Flight Control Panel (before Rudder System Enhancement Program (RSEP) modification)
FEEL DIFF PRESS
SPEED TRIM FAIL
MACH TRIM FAIL
AUTO SLAT FAIL
Refer to Chapter 13 – Hydraulics
Flight SPOILER Switches (guarded to ON)
Used for maintenance purposes only.
OFF – closes the respective flight spoilers shutoff valve.
YAW DAMPER Light
Illuminated (amber) – yaw damper is not engaged.
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December 5, 2003 9.10.1
Flight Controls -Controls and Indicators 737 Operations Manual
YAW DAMPER Switch
OFF – disengages yaw damper.
ON – engages yaw damper to rudder power control unit.
ALTERNATE FLAPS Master Switch (guarded to OFF)
OFF – normal operating position.
ARM – closes trailing edge 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.
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.
Copyright . The Boeing Company. See title page for details.
9.10.2 June 6, 2003
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.
Flight Control Panel (after RSEP modification)
LOW QUANTITY
LOW PRESSURE
STBY RUD ON
FEEL DIFF PRESS
SPEED TRIM FAIL
MACH TRIM FAIL
AUTO SLAT FAIL
Copyright . The Boeing Company. See title page for details.
December 5, 2003 9.10.3
Flight Controls -Controls and Indicators 737 Operations Manual
FLIGHT CONTROL Switches
STBY RUD - activates standby pump and opens standby rudder shutoff valve to
pressurize standby rudder power control unit.
OFF - closes flight control shutoff valve isolating ailerons, elevators, and rudder
from associated hydraulic system pressure.
ON (guarded position) - normal operating position.
Flight Control LOW PRESSURE Lights
Illuminated (amber) -
.
indicates low hydraulic system (A or B) pressure to ailerons, elevator and
rudder
.
deactivated when associated FLT CONTROL switch is positioned to
STBY RUD and standby rudder shutoff valve opens
.
the A system light indicates A system pressure is low when full RPR
pressure is commanded.
Note: The A system light will remain illuminated for approximately five seconds after A hydraulic system is activated.
Flight SPOILER Switches (guarded to ON)
Used for maintenance purposes only.
OFF - closes the respective flight spoilers shutoff valve.
YAW DAMPER Light
Illuminated (amber) - yaw damper is not engaged.
YAW DAMPER Switch
OFF – disengages yaw damper.
ON – engages yaw damper to rudder power control unit.
STANDBY HYD Lights
STANDBY HYDRAULIC LOW QUANITY Light Illuminated (amber) -
.
indicates low quantity in standby hydraulic reservoir
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