737 Engines and APU

Question 1

What is the purpose of the Electronic Engine Control (EEC)?

Answer 1

N1 thrust limits
Redline protection: N1 & N2 overboost and EGT protection during ground starting only
Minimum Idle power settings

Question 2

Above the N1 on the upper display indicator is a REV indicator. What is the color logic of this indication?

Answer 2

(amber) REV = Reverser sleeve moves from the stowed position (in transit or disagree)
(green) REV = Thrust reverser is deployed properly & can be raised to detent 2

Question 3

How do you display the Fuel Used?

Answer 3

Fuel Flow Switch: Reset / Rate / Used

Question 4

What is indicated by the ENGINE CONTROL light?

Answer 4

Illuminates when the EEC detects faults in the Engine Control System that are not dispatchable. The light is functional when all of the conditions listed below:
- a no dispatch engine fault occurs
- engine is operating (N2 is greater than 50% with start lever in IDLE)
- aircraft on ground:
• groundspeed is below 80 kts prior to takeoff
• approximately 30 seconds after touchdown

Question 5

Is it dispatchable? (ENGINE CONTROL light?)

Answer 5

NO

Question 6

Which light(s) indicate the EECs are in Normal Mode?

Answer 6

ON (white)

Question 7

What indicates an EGT exceedance after engine shutdown?

Answer 7

Red Box around the EGT digital readout

Question 8

How is a hot start indicated during ground starting?

Answer 8

Flashing white EGT value

Question 9

Which position(s) does a start switch need to be in for both igniters to activate in case of an engine flameout?

Answer 9

ANY position

Question 10

When do the EECs select approach idle with Engine Anti-Ice on?

Answer 10

Engine anti-ice selected on for either engine, or

Flaps in the landing configuration

Question 11

The EECs provide redline protection for which parameters?

Answer 11

N1 and N2 and EGT (on ground only during start)

Question 12

EECs will abort an engine start for which start malfunctions?

Answer 12

ll start malfunctions (on the ground) except a failure of the start valve (START VALVE OPEN annunciator will stay ON)

Question 13

What causes the ENG FAIL alert on the N2?

Answer 13

Below 50% N2

Question 14

What does the APU provide?

Answer 14

Auxiliary AC power source & bleed air for engine starting and air conditioning

Question 15

What powers the APU Electronic Control Unit?

Answer 15

Battery
Switched Battery Bus
*Turning the Battery Switch to OFF will shut down the APU

Question 16

How long must you wait before turning the battery off after the APU is shut down?

Answer 16

2 minutes

Question 17

Will the APU start without battery power?

Answer 17

NO

Question 18

What will cause the automatic shutdown of the APU

Answer 18

• Overspeed
• Low/high oil pressure
• APU fire
• Fuel Control Unit failure
• EGT exceedance
• ECU faults

Question 19

What indicates a thrust reverser malfunction?

Answer 19

REVERSER and ENG and MASTER CAUTION

Question 20

What causes a REVERSER light?

Answer 20

REVERSER = on while stowing (should go out within 10 seconds) Any time the REVERSER light illuminates for more than approximately 12 seconds, a malfunction has occurred and the ENG annunciator and MASTER CAUTION lights illuminate.

Question 21

With an EEC light in ALTN, thrust lever not in IDLE, what mode is the EEC in?

Answer 21

ON and ALTN on = soft alternate mode

Question 22

What system controls maximum thrust ratings?

Answer 22

EEC - Electronic Engine Control