EEC

Question 1

EEC

What does the EEC use in normal mode to calculate N1 thrust rating

Answer 1

Sensed flight conditions

Bleed air demand

Question 2

EEC

If required signals are not available to operate in normal mode what happens

Answer 2

Automatically changes to soft alternate mode

Question 3

EEC

Describe soft alternate mode

Answer 3

Uses last valid flight conditions to define engine parameters

Thrust rating shortfalls or exceedances may occur as flight conditions change

EEC estimates Mach number

Remains engaged until idle thrust is commanded or by manually selecting ALTN with the EEC switch.

Question 4

EEC

Hard alternate mode description

Answer 4

Hard alternate mode thrust always equal to or greater than normal mode thrust for same lever position

Uses internal software table to calculate Mach number thrust rating

N1 or EGT exceedances possible during hot day conditions

Question 5

EEC

Approach idle description

Answer 5

The higher N1/N2% improves engine acceleration time in event of a go-around.

Active in flight if flaps in landing config or eng anti ice ON for either engine.

Approach idle maintained until touchdown

If a fault prevents EEC from receiving flap or ant ice signals approach idle schedule begins below 15,000ft MSL

Question 6

EEC

Does the EEC provide N1/N2 redline over speed protection and EGT redline exceedance protection?

Answer 6

Provides N1/N2 redline over speed protection in both normal and alternate modes

DOES NOT provide EGT redline exceedance protection. MUST be monitored by crew

Question 7

EEC

During battery start when do the EECs start to operate?

Answer 7

EEC

15% N2

Question 8

EEC

What does the EEC Monitor

Answer 8

The EEC monitors auto throttle and flight crew inputs to automatically set engine thrust.