.
reset by pushing either disengage light or either A/P disengage switch

.
steady –

.
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.

Automatic Flight -Controls and Indicators 737 Operations Manual

Illuminated (amber) –
.  flashing (on some airplanes) – autopilot has automatically reverted to
CWS pitch or roll while in CMD

. resets when either light is pressed or another mode engaged
steady – disengage light test switch held in position 1.

Autothrottle (A/T) Disengage Light
Illuminated (red) –
.
flashing – autothrottle has disengaged

.
steady – disengage light test switch held in position 2.

Illuminated (amber) –
.  
flashing (on some airplanes) – indicates autothrottle speed error if speed
not held within +10 or -5 knots of commanded speed when all of the
following conditions exist:

.
in flight

.
flaps not up

.
A/T engaged in MCP SPD or FMC SPD mode

.  
automatic test of flashing function is performed if the A/T is engaged
under the above conditions when more than 150 seconds have passed
since liftoff

. amber light flashes for 2 seconds, remains extinguished for 2 seconds,
then flashes again for 2 seconds
steady – disengage light test switch held in position 1.

Disengage Light 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.

Stabilizer Out Of Trim (STAB OUT OF TRIM) Light
Operates only with autopilot engaged. Remains extinguished with autopilot not engaged.
Illuminated (amber) – autopilot not trimming stabilizer properly.
Copyright . The Boeing Company. See title page for details.
4.10.18   December 1, 2000

Automatic Flight -Controls and Indicators
Altitude Alert

ALTITUDE ALERT Light
Illuminated (amber) – airplane is approaching or departing selected altitude.

Speaker
Transmits alert tone when airplane approaches or departs selected altitude.

Barometric Reference Selector
Selects captain’s or first officer’s altimeter as barometric correction source for altitude alert and for autopilot altitude acquisition
Automatic Flight -Controls and Indicators

Thrust Mode Display / Thrust Mode Annunciator Panel

Autothrottle Limit (A/T LIM) Light
Illuminated (white) – Indicates A/T computer is calculating a degraded N1 limit for the affected engine or engines.

Thrust Mode Display/Thrust Mode Annunciator Panel
N1 limit reference is the active N1 limit for autothrottle and manual thrust control.
N1 limit reference is also displayed by N1 reference bugs with N1 SET control in
AUTO position.
N1 limit reference is normally calculated by the FMC.
Thrust mode display/Thrust mode annunciator panel annunciations are:

.
R – Reduced. Can appear with TO or CLB

.
TO –Takeoff

.
CLB – Climb

.
CRZ – Cruise

.
G/A – Go–around

.
CON – Continuous

Copyright . The Boeing Company. See title page for details.
4.10.20  December 1, 2000

Automatic Flight -Controls and Indicators 737 Operations Manual
.  – – – – FMC not computing thrust limit.
.  A/T LIM (Thrust mode annunciator panel) – Autothrottle limit. Indicates A/T computer is calculating a degraded N1 limit for the affected engine or engines.
Flight Mode Annunciations (FMAs)
A/T ENGAGED MODE
N1   (G)
GA   (G)
RETARD  (G)
FMC SPD (G)
MCP SPD (G)
THR HLD (G)
ARM  (W)

PITCH ARMED MODE
  G/S  (W)  V/S  (W)  G/S V/S (W)   FLARE   (W)

MODE CHANGE HIGHLIGHT SYMBOL
A mode change highlight symbol (rectangle) is drawn around eachpitch, roll, CWS, and thrust engaged mode annunciation for a period of 10 seconds after each engagement.
PITCH ENGAGED MODE
 TO/GA (G)  V/S   (G) ALT ACQ  (G) ALT HOLD (G)VNAV SPD (G)VNAV PTH (G)  MCP SPD  (G)  G/S   (G) FLARE (G)
　
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