EEC ***

Question 1

What is EEC and what it mean?

Answer 1

” Electronic Engine control”

• It has Full authority over Engine operation
• Use thrust Lever inputs to control Forward and reverse trhrust

Question 2

What does the EEC use as the controlling parameter (GE)?

Answer 2

• N1

• Calculate N1 values between idle and maximum N1

Question 3

What is provided in the EEC Normal mode?

What protection features are provided during engine Ground starts by the EEC?

Answer 3

• Thrust limiting
• Maintains constant thrust, independent of outside air temperature and pressure.
• Compensates for bleed requirements
• Overspeed protection

On the ground, prior to the starter valve cutout:
Recognizes:
No start.
Hot start.
Hung start.
Attempts 3 re-starts automatically, then motors for 30 seconds.

On the ground, after the starter valve cutout:
Recognizes:

Hot start.
Compressor stall.

The EEC will execute an immediate abort.
The EEC executes continuous re-start attempts.

Question 4

What action should be taken prior to manual selection of EEC alternate mode?

Answer 4

• Decrease thrust lever position. Thrust increases when alternate mode is selected manually.

Thrust does not change when the EEC transfers control from normal mode to alternate mode.

Question 5

What occurs in the autothrottle system when any EEC control is changed to alternate mode?

Answer 5

• The autothrottles disconnect but can be reconnected when all EECs have been changed to alternate mode.

Question 6

What EEC normal mode protection feature is not available in EEC Alternate mode?

Answer 6

• Thrust limiting at maximum N1 (maximum thrust can be achieved prior to thrust lever position at full forward)

Question 7

What feature of the EEC provides overspeed protection?

Answer 7

• Fuel metering unit

Question 8

When does the EEC select approach idle?

Answer 8

• Flaps in a landing position
• Continuous Ignition switch is ON
• During thrust reverser operation 5 seconds
• Nacelle anti-icing is on

Question 9

How long is approach idle maintained after touchdown?

Answer 9

• 5 seconds

Question 10

What are the maximum N1 and N2 limits?

Answer 10

N1 – 117.5% N2 – 112.5%

Question 11

What Color is the Reference N1 indicator on the EICAS

Answer 11

Green

Question 12

What Color is Command N1 indicator on the EICAS

Answer 12

White

Question 13

What color is Maximum N1 (trhust limit) Line on the EICAS

Answer 13

Amber

Question 14

What color is the N1 RPM operating limit on the EICAS

Answer 14

red

Question 15

Do the Aborted Engine start checklist for

Answer 15

• No N1 rotation by idle N2(62-67%)

- Non-normal oil pressure indication by idle N2(62-67%)

Question 16

For manual start refer to

Answer 16

Supplementary procedures 7.6

Question 17

What is the Electrical power for EEC

Answer 17

Electrical power for each EEC is provided by an alternator mounted on the engine accessory gearbox.