EEC Flashcards
What does EEC use as controlling parameter?
N1
Action taken prior to manual selection of EEC?
Decrease thrust lever position. Thrust increases on a manual selection but not when done automatically by the EEC.
What occurs in the A/T system w/EEC changed to manual mode?
A/T disconnect. Can be reconnected when all EEC’s have been changed to alternate mode.
What feature of EEC provides overspeed protection?
Fuel metering via the Fuel Metering Unit
When does EEC select approach idle?
- Flaps in landing position - Continuous IGN ON - During Thrust Reverser Operation
How long is approach idle maintained after touchdown?
5 seconds
What are the two EEC control modes?
Normal and alternate
EECs powered by?
Alternator on accessory gearbox
With regard to the EEC, the max rated thrust available from engine is represented by?
N1
When does EEC transfer to alternate mode?
If fault detected and EEC can no longer control engine in normal mode.
Two ways to enter EEC alternate mode?
- Failure of Normal mode - EEC Mode Switch
What are 2 EEC idle modes?
Approach and Minimum
Primary purpose of EEC approach idle mode?
Decreases acceleration time for a go-around.
What does EEC do to prevent overspeed?
Monitors N1/N2 RPM and command FMU to reduce FF regardless of thrust lever command.
EEC ALTN Mode will not prevent what condition?
Thrust Limiting at Max N1 * Max N1 is reached at a thrust lever position LESS THAN FULL FORWARD. Thrust levers must be adjusted to maintain a desired thrust as environment conditions and bleed requirement (anti-ice) change. (FCOM 7.20.4)
