07 - Engines, APU

Question 1

ENGINES, APU
1. Which system regulates the engine?

Answer 1

A dual-channel Electronic Engine Control (EEC)

Question 2

2. What is the indication an EEC is operating in normal mode?

Answer 2

White ON lights are the only lights illuminated on the associated EEC switch on the engine panel

Question 3

3. What are the indications of EEC hard alternate and soft alternate modes?

Answer 3

• In Soft Alternate mode, the amber ALTN switch illuminates and the white ON indication remains visible.
• In Hard alternate mode, only the amber ALTN remains illuminated.

Question 4

4. The EECs provide redline overspeed protection for which engine parameters(s)?

Answer 4

N1 & N2

Question 5

5. When do the EECs select approach idle for the operating engine?

Answer 5

• With flaps 15 or greater, or
• Any time the flaps are not fully retracted and engine anti-ice is on

Question 6

6. What does the ENGINE CONTROL light indicate and when is it armed?

Answer 6

A non-dispatchable fault in the EEC. It operates when;
- the respective engine is operating,
- aircraft on the ground, and
- below 80 kts prior to takeoff, or 30 seconds after touchdown

Question 7

7. When is the ENG FAIL alert displayed?

Answer 7

• The respective engine is operating at a condition below sustainable idle (63% N2), and
• the engine start lever is in the IDLE position

EXTRA CREDIT: for the NG, it’s below 50% N2

Question 8

8. How are the secondary engine instruments toggled?

Answer 8

ENG is selected on the Multi-Function Display panel

Question 9

9. How are EGT redline exceedances indicated?

Answer 9

The digital readout, box, needle, and indicator change to red

Question 10

10. How is an EGT exceedance displayed after engine shutdown?

Answer 10

A box the color of the exceedance (red or amber) displays around the digital readout where the exceedance occurred

Question 11

11. How is the N1/SPD REF SET page displayed on the Max Display System?

Answer 11

By selecting INFO on the MFD panel on the forward electronic panel

Question 12

12. What does the THRUST crew alert on the Engine Display indicate?

Answer 12

The associated engine thrust is more or less than the commanded thrust.
Displayed in conjunction with N1 command sector illuminating amber

Question 13

13. What are the indications of reverse thrust on the Engine Display?

Answer 13

• Amber REV indicates the associated thrust reverser is moved from stowed position
• Green REV indicates the thrust reverser is deployed

Question 14

14. What does selecting FUEL USED display?

Answer 14

Fuel used since the last reset

Question 15

15. What does the illumination of the FUEL FLOW crew alert indicate?

Answer 15

Fuel flow is abnormally high when compared to the FMC-expected fuel flow

Question 16

16. What does the illumination of the OIL FILTER BYPASS light indicate?

Answer 16

Impending bypass of oil supply filter

Question 17

17. Which engine start ignitor is available on standby power?

Answer 17

Right

Question 18

18. The auto-relight function of the Engine Start System is available when the engine start switches are in which position(s)?

Answer 18

Any position

Question 19

19. What does MOTORING on the N2 indicator indicate?

Answer 19

Bowed Rotor Motoring is active

Question 20

20. Which start malfunction(s) do the EECs monitor for during engine start?

Answer 20

• Impending hot starts
• engine stalls
• EGT start limit exceedances
• wet starts

Question 21

21. How is an impending hot start indicated during engine starting?

Answer 21

White box surrounding the EGT digital readout flashes white

Question 22

22. What does the illumination of the REVERSER LIMITED light indicate?

Answer 22

• In flight; a fault in the thrust reverser system that limits reverse thrust. Thrust reverse will not deploy or will be limited to idle
• On ground; indicates a malfunction has occurred

Question 23

23. What does the illumination of the REVERSER COMMAND light indicate?

Answer 23

The reverse thrust lever is not in the down position in flight

Question 24

24. What does the APU provide?

Answer 24

Electric and pneumatic power on ground and in flight.
- Bleed air up your 17,000’
- Electric up to 41,000’
- Both up to 10,000’

Question 25

25. Does the APU require the BAT switch to be on to operate?

Answer 25

Yes

Question 26

26. How long should the APU run after illumination of the APU GEN OFF BUS light before opening the APU bleed valve?

Answer 26

2 minutes

Question 27

27. How long should a pilot wait after the APU switch is selected OFF before selecting the BAT switch OFF?

Answer 27

NG - 2 minutes MAX - 5 minutes (it's after APU GEN OFF BUS light extinguishes...not just after flipping the APU switch OFF!) (FH 3.150 p6)

Question 28

28. What will cause the automatic shutdown of the APU?

Answer 28

• RPM overspeed conditions • low oil pressure • high oil temperature • APU fire • Fuel Control Unit failure • EGT exceedance, and • other system faults monitored by the ECU EXTRA CREDIT: - Turning BAT switch OFF

Question 29

EXTRA CREDIT What does it mean when this light is blinking?

Answer 29

- Uncommanded opening of the start valve Or - Failure of the start valve to close after engine start

Question 30

EXTRA CREDIT What does this APU DOOR LIGHT light indicate?

Answer 30

APU door is not in the commanded position, such as: • APU door is open when APU is shut down (air or ground) • Door is not in flight position when airborne • Door is not in ground position when on the ground