B.  
AIRPLANES WITH STAB TRIM LEVERS ON THE CONTROL STAND;
 STAB TRIM Control Levers (Fig. 3)

 (1)  
The control stand is equipped with two levers which control the stabilizer in the manual mechanical mode. The levers are connected to the STCM's by cables. One lever activates the arm hydraulic valve in both STCM's and the other lever activates the control hydraulic valve. Movement of the STAB TRIM control levers overrides all electric trim commands.

 (2)  
The arm lever is equipped with a stab trim standby switch which transmits an electrical signal to the SAM when the STAB TRIM control levers are engaged. This synchronizes the mach/speed trim function to the stabilizer position commanded by the manual control system. It also prevents mistaken annunciation of unscheduled stabilizer movement.

 C.  
AIRPLANES WITH ALTERNATE STAB TRIM SWITCHES ON THE CONTROL STAND; Alternate Stab Trim Switches (Fig. 3)

 (1)  
Dual switches, on the control stand panel, operate the stabilizer trim system in the alternate-electric control mode. The switches are mounted side-by-side on the control stand such that both can be operated at the same time. The left segment operates the "control" hydraulic valves on the STCMs and the right segment operates the "arm" hydraulic valve on the STCMs. Movement of the alternate stab trim switches in the opposite direction of the control wheel switches stops the movement of the horizontal stabilizer.

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A

757
MAINTENANCE MANUAL

CONTROL WHEEL
SEE A
FLIGHT COMPARTMENT
STABILIZER TRIM SWITCHES
STABILIZER TRIM
CONTROL WHEEL SWITCHES
SEE B
PUSH-TO-TALK SWITCH
CONTROL WHEEL
AUTOPILOT SWITCH
FWDCONNECTOR INSULATOR (EXAMPLE)
MEDALLION
SCREW
STABILIZER TRIM CONTROL WHEEL
CONTROL WHEEL SWITCHES
A B
Stabilizer Trim Control Wheel Switches
Figure 2

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

C SLA
SLB SHEAROUTC SP1B,SP2B
L
SP1BSP2A C SP1A,SP2A,SLA CABLE
L
LTERMINATION STABILIZER(NEUTRALRIGGED SLA
POSITION)SP1A
SEE BSP2A
F
RIGGING PINLOCATIONS
SLA
E
SLB
SLB SLA
STANDBY TRIM SYSTEM
STABILIZER TRIM
SEE A
POSITIONSTAB TRIMSTAB TRIM
INDICATOR (EXAMPLE)
APL

"CONTROL" "ARM" LEVER
NOSE

SEE C "ARM"
LEVER
DN 0
CABLES CABLE
SLA SLB
2 S
TERMINATION
STABILIZER TRIM
4
T
SHUTOFF SEE F
A 6
STABILIZER TRIM
SWITCHES
B
ST2A
8
STANDBY SP1B SP1A
T
R

ST2B
10
SWITCH HORIZONTAL
I12
SEE D
MO
STABILIZER
ST1A
14
F
APL
NOSE

F
ST1B
UP
SP2A SLASP2B
C
STABILIZER TRIM
STANDBY SWITCH

SECONDARYLIMIT SWBRAKE AND POSITION(EXAMPLE)
TRANSMITTER"CONTROL" MODULE (EXAMPLE)
STABILIZER TRIMCAM CONTROL MODULEARM LEVER CABLES
DRIVE SEE E(EXAMPLE) HYDRAULICMOTOR (EXAMPLE)
A B D
Horizontal Stabilizer Trim System Schematic
Figure 3 (Sheet 1)

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 CONTROL STAND  ú ú 02 Page 7 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

SP1BSHEAROUT
C SP1B,SP2B,
L
SP2B C SP1A,SP2A,
SP3BSP3B
L
CABLE
　
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