AutoFlight

Question 1

What type of autopilot system is utilized on 737?

Answer 1

Dual Autopilot system
- Autopilot A
- Autopilot B

Separate hydraulic systems drive each autopilot.

Question 2

What controls the auto flight system?

Answer 2

It’s controlled by two flight control computers:
- FCC A (direct autopilot A)
- FCC B (directs autopilot B)

Question 3

From what sources does the Flight control computers (FCC’s) process inputs from?

Answer 3

Mode Control Panel (MCP)
Flight Management Computers (FMCs)
Auto throttle system
Control column/wheel position
Autopilot actuator position

Question 4

The FCC’s provide commands to what in addition to flight guidance?

Answer 4

Speed trim
Mach trim
Altitude alert
A/P Warning

Question 5

After the APP light extinguishes (from capturing the approach), the APP mode can only be disengaged by?

Answer 5

• Pushing a TO/GA switch
• disengaging the autopilot and turning off both flight directors.
• Selecting a different frequency in one of the VHF NAV receivers.

Question 6

How is an autothrottle mode activated?

Answer 6

• Manually electing the desired mode on the MCP
• Allowing the auto flight system to select the proper mode
• Pressing either TO/GA switch

Question 7

What does the white A/T LIM display above the N1 indications mean?

Answer 7

It displays when the FMC is not providing limits to the autothrottle system or
The system is using degraded N1 thrust limit from the EEC

Question 8

What are the ways to disengage autopilot?

Answer 8

-Pressing either A/P Disengage switch
-Pushing an illuminated A/P Engage switch
-Pushing down the A/P DISENGAGE Bar
-Activating either pilots control wheel Stabilizer Trim switch
-Moving the STAB TRIM AUTOPILOT cutout switch to CUTOUT
-to/ga w a/p in cws or cmd below 2,000 ft RA
-to/ga w a/p in cws or cmd above 2,000 ft with flaps not up or G/S engaged

Question 9

When will the autopilot automatically disengage?

Answer 9

Either IRU fails
Hydraulic failure
Electrical failure
Sensor failure

Question 10

A/P Disengage light illuminates steady red for what conditions?

Answer 10

1. ALT ACQ mode inhibited during A/P go-around if not trimmed for single A/P operation.
2. When the disengage light test switch is held in position 2, or when the automatic ground system test fails.

Question 11

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Question 12

Automatic A/T disengagement happens for?

Answer 12

System fault
Thrust lever separation
Thrust and control wheel displacement

Question 13

The auto flight system provides protection for the following speed limits:

Answer 13

Minimum speed
Vomit/Mmo
Flap placard speeds
Landing gear placard speeds

Question 14

VOR LOC mode is disengaged by:

Answer 14

Selecting a different roll mode
Changing frequencies on the respective nav radio
NAV signal is lost

Question 15

Pushing TO/GA for take off roll does what?

Answer 15

• after N1 is stabilized at 40% , advanced thrust levers to takeoff N1 setting
• Flight director commands a wings level attitude and a 10 degrees nose down pitch command
• FMA roll mode shows selected mode or blank if none selected
• TO/GA is displayed in FMA
• passing through 60 knots, the F/D commands 15 degree nose up pitch attitude
• passing through 84 knots, the A/T mode switches to THR HLD

Question 16

What speed does the flight director target on lift off?

Answer 16

V2 +20 ( approx 15 degrees nose up)

Question 17

Climb out process on FMA:

Answer 17

At 400 feet, VNAV guidance becomes active
At 800 feet, A/T mode changes from THR HLD to ARM
TOGA remains illuminated until LVL CHG or VNAV or A/P is engaged in CMD

Question 18

When further than three miles from the FMC Route, what is the engagement criteria?

Answer 18

Have an intercept heading 90 degrees or less.
Airplane must intercept the route before the active waypoint.