04 - Automatic Flight

Question 1

AUTOMATIC FLIGHT

1. From left to right, what are the three Flight Mode Annunciator (FMA) categories?

Answer 1

A/T / Roll / Pitch

SH 4.010 pg3 (Rev 6)

Question 2

AUTOMATIC FLIGHT

2. How is control wheel steering indicated?

Answer 2

By display of CWS mode annunciation above the A/P status display and CWS R and/or CWS P, as appropriate, on FMA (with white box flashing for 10 sec).

SH 4.010 pg2 (Rev 6)

Question 3

AUTOMATIC FLIGHT

3. How is independent flight director operation indicated?

Answer 3

Illumination of both MA lights

SH 4.010 p7 (Rev 6)

Question 4

AUTOMATIC FLIGHT

4. When do the flight directors operate independently?

Answer 4

Both FD switches ON, in Manual flight, and

• TO/GA mode engaged below 400 ft RA,
  or
• APP mode engaged with LOC and GS captured

SH 4.010 p7 (Rev 6)

Question 5

AUTOMATIC FLIGHT

5. Except for when APP modes (LOC/GS) are active, how many autopilots may be engaged at once?

Answer 5

Only one A/P can be engaged at a time unless the approach (APP) mode is engaged.

SH 4.010 p10 (Rev 6)

Question 6

AUTOMATIC FLIGHT

6. What would cause the A/P to disengage?

Answer 6

• Pushing either A/P disengage switch
• Pushing the A/P DISENGAGE bar down
• Column or wheel force override
• Activating either pilot’s control wheel trim switch
• Moving either STAB TRIM PRI or the STAB TRIM B/U cutout switch to the CUTOUT position
• Pushing either TO/GA switch with a single A/P engaged below ft 2,000 RA
• Pushing either TO/GA switch with a single A/P engaged at and above ft 2,000 RA with flaps not up or G/S engaged
• One second after activation of stick shaker if A/P is engaged in ALT HOLD, VNAV PTH (in a level segment), VNAV PTH (Flaps 15 or greater), V/S (Flaps 15 or greater), or G/S (single channel only) modes.
• 5 minutes after continuous activation of stick shaker if not in any of the above modes
• 5 minutes after continuous activation of stick shaker if the A/P was re-engaged
• Pushing either TO/GA switch after touchdown with both A/Ps engaged in CMD
• Either left or right IRS system failure or FAULT light illuminated
• Loss of electrical power or a sensor input
• Loss of respective hydraulic system pressure

SH 4.010 p12

Question 7

AUTOMATIC FLIGHT

7. When will the STAB OUT OF TRIM light illuminate?

Answer 7

• A/P not trimming the stabilizer properly when the A/P is engaged, or
• partial in-flight failure of an FCC after landing and GS less than 30 kts

SH 4.010 p14 (Rev 6)

Question 8

AUTOMATIC FLIGHT

8. What does a flashing amber A/T alert light indicate?

Answer 8

An A/T airspeed error where airspeed differs from commanded value by +10 or -5 kts and is not approaching commanded value in flight with flaps not fully retracted

Question 9

AUTOMATIC FLIGHT

9. Which system provides the N1 limit for the A/T?

Answer 9

In normal operation, the FMC
Otherwise, a boxed white A/T LIM replaces the thrust mode and the EECs provide a degraded thrust limit

SH 4.010 p15 (Rev 6)

Question 10

AUTOMATIC FLIGHT

10. What is the autothrottle mode when the pitch mode is V/S?

Answer 10

Speed (MCP SPD)

Question 11

AUTOMATIC FLIGHT

11. The bank angle selector will limit the angle of bank in which modes?

Answer 11

HDG SEL or VOR

Question 12

AUTOMATIC FLIGHT

12. How are LOC and GS modes armed?

Answer 12

By pushing the APP pb

Question 13

AUTOMATIC FLIGHT

13. When is an altitude deviation alert provided?

Answer 13

At 200 ft from selected altitude

Question 14

AUTOMATIC FLIGHT

14. What does THR HLD on the FMA indicate?

Answer 14

The A/T automatically engages the THR HOLD mode during the takeoff at 84 kts. When THR HOLD is engaged, power is removed from the A/T servo motors preventing thrust levers from moving during the takeoff roll and initial climb out. Two separate functions remove power from the servo motors:
- a software function, and
- a hardware function
Only when both functions have removed power to the servo motors will the A/T mode display THR HLD on the FMA.

Question 15

AUTOMATIC FLIGHT

15. After TO/GA is selected on a two-engine go around, the FD will command an initial pitch attitude of approximately how many degrees?

Answer 15

15 degrees nose up

Question 16

AUTOMATIC FLIGHT

16. On a go-around with the autothrottle armed, after the first push of either TO/GA switch, the thrust levers advance to reduced go-around N1 to produce what rate of climb?

Answer 16

1,000-2,000 fpm

Question 17

AUTOMATIC FLIGHT

17. On a single-engine go-around, a push of either TO/GA switch will command an initial pitch attitude of how many degrees nose up?

Answer 17

13 degrees nose up

Question 18

AUTOMATIC FLIGHT

18. What occurs in minimum speed reversion?

Answer 18

AP disengages and FD bars bias out of view one second after stick shaker activation

Question 19

*EXTRA CREDIT *

AUTOMATIC FLIGHT

19. With the BUS TRANS switch in AUTO, what occurs automatically with the DC cross bus tie relay when Glide Slope is active on a FD or AP ILS approach?

Answer 19

The DC cross bus tie relay opens, thus DC bus 1 and DC bus 2 are isolated and are powered by their respective TR unit.

SH 6.010 p16

Question 20

*EXTRA CREDIT *

AUTOMATIC FLIGHT

20. With LNAV selected for takeoff (armed) and the engagement criteria met, at what altitude does LNAV become engaged?

Answer 20

50ft AGL

SH 4.010 p3 & FH 3.070 p8