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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-070
DFCS - FUNCTIONAL DESCRIPTION - A/P STABILIZER TRIM FUNCTION
DFCS - FUNCTIONAL DESCRIPTION - A/P STABILIZER TRIM FUNCTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The stabilizer trim system consists of these components:
* FCC A and FCC B
* Column switching module
* A/P stab trim cutout switch assembly
* Stab up and down limit switches
* Stab trim electric actuator.
FCC A and FCC B
The FCC can supply these commands:
* A/P trim nose up
* A/P trim nose down
* Speed trim nose up
* Speed trim nose down.
If the autopilot is engaged, the FCC can supply an A/P trim
command. If the autopilot is not engaged, the FCC can supply a
speed trim command.
The FCC makes sure that the control column is not forward
before it supplies a nose up trim command. The FCC makes
sure that the control column is not aft before it supplies a nose
down trim command.
The FCC supplies a trim valid signal if it does not command a
nose up and nose down trim at the same time.
The FCC supplies either an A/P engaged signal or the speed
trim reference hold signal as a clutch signal to the stab trim
electric actuator. This signal is also used as a clutch valid
signal.
The FCC supplies a flaps up signal to the stab trim electric
actuator.
Column Switching Module
When the main electric trim is in operation, switches in the
column switching module open. This does not let the FCC clutch
signal go to the trim actuator. The FCC and the main electric
trim cannot control the trim actuator at the same time.
If the pilot moves the control column forward or aft, signals go to
the two FCCs. These signals do not allow the FCC to supply trim
commands that do not agree with the pilot.
A/P Stab Trim Cutout Switch Assembly
When the A/P stab trim cutout switches are in the cutout
position, the FCC cannot control the stabilizer trim electric
actuator. The 28V DC engage interlock power from the IFSAU is
used to energize the cutout relay when the switch is in the
cutout position. The switches open and do not let the trim
commands and clutch signal go to the actuator. When the relay
energizes, the 28V DC engage interlock power does not go to
the FCC. This auto stab trim cutout signal tells the FCC that the
switch is in the cutout position.
DFCS - FUNCTIONAL DESCRIPTION - SPEED AND STABILIZER TRIM COMMANDS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-071
Stab Limit Up and Down Switches
The nose up and nose down trim commands go through the
stab limit switches. If the stabilizer is out of limit, these switches
will not let the commands go to the actuator.
Stabilizer Trim Electric Actuator
The trim actuator gets the trim commands from the FCC and
moves the stabilizer. It sends a signal to the FCCs to tell them
what speed the actuator is in. If the flaps are down, the actuator
operates three times as fast as when the flaps are up.
DFCS - FUNCTIONAL DESCRIPTION - SPEED AND STABILIZER TRIM COMMANDS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-071
DFCS - FUNCTIONAL DESCRIPTION - SPEED AND STABILIZER TRIM COMMANDS
DFCS - FUNCTIONAL DESCRIPTION - SPEED AND STABILIZER TRIM COMMANDS
EFFECTIVITY
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22-11-00-071
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22-11-00
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