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.
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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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