YAW DAMPER Switch OFF – disengages yaw damper. ON –
.
engages main yaw damper to main rudder power control unit if the B FLT CONTROL switch is in the ON position
.
engages standby yaw damper to standby rudder power control unit if both the A and B FLT CONTROL switches are in the STBY RUD position.
STANDBY HYD Lights STANDBY HYDRAULIC LOW QUANTITY Light Illuminated (amber) -
.
indicates low quantity in standby hydraulic reservoir
.
always armed. STANDBY HYDRAULIC LOW PRESSURE Light 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.
YD651 - YK104 STBY RUD ON Light
. Illuminated (amber) - indicates the standby rudder system is commanded on to pressurize the standby rudder power control unit.
ALTERNATE FLAPS Master Switch
OFF (guarded position) – normal operating position.
ARM – closes TE flap bypass valve, activates standby pump, and arms the ALTERNATE FLAPS position switch.
ALTERNATE FLAPS Position Switch
Functions only when the ALTERNATE FLAPS master switch is in ARM.
Copyright . The Boeing Company. See title page for details.
Flight Controls -Controls and Indicators 737 Flight Crew Operations Manual
UP –
.
electrically retracts TE flaps
.
LE devices remain extended and cannot be retracted by the alternate flaps
system.
OFF – normal operating position.
DOWN (spring loaded to OFF) –
.
(momentary) fully extends LE devices using standby hydraulic pressure
.
(hold) electrically extends TE flaps until released.
Feel Differential Pressure (FEEL DIFF PRESS) Light
YA721, YA722
Armed when the TE flaps are up.
YA613 - YA687, YA801 - YK104
Armed when the TE flaps are up or down.
Illuminated (amber) -
. indicates excessive differential pressure in the elevator feel computer.
YA613 - YA687, YA801 - YK104
Note: Excessive differential pressure can be caused by erroneous activation of the Elevator Feel Shift module.
Speed Trim Failure (SPEED TRIM 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.
Mach Trim Failure (MACH TRIM 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.
Copyright . The Boeing Company. See title page for details.
9.10.4 September 26, 2003
Flight Controls -Controls and Indicators 737 Flight Crew Operations Manual
Automatic Slat Failure (AUTO SLAT FAIL) Light
Illuminated (amber) –
.
indicates failure of the auto slat system
.
indicates failure of a single Stall Management/Yaw Damper (SMYD) computer when illuminated during MASTER CAUTION recall and extinguishes when master caution system is reset.
Copyright . The Boeing Company. See title page for details.
Flight Controls -Controls and Indicators
737 Flight Crew Operations Manual
Stabilizer
STAB TRIM
APL NOSE DOWN
1 2
0
5
TAKE-OFF
3
10
15
APL
NOSE UP
CONTROL STAND
STAB TRIM
4 MAIN AUTO
ELECT PILOT
NORMAL OVERRIDE
5 6
7
CUT OUT NORM
CONTROL WHEEL CONTROL STAND AFT
ELECTRONIC
PANEL
CENTER
STAB
8
OUT OF
FORWARD
TRIM
PANEL
1 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
2 Stabilizer Trim Indicator
Indicates units of airplane trim on the adjacent scale.
3 Stabilizer Trim Green Band Range
Corresponds to allowable range of trim settings for takeoff.
Copyright . The Boeing Company. See title page for details.
9.10.6 September 26, 2003
Flight Controls -Controls and Indicators 737 Flight Crew Operations Manual
Stabilizer Trim Switches (spring-loaded to neutral)
Push (both) –
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