757
MAINTENANCE MANUAL

STABILIZER BALLSCREW ACTUATOR
A

1  THE GAGE ASSEMBLY CAN BE USED TO ACCURATELY SET THE STABILIZER DIMENSION B TO 19.07 |0.01 INCHES.
TO USE, PUT THE GAGE ASSEMBLY AGAINST THE
BALLSCREW SUCH THAT THE LOWER BOLTHEAD IS
ON THE SHOULDER OF THE LOWER STOP. MAKE
SURE THAT THE FEELER BLADE CANNOT BE PUT
BETWEEN THE GAGE ASSEMBLY UPPER BOLTHEAD
AND THE SHOULDER OF THE UPPER STOP. MAKE
SURE THE SHOULDER OF THE UPPER STOP DOES
NOT TOUCH THE UPPER BOLTHEAD.

Measurement of Stabilizer Dimension B Figure 402
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A

757 MAINTENANCE MANUAL
 (3)  S 864-005AIRPLANES WITH STAB TRIM LEVERS ON THE CONTROL STAND; use the STAB TRIM levers to move the stabilizer until you can install rig pins E/ST1 and E/ST2 (Fig. 401).
 NOTE:____ If rig pins E/ST1 and E/ST2 cannot be installed at the same time, move the stabilizer until Dimension B on the stabilizer ballscrew actuator is 19.07 | 0.01 inches (484.4 +/- 0.25 mm).
 (4)  S 864-006AIRPLANES WITH ALTERNATE STAB TRIM SWITCHES ON THE CONTROL STAND; use the alternate stab trim switches to move the stabilizer until Dimension B on the stabilizer ballscrew actuator is 19.07 | 0.01 inches (Fig. 402).
 (5)  S 864-007Remove the pressure from the right hydraulic system (AMM 29-11-00/201).
 (6)  S 214-008Make sure the pressure is removed from the center hydraulic system (AMM 29-11-00/201).
 (7)  S 864-009Put the RIGHT and CENTER STAB TRIM SHUTOFF valve switches on the control stand panel, P10, to the CUTOUT position.
 (8)  S 864-010Open these circuit breakers on the overhead panel, P11, and attach DO-NOT-CLOSE tags: (a) 11B19, STAB TRIM ALT (IF INSTALLED) (b) 11C12, STAB TRIM SHUTOFF LEFT (c) 11C13, STAB TRIM SHUTOFF RIGHT (d) 11H11 or 11C05, STAB TRIM CONT L (e) 11H20, STAB TRIM CONT R
 (9)  S 494-012AIRPLANES WITH STAB TRIM TRIM LEVERS ON THE CONTROL STAND; attach DO-NOT-OPERATE tags to the STAB TRIM levers and the control wheel switches.

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 ALL  ú ú 02 Page 405 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 494-013
 (10) AIRPLANES WITH ALTERNATE STAB TRIM SWITCHES ON THE CONTROL STAND; attach DO-NOT-OPERATE tags to the alternate stab trim switches and the control wheel switches.
 S 014-014
 WARNING: STAY OFF THE SERVICE ACCESS DOOR, 311AL AND THE ELEVATOR
_______ CONTROL ACCESS DOOR, 313AL. YOUR WEIGHT CAN RELEASE THE SPRING-LOADED LATCHES ON THE DOOR. IF YOU FALL THROUGH THE DOOR, INJURIES CAN OCCUR.
 (11)
 Open the access door for the forward stabilizer compartment, 311AL (Ref 06-42-00).

 E.
Remove the Brake Pressure Switch (Fig. 401)

 S 494-016
 (1)  AIRPLANES WITH STAB TRIM LEVERS ON THE CONTROL STAND; install rig pins E/ST1 and E/ST2.
 NOTE: If rig pins E/ST1 and E/ST2 cannot be installed at the same
____ time, make sure Dimension B on the stabilizer ballscrew actuator is 19.07 | 0.01 inches
 (484.4 +/- 0.25 mm).
 S 034-017
 (2)  
Disconnect the electrical connector from the brake pressure switch.

 S 024-018

 (3)  
Remove the brake pressure switch from the STCM.

 S 034-019

 (4)  
Discard the o-ring and the two backup rings.

 S 034-020

 (5)  
Put a cap on the open port on the STCM.

 TASK 27-41-07-424-021
 3. Install the Brake Pressure Switch
_________________________________
 A. References
 (1)  
06-42-00/201, Empennage Access Doors and Panels

 (2)  
24-22-00/201, Electrical Power - Control

 (3)  
27-09-00/201, Flight Control System Electronics Unit (CSEU) -Maintenance Practices

 (4)  
29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems

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