S 865-378

 (22)
 Put the RIGHT STAB TRIM SHUTOFF switch on the P10 panel to NORM.

 S 865-379

 (23)
 Move only the left STAB TRIM control lever forward.

 (a)
Make sure that the stabilizer does not move.

 S 865-380
 (24)
 Move only the right STAB TRIM control lever forward.

 (a)
Make sure that the stabilizer does not move.

 S 865-381
 (25)
 Move only the left STAB TRIM control lever aft.

 (a)
Make sure that the stabilizer does not move.

 S 865-382
 (26)
 Move only the right STAB TRIM control lever aft.

 (a)
Make sure that the stabilizer does not move.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

757 MAINTENANCE MANUAL
 S 865-383
 (27)
 Move the STAB TRIM control levers full travel in opposite directions from each other. Move the levers at approximately the same rate.

 (a)  
Make sure that the stabilizer does not move.

 S 865-384
 (28)
 Move the STAB TRIM control levers to the opposite positions.  Both levers must pass through the neutral position at the same time.

 (a)  
Make sure that the stabilizer does not move.

 S 865-385
 (29)
 Let both of the STAB TRIM control levers go to the neutral position at approximately the same rate.

 (a)  
Make sure that the stabilizer does not move.

 S 085-386
 (30)
 Remove the masking tape from the control stand.

 M.  
AIRPLANES WITH STAB TRIM LEVERS ON THE CONTROL STAND; Manual Override Lever Force Test (Fig. 501)

 S 865-387
 (1)  
Put the RIGHT and CENTER STAB TRIM SHUTOFF switches on the P10 panel to CUTOUT.

 S 865-388

 (2)  
Move the STAB TRIM control levers forward full travel and aft full travel.

 (a)  
Make sure that the levers move smoothly and freely.

 S 865-389
 (3)  
Move only the left STAB TRIM control lever forward.

 S 225-390

 (4)  
Measure the maximum break-out force found.

 (a)  
Make sure that the break-out force does not exceed 8.25 lbs

 (36.7 newtons).
 NOTE: "Break-out" is when the lever on the hydraulic
____ control module starts to move; not when the STAB TRIM levers move or when the stabilizer starts to move.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-41-00
 ALL  ú ú 02 Page 579 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 865-391
 (5)  
Move only the right STAB TRIM control lever forward.

 S 225-392

 (6)  
Measure the maximum break-out force found.

 (a)  
Make sure that the break-out force is not more than 8.25 lbs

 (36.7 newtons).
 NOTE: "Break-out" is when the lever on the hydraulic
____ control module starts to move; not when the STAB TRIM levers move or when the stabilizer starts to move.
 S 865-393
 (7)  
Move only the left STAB TRIM control lever aft.

 S 225-394

 (8)  
Measure the maximum break-out force found.

 (a)  
Make sure that the break-out force is not more than 8.25 lbs

 (36.7 newtons).
 S 865-395
 (9)  
Move only the right STAB TRIM control lever aft.

 S 225-396

 (10)
 Measure the maximum break-out force found.

 (a)  
Make sure that the break-out force is not more than 8.25 lbs

 (36.7
 newtons).

 N.  
AIRPLANES WITH STAB TRIM LEVERS ON THE CONTROL STAND; Manual Override Operation Test