737 Flight Crew Operations Manual
Automatic Flight -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
4.20.2 D6-27370-866-EGP
Autopilot Engagement Criteria
Each A/P can be engaged by pushing a separate CMD or CWS engage switch. A/P
engagement in CMD or CWS is inhibited unless both of the following pilot–
controlled conditions are met:
• no force is being applied to the control wheel
• the STAB TRIM AUTOPILOT cutout switch is at NORMAL.
Only one A/P can be engaged at a given time unless the approach (APP) mode is
engaged. Approach mode allows both A/Ps to be engaged at the same time. Dual
A/P operation provides control through landing flare and touchdown or an
automatic go–around.
In single A/P operation, full automatic flare and touchdown capability and A/P
go–around capability are not available.
Autopilot Disengagement
The A/P automatically disengages when any of the following occurs:
• pushing either A/P disengage switch
YW273, YW274
• column or wheel force override
• pushing either Takeoff/Go-around (TO/GA) switch with a single A/P
engaged in CWS or CMD;
• below 2000 feet RA or,
• with flaps not up or,
• G/S engaged
• pushing either Takeoff/Go-around (TO/GA) switch with a single A/P
engaged in CWS or CMD above 2000 feet RA with flaps not up or G/S
engaged.
• pushing either TO/GA switch after touchdown with both A/Ps engaged
in CMD
• pushing an illuminated A/P ENGAGE switch
• pushing the A/P DISENGAGE bar down
• activating either pilot’s control wheel trim switch
• moving the STAB TRIM AUTOPILOT cutout switch to CUTOUT
YW273, YW274
• for a column and/or wheel force override of a single or dual channel
CMD engaged autopilot, in approach or non-approach phase of flight.
The AFDS will maintain the active pitch and roll modes with flight
director guidance.
• either left or right IRS system failure or FAULT light illuminated
September 15, 2016
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