27-41-00
ALL ú ú 02 Page 573 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 865-878
(82)
At the same time, pull the captain's control column 3 to 4 inches (76-101 mm) aft and hold in position.
S 865-879
(83)
Move the captain's stabilizer-trim control-wheel-switches down (airplane nose up).
(a)
Make sure the stabilizer moves.
S 865-880
(84)
Move the captain's stabilizer-trim control-wheel-switches up (airplane nose down).
(a)
Make sure the stabilizer moves.
S 865-881
(85)
Release the stabilizer-trim control-wheel-switches.
S 865-882
(86)
Let the control columns go to the neutral position.
K.
AIRPLANES WITH STAB TRIM LEVERS ON THE CONTROL STAND; Manual Operation and Mechanical Travel Limits Test (Fig. 501)
S 865-341
(1)
Put the RIGHT and CENTER STAB TRIM SHUTOFF switches on the P10 panel to NORM.
S 865-342
(2)
Move both of the STAB TRIM control levers forward full travel.
(a)
Make sure that the stabilizer moves in the airplane nose down direction (stabilizer leading edge up).
S 865-343
(3)
Release both STAB TRIM control levers.
(a)
Make sure that stabilizer movement stops.
S 865-344
(4)
Move the STAB TRIM control levers forward full travel and hold until the travel limit mechanism cancels the lever input. ( A sudden increase in the force required to hold left lever forward is felt when the lever input is cancelled.)
S 865-345
(5)
Put the RIGHT and CENTER STAB TRIM SHUTOFF switches on the P10 panel to CUTOUT.
(a)
Make sure that the stabilizer-trim ballscrew-actuator upper-stop surfaces have not hit each other.
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27-41-00
ALL ú ú 02 Page 574 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(b) Make sure that the stops on the upper end of the ballnut are
between 60 to 210 degrees from the stop lugs on the upper end
of the ballscrew (0.10 to 0.36 inch (2.5-9.1 mm) axial
dimension along the ballscrew).
NOTE:____ One full turn of the ballscrew is equivalent to
inch of ax (15.87 mm) axial movement along the
ballscrew.
(c) Make sure that both stabilizer-trim position indicators read
0 | 1/4 unit of trim.
S 865-349
(6)
Put the RIGHT and CENTER STAB TRIM SHUTOFF switches on the P10 panel to NORM.
S 865-350
(7)
Move both of the STAB TRIM control levers aft full travel.
(a)
Make sure that the stabilizer moves in the airplane nose up direction (stabilizer leading edge down).
S 865-351
(8)
Release the STAB TRIM control levers.
(a)
Make sure that stabilizer movement stops.
S 865-352
(9)
Move the STAB TRIM control levers aft full travel and hold until the travel limit mechanism cancels the lever input. ( A sudden increase in the force required to hold the left lever aft occurs when the lever input is cancelled.)
S 865-353
(10)
Put the RIGHT and CENTER STAB TRIM SHUTOFF switches on the P10 panel to CUTOUT.
(a)
Make sure that the lower stop surfaces on the ballscrew have not hit each other.
(b)
Make sure that the stop lugs on the lower end of the ballnut are between 60 to 210 degrees from the stop lugs on the upper flange of the gearbox (0.10 to 0.36 inch (2.5-9.1 mm) axial dimension along the ballscrew).
NOTE: One full turn of the ballscrew is equivalent to 0.625
____ inch of ax (15.87 mm) axial movement along the ballscrew.
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