737 Flight Crew Operations Manual
Flight Controls -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 9.10.3
7 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.
8 ALTERNATE FLAPS Position Switch
Functions only when the ALTERNATE FLAPS master switch is in ARM.
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.
9 Feel Differential Pressure (FEEL DIFF PRESS) Light
Armed when the TE flaps are up or down.
Illuminated (amber) -
• indicates excessive differential pressure in the elevator feel computer.
Note: Excessive differential pressure can be caused by erroneous activation of
the Elevator Feel Shift module.
10 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.
11 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.
September 24, 2015
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