.
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.

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.

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.
Thrust Mode Display

Copyright . The Boeing Company. See title page for details.
March 28, 2005   4.10.23
Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual

Thrust Mode Display
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.

YD651 - YD655
Thrust mode display annunciations are:

.
TO – takeoff

.
TO 1 – derated takeoff one

.
TO 2 – derated takeoff two

.
D-TO – assumed temperature reduced thrust takeoff

.
D-TO 1 – derate one and assumed temperature reduced thrust takeoff

.
D-TO 2 – derate two and assumed temperature reduced thrust takeoff

.
CLB – climb

.
CLB 1 – derated climb one

.
CLB 2 – derated climb two

.
CRZ – cruise

.
G/A – go–around

.
CON – continuous
. ––– – FMC not computing thrust limit.

YA613 - YC413, YK101 - YK104 Thrust mode display annunciations are:
.
TO – takeoff

.
R-TO – reduced takeoff

.
R-CLB – reduced climb

.
CLB – climb

.
CRZ – cruise

.
G/A – go–around

.
CON – continuous
. ––– – FMC not computing thrust limit.

YA613 - YC413, YK101 - YK104
Note:  R-TO does not indicate the type of reduced takeoff. The N1 limit may be reduced due to the entry of an assumed temperature, a takeoff thrust derate or a combination of both assumed temperature and takeoff thrust derate.

Autothrottle Limit (A/T LIM) Indication
Illuminated (white) – the FMC is not providing the A/T system with N1 limit values. The A/T is using a degraded N1 thrust limit from the related EEC.
Copyright . The Boeing Company. See title page for details.
4.10.24   June 1, 2005

Automatic Flight -Controls and Indicators
Flight Mode Annunciations (FMAs)
YD651 - YK104

Autothrottle (A/T) Engaged Mode
.
N1 (green)

.
GA (green)

.
Retard (green)

.
FMC SPD (green)

Roll Engaged Mode
.
HDG SEL (green)

.
VOR/LOC (green)

Roll Armed Mode
YK101 - YK104
. VOR/LOC (white)

Pitch Engaged Mode
.
TO/GA (green)

.
V/S (green)

.
MCP SPD (green)

.
ALT/ACQ (green)

.
ALT HOLD (green)

.
MCP SPD (green)

.
THR HLD (green)

.
ARM (white)

.
LNAV (green)

YD651 - YD655

.
LNAV VOR/LOC (white)

.
G/S (green)

.
FLARE (green)

.
VNAV SPD (green)

.
VNAV PTH (green)

Copyright . The Boeing Company. See title page for details.
Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual

Mode Highlight Change Symbol
A mode change highlight symbol (rectangle) is drawn around each pitch, roll, CWS, A/P status, and thrust engaged mode annunciation for a period of 10 seconds after each engagement.

CWS Roll Engaged
.CWS R (amber)

Autopilot Status
.
CMD (green) . FD (green)

.
SINGLE CH (amber)

CWS Pitch Engaged
.CWS P (amber)

Pitch Armed Mode
.
G/S (white) .FLARE (white)

.
V/S (white) . G/S V/S (white)

YA613 - YC413

Copyright . The Boeing Company. See title page for details.
4.10.26  June 1, 2005
　
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