.
always armed. STANDBY HYDRAULIC LOW PRESSURE Light

Copyright . The Boeing Company. See title page for details.
9.10.4   December 5, 2003

Flight Controls -Controls and Indicators 737 Operations Manual
Illuminated (amber) -
.
indicates output pressure of standby pump is low

.  
armed only when standby pump operation has been selected or automatic
standby function is activated.

STBY RUD ON Light Illuminated (amber) - indicates the standby hydraulic system is commanded on to pressurize the standby rudder power control unit.

ALTERNATE FLAPS Master Switch
OFF - (guarded position) - normal operating position.
ARM - closes trailing edge flap bypass valve, activates standby pump, and arms
ALTERNATE FLAPS position switch.

ALTERNATE FLAPS Position Switch
Functions only when the ALTERNATE FLAPS master switch is in ARM. UP –
.
electrically retracts trailing edge flaps

.  
leading edge devices remain extended and cannot be retracted by the
alternate flaps system.

OFF – normal operating position. DOWN (spring loaded to OFF) –
.  
(momentary) fully extends leading edge devices using standby hydraulic
pressure

.
(hold) electrically extends trailing edge flaps.

Feel Differential Pressure (FEEL DIFF PRESS) Light
Armed when the trailing edge flaps are up.
Illuminated (amber) – indicates excessive differential pressure in the elevator feel
computer.

SPEED TRIM Failure (FAIL) Light
Illuminated (amber) –
.
indicates failure of the speed trim system

.  
indicates failure of a single FCC channel when MASTER CAUTION
light recall is activated and light extinguishes when master caution system
is reset.

Flight Controls -Controls and Indicators 737 Operations Manual

MACH TRIM Failure (FAIL) Light
Illuminated (amber) –
.
indicates failure of the mach trim system

.  
indicates failure of a single FCC channel when MASTER CAUTION light recall is activated and light extinguishes when master caution system is reset.

Automatic (AUTO) SLAT Failure (FAIL) Light
Illuminated (amber) –
.
indicates failure of both auto slat computers.

.  
indicates failure of a single autoslat computer when illuminated during
MASTER CAUTION recall and extinguishes when master caution
system is reset.

Copyright . The Boeing Company. See title page for details.
9.10.6   December 5, 2003
Flight Controls -Controls and Indicators
737 Operations Manual
Stabilizer
STAB TRIM
APL NOSE DOWN
1
0
5 10 15
APL
TAKE-OFF
2
3
NOSE UP
CONTROL STAND
1 2
STAB TRIM
MAIN AUTO
4
OVERRIDE
ELECT PILOT
NORMAL
5 6
7
CUT
OUT

NORM
CONTROL WHEEL CONTROL STAND AFT ELECTRONIC PANEL
8
1
STAB TRIM
2
STAB TRIM
MAIN AUTO ELEC
NORMALPILOT OVRD
STAB
OUT OF
TRIM

NORM OUT
CUT
CENTER
INSTRUMENT
PANEL

# As installed
Stabilizer Trim Wheel
.
provides for manual operation of stabilizer . overrides any other stabilizer trim inputs

.
rotates when stabilizer is in motion.

Note: handle should be folded inside stabilizer trim wheel for normal operation
Flight Controls -Controls and Indicators 737 Operations Manual

Stabilizer Trim Indicator
Indicates units of airplane trim on the adjacent scale.

Stabilizer Trim Green Band Range
Corresponds to allowable range of trim settings for takeoff

Stabilizer Trim Switches (spring–loaded to neutral)
Push (both) –
.
electrically commands stabilizer trim in desired direction

.
autopilot disengages if engaged.

Stabilizer Trim Main Electric (MAIN ELECT) Cutout Switch
NORMAL – normal operating position.
CUTOUT – deactivates stabilizer trim switch operation.

Stabilizer Trim AUTOPILOT Cutout Switch
NORMAL – normal operating position. CUTOUT –
.
deactivates autopilot stabilizer trim operation

.
autopilot disengages if engaged.

Stabilizer Trim Override Switch
OVERRIDE – bypasses the control column actuated stabilizer trim cutout switches to restore power to the stabilizer trim switches NORM – normal operating position.
　
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