on and FLOW in NORM, max torque available reduced by 4% per engine and fuel flow increase by 8 pounds per hour

With TEMP HOT and OAT below 15*, max torque avail reduced by 5% per engine

With FLOW in HIGH, max torque avail reduced by 7% and fuel flow increases to approx 45 pounds per hour per engine

Question 3

Manual Mode

Answer 3

Requires pulsing of the HOT-COLD toggle switch followed by a waiting period to judge the magnitude of temperature change. Excessive input may cause ECS shutdown and/or APU failure

Question 4

Auto Shutdown

Answer 4

1. C-Power selected
2. No 1 or No 2 starter engaged
3. ECS heating duct overtemperature exists

Question 5

Auto Shutdown with AIR SOURCE ECS/START switch placed to ENG

Answer 5

1. TGT of 851* reached
2. Either ENG ANTI-ICE ON
3. DE-ICE MASTER ON and ice is detected
4. ECS underpressure situation exists