Engines EICAS EEC

Question 1

Engines

Answer 1

GE90-115B

Rated at 115,540 lbs Thrust

Question 2

N1 Rotor consists of

Answer 2

Fan
Low pressure compressor section
Low pressure turbine section

Question 3

N2 rotor

Answer 3

High pressure compressor section
High pressure turbine section
N1 and N2 rotors are mechanically independent

Question 4

EGT amber band

Answer 4

Max continuous EGT limit
Turns amber if EGT enters amber band
During takeoff and go around the amber band exceedance indications are inhibited for 5minutes after EGT enters rather amber band

Question 5

Exceedance of secondary engine indications

Answer 5

Display will display automatically on the lower centre MFD

If lower MFD fails, will come up on compacted MFD upper

Question 6

Engine EECs

Answer 6

Each engine is monitored and controlled by a dual channel electronic engine controller

Receive info from thrust levers

Question 7

Thrust modes

Answer 7

TO- Max rated takeoff thrust
TO 1-Fixed derated 1 take off thrust, less than TO thrust
TO 2- FIxed derated 2 TO thrust, a larger derated than TO 1
D-TO- Assumed temp derated TO thrust
DO-TO 1
DO-TO 2

Question 8

EECs two modes

Answer 8

Normal and alternate

Question 9

Normal mode

Answer 9

Thrust set based on thrust lever position, the EEC commands the fuel metering unit to adjust fuel flow until actual N1 equals commanded N1

Question 10

EEC protection

Answer 10

N1 limit

Over speed

Question 11

Idle modes

Answer 11

Min idle

Approach idle higher thrust

Question 12

Approach idle automatically selected in flight

Answer 12

Engine anti ice on
Flaps commanded to 25 or greater
C1 or C2 hydraulic demand pump inop and flaps are out of up
Opposite engine bleed air valve is closed

Question 13

Fault in EEC

Answer 13

Automatically switches to alternate mode (soft alternate mode because the switch is still in the normal positin)

Question 14

Hard alternate mode

Answer 14

EEC mode switch selected to ALTN mode manually

Question 15

ENG EEC Mode msg

Answer 15

EICAS MSG

Displays when alternate mode is selected automatically or manually

Question 16

Alternate mode

Answer 16

No thrust limit protection in either soft or hard alternate modes
Before engaging, disengage AT and reduce thrust
Max thrust in hard= reached at thrust lever psn less than full

Question 17

Eng idle disagree

Answer 17

One thrust lever in aprroach idle and one in minimum idle