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

Master (MA) Flight Director Indicators (white letters)
If a F/D switch is ON, the light indicates which FCC is controlling the F/D modes.
.
illuminated – related FCC is controlling F/D modes.

.
extinguished – F/D modes are controlled from opposite FCC

.
both lights illuminated – each FCC is controlling modes for related F/D.

Flight Director (F/D) Switch
YC153, YC154
Left F/D switch activates command bars on the Captain’s attitude indicator. Right
F/D switch activates command bars on the First Officer’s attitude indicator.

YA613 - YA809, YC411 - YK104
Left F/D switch activates the command bar on the Captain’s attitude indicator.
Right F/D switch activates the command bar on the First Officer’s attitude
indicator.

ON –

.  
in flight with A/P ON and F/Ds OFF, turning a F/D switch ON engages
F/D in currently selected A/P modes

.
displays FD in A/P status display if A/P is OFF or engaged in CWS

.  
enables command bar display on related pilot’s attitude indicator
YC153, YC154

.
command bars are displayed if command pitch and/or roll modes are

engaged
YA613 - YA809, YC411 - YK104

.  
command bars are displayed if command pitch and roll modes are
engaged
YA686, YA687
. on ground, arms pitch and roll modes for engagement in TO/GA and
wings level when TOGA switch is pushed.
YA613, YA626, YA721 - YK104

.  on ground, arms pitch and roll modes for engagement in TO/GA and
HDG SEL when TOGA switch is pushed.

YC153, YC154
OFF – command bars retract from related pilot’s attitude indicator.

YA613 - YA809, YC411 - YK104
OFF – command bar retracts from related pilot’s attitude indicator.

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

Automatic Flight -Controls and Indicators
Autopilot / Autothrottle Controls

Autopilot Disengage Switch
Push –
.
disengages both autopilots

.
A/P disengage lights flash

.
A/P disengage warning tone sounds for a minimum of two seconds

.  
second push extinguishes disengage lights and silences disengage
warning tone

.  
if autopilot automatically disengages, extinguishes A/P Disengage lights
and silences A/P warning tone.

Autothrottle Disengage Switches
Push –
.
disengages autothrottle

.
A/T disengage lights flash

.
A/T ARM switch trips OFF

.
second press extinguishes A/T disengage lights

.
extinguishes A/T disengage lights after automatic A/T disengagement.

Takeoff/Go–Around (TO/GA) Switches
Push – engages AFDS and A/T in takeoff or go–around mode if previously armed.
Copyright . The Boeing Company. See title page for details.
Automatic Flight -Controls and Indicators

Autopilot / Autothrottle Indicators

Autopilot (A/P) Disengage Light
Illuminated (red) –
.
flashes and tone sounds when autopilot has disengaged

.
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.
YA686, YA687, YC411 - YD655

.  
flashing – A/P automatically reverts to CWS pitch or roll while in CMD. Resets by pushing either light or selecting another mode.

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

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

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

Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual
Illuminated (amber) –
.  
steady – disengage light test switch held in position 1
　
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