737 Flight Crew Operations Manual
Automatic Flight -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 4.10.19
1 Autopilot (A/P) Disengage Light
Illuminated (red) –
• flashes and tone sounds when autopilot has disengaged.
YW273, YW274
• flashes and tone sounds when an autopilot engage attempt is made and
is unsuccessful.
• reset by pushing either disengage light or either A/P disengage switch.
• steady for any of following conditions:
• stabilizer out of trim below 800 feet RA on dual channel approach
• ALT ACQ mode inhibited during A/P go–around if stabilizer not
trimmed for single A/P operation
• disengage light test switch held in position 2
• automatic ground system tests fail.
Illuminated (amber) –
• steady – disengage light test switch held in position 1.
• flashing – A/P automatically reverts to CWS pitch or roll while in
CMD. Resets by pushing either light or selecting another mode.
2 Autothrottle (A/T) Disengage Light
Illuminated (red) –
• flashing – autothrottle has disengaged
• steady – disengage light test switch held in position 2.
Illuminated (amber) –
• steady – disengage light test switch held in position 1
• flashing – indicates A/T airspeed error under following conditions:
• inflight
• flaps not up
• airspeed differs from commanded value by +10 or -5 knots and is not
approaching commanded value.
3 Disengage Light Test (TEST) Switch
TEST 1 – illuminates autopilot/autothrottle disengage and FMC alert lights steady
amber.
TEST 2 – illuminates autopilot/autothrottle disengage lights steady red and FMC
alert light steady amber.
Spring–loaded to center position.
September 15, 2016
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