27-41-02
ALL ú ú 03 Page 610 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(d)
Remove the check tool from the left stabilizer hinge.
1) Open the release valve on the hydraulic pump assembly to release hydraulic pressure.
(e)
Install the left upper truss between the hinge support fitting and the structure. 1) Tighten the nuts to 10-15 pound-inches (1.13-1.70
newton-meters) and re-install the cotter pins.
S 226-016
(2) Measure the free play at the right stabilizer hinge (with check tool):
WARNING: DO NOT START THE ENGINE, JACK, MOVE OR FUEL THE AIRPLANE
_______ WHEN THE TRUSSES ARE REMOVED. THIS CAN CAUSE INJURY TO PERSONNEL OR DAMAGE TO EQUIPMENT.
(a)
Remove the right upper truss between the hinge support fitting and the airplane structure.
(b)
Install the check tool and the dial indicator at the right stabilizer hinge. 1) Install the jack assembly adjacent to the right stabilizer
hinge (Fig. 602). 2) Connect the hose of the hydraulic pump assembly to the jack
assembly with the quick disconnect coupling. 3) Close the release valve on the hydraulic pump assembly. 4) Set the R.H JACK switch on the hydraulic pump assembly to
the RAISE/LOWER position.
5) Adjust the hydraulc ram and set screw on the jack beam assembly to move the support clevis on the jack assembly until it contacts the lower chord of the stabilizer rear spar in both directions.
6) Install the dial indicator below the right stabilizer hinge fitting to measure the vertical motion of the hinge fitting.
7) Set the dial indicator to zero.
CAUTION: DO NOT EXCEED 6,000 PSI (41,370 KPA) LIMIT ON GAGE
__________
HYDRAULIC PRESSURE TO LIFT THE STABILIZER. THIS CAN
CAUSE DAMAGE TO EQUIPMENT.
8) Apply hydraulic pressure so that the jack assembly can lift weight of right side of stabilizer, approximately 4,500 psi (31,030 kPa) on gage.
(c)
Measure the free play at the right stabilizer hinge:
1) Write the free play reading from the dial indicator and refer to it as B, B = _______________ (inches/millimeters).
(d)
Remove the check tool from the right stabilizer hinge.
1) Open the release valve on the hydraulic pump assembly to release hydraulic pressure.
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27-41-02
ALL ú ú 01 Page 611 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(e) Install the right upper truss between the hinge support fitting and the structure. 1) Tighten the nuts to 10-15 pound-inches (1.13-1.70
newton-meters) and re-install the cotter pins.
S 226-017
(3)
Find the free play of the stabilizer hinge:
(a)
Make Y be the free play of the stabilizer hinge.
(b)
The free play Y is the average of the free plays A and B.
(c)
The maximum Y permitted is 0.036 inch (0.91 millimeter).
I.
Measure Free Play at the Left and Right Stabilizer Hinges (Without Check Tool)
S 486-042
(1)
Install the dial indicator below the left stabilizer hinge fitting to measure the vertical motion of the hinge fitting.
(a)
Set the dial indicator to zero.
S 496-046
CAUTION: USE SUFFICIENT PAD ON THE JACKING APPARATUS TO PREVENT DAMAGE
_______ TO THE STABILIZER SURFACE AND DISTRIBUTE THE APPLIED LOAD TO THE STABILIZER STRUCTURE.
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