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Both of the brakes are ratchet type brakes. The clutch lets the
stabilizer manual trim wheel input override the stabilizer trim
actuator input.
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - AFT COMPONENTS
EFFECTIVITY
GUN ALL 27-41-00
Page 22
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-41-00-007
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - AFT COMPONENTS
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - AFT COMPONENTS
EFFECTIVITY
GUN ALL 27-41-00
Page 23
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-41-00-007
Purpose
The stabilizer trim limit switches limit the range of horizontal
stabilizer motion. There are different limits for manual,
autopilot, and for flaps up and flaps down. The takeoff
warning switches tell the pilot of incorrect stabilizer position
at takeoff.
Location
The stabilizer trim limit switches are on the left side of the
horizontal stabilizer jackscrew attach fitting.
Physical Description
The five switches mount on vertical brackets attached to
structure. They are cam operated microswitches. The cam
mounts to a support tube which connects to the stabilizer center
section jackscrew attach fitting.
Functional Description
GUN 101-115
The cam moves with the horizontal stabilizer and operates the
five switches. The switches have these functions:
* S145 - Nose down autopilot and flaps not up electric limit
switch, operates at 0.05 units
* S546 - Nose down takeoff warning switch, operates at 2.40
units
* S844 - Nose down flaps up electric limit switch, operates at
4.30 units
* S132 - Nose up takeoff warning switch, operates at 8.75 units
* S144 - Nose up autopilot limit switch, operates at 14.50 units.
GUN 001-099, 201-999
The cam moves with the horizontal stabilizer and operates the
five switches. The switches have these functions:
* S145 - Nose down autopilot and flaps not up electric limit
switch, operates at 0.05 units
* S546 - Nose down takeoff warning switch, operates at 1.80
units
* S844 - Nose down flaps up electric limit switch, operates at
3.95 units
* S132 - Nose up takeoff warning switch, operates at 8.75 units
* S144 - Nose up autopilot limit switch, operates at 14.50 units.
GUN ALL
NOTE: The stabilizer trim limit switches are adjustable.
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - STABILIZER TRIM LIMIT SWITCHES
EFFECTIVITY
GUN ALL 27-41-00
Page 24
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-41-00-010
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - STABILIZER TRIM LIMIT SWITCHES
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - STABILIZER TRIM LIMIT SWITCHES
EFFECTIVITY
GUN ALL 27-41-00
Page 25
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-41-00-010
General
The stabilizer trim actuator gets 115 volt, three-phase, 400 Hz
AC power. Power comes from transfer bus 2. The stabilizer trim
actuator has an internal AC to DC converter that changes input
power to 270v dc necessary for the brushless DC motor. Control
power is 28v dc from bus 2.
Normal Sequence
The pilots operate the switches on either control wheel. This
sends control power to energize the stab trim control relay R64.
Three-phase AC power goes to the motor.
The range of stabilizer trim is limited in both directions by the
stabilizer trim limit switches.
Trim Speed Change
GUN 001-017, 019-099, 101-113, 115, 201-999
The flaps up switch (S245) controls the rate of trim through the
stab trim interlock relay (R850). The stab trim interlock relay
prevents control signals from going to the stab trim actuator
unless the pilots operate the switches on either control wheel.
GUN ALL
When the flaps are up, the switch is open and low speed trim is
engaged. Low speed trim moves the stabilizer at 0.2 units per
second. When the flaps are not up, the switch closes and sends
a signal to the stabilizer trim actuator to engage high speed
trim. High speed trim moves the stabilizer at 0.4 units per
second.
During autopilot operation, the stabilizer trim speed changes.
When the flaps are up, the low speed trim is 0.09 units per
second. When the flaps are not up, the high speed trim is 0.27
　
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