(10)
 Move the captain's stabilizer-trim control-wheel-switches up (airplane nose down) and do the check that follows:

 (a)  
Measure the time necessary for the stabilizer to go to the airplane nose down electrical-trim-stop (stabilizer leading edge up). 1) Make sure that the time is less than 54 seconds.

 S 865-424
 CAUTION: HOLD THE AIR SUPPLY PRESSURE TO THE AIRPLANE TO AN ABSOLUTE
_______ LIMIT OF 4.75 PSI (426 KNOTS). PRESSURE IS TO BE CHANGED AT A RATE OF NOT MORE THAN 2 PSI/MIN. THIS WILL PREVENT DAMAGE TO EQUIPMENT AND INJURY TO PERSONS.
 (11) Pressurize the auxiliary pitot lines (lower left and lower right) to
 4.23 | 0.10 psi (405 | 5 knots) (Ref 34-11-00).
 NOTE: Use airspeed values only when the static pressure on the
____ airspeed indicator is open to ambient pressure.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-41-00
 ALL  ú ú 02 Page 580E ú Jan 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 865-425
 (12)
 Extend the trailing edge flaps to the 15-unit detent (Ref 27-51-00).

 S 865-426

 (13)
 Move the captain's stabilizer-trim control-wheel-switches up (airplane nose down) and hold until the stabilizer stops.

 S 225-427

 (14)
 Measure and write down dimension B of the stabilizer jackscrew.

 S 865-428

 (15)
 Move the captain's stabilizer-trim control-wheel-switches down (airplane nose up) and hold for 25 seconds.

 S 225-429

 (16)
 Measure and write down dimension B of the stabilizer jackscrew.

 S 225-430

 (17)
 Calculate the difference of the above two written measurements.

 (a)  
Make sure that the difference is between 3.84 and 5.00 inches (97.5-127.0 mm).

 S 865-430
 (18)
 Move the captain's stabilizer-trim control-wheel-switches down (airplane nose up) and hold until the stabilizer stops.

 S 225-431

 (19)
 Measure and write down dimension B of the stabilizer jackscrew.

 S 865-432

 (20)
 Move the captain's stabilizer-trim control-wheel-switches up (airplane nose down) and hold for 29 seconds.

 (21)
 Measure and write down dimension B of the stabilizer jackscrew.

 S 225-433
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-41-00
 ALL  ú ú 02 Page 580F ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 225-434
 (22)
 Calculate the difference in the above two measurements.

 (a)  
Make sure that the difference is between 9.41 and 11.99 inches (239.0-304.5 mm).

 S 865-435
 (23)
 Put the RIGHT STAB TRIM SHUTOFF switch on the P10 panel to NORM.

 S 865-436

 (24)
 Put the CENTER STAB TRIM SHUTOFF switch on the P10 panel to CUTOUT.

 S 865-437

 (25)
 Move the captain's stabilizer-trim control-wheel-switches up (airplane nose down) and hold until the stabilizer stops.

 S 865-B16

 (26)
 Measure and write down dimension B of the stabilizer jackscrew.

 S 865-438

 (27)
 Move the captain's stabilizer-trim control-wheel-switches down (airplane nose up) and hold for 25 seconds.

 S 225-439

 (28)
 Measure and write down dimension B of the stabilizer jackscrew.

 S 225-440

 (29)
 Calculate the difference in the above two measurements.

 (a)  
Make sure that the difference is between 3.84 and 5.00 inches (97.5-127.0 mm).

 S 865-441
 (30)
 Move the captain's stabilizer-trim control-wheel-switches down (airplane nose up) and hold until the stabilizer stops.

 (31)
 Measure and write down dimension B of the stabilizer jackscrew.

 S 865-443

 (32)
 Move the captain's stabilizer-trim control-wheel-switches up (airplane nose down) and hold for 29 seconds.
　
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