54-51-02
ALL ú CONFIG 3 ú 10N Page 441 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
b) Do a check to make sure that the bolt, end caps, washers, nut, and cotter pin are installed correctly.
c) Apply sealant, approximately 0.10 inch (2.54 mm) thick, to both ends of the cotter pin to prevent cotter pin movement.
6) Make sure the joint is clamped. a) A minimum gap of 0.020 inch (0.51 mm) is required in the joint.
NOTE: The gap may be located between either of the
____ end caps (13 and 20) and the applicable bushing flange of the diagonal brace.
7) Do a check to make sure that the clearance between the diagonal brace and the hold open rod eyebolt threads is a minimum of 0.03 inch. a) Add washers as required under the eyebolt head to meet
the clearance requirement. b) Make sure that at least two threads protrude from the nut.
(b) ON OUTBOARD STRUTS; Do these steps (Fig. 403): 1) Apply a thin coat of grease to the attach bolt (13). 2) Apply antiseize compound (Never-Seez or equivalent) to the
threads of the self-locking nut (19).
3) Install the attach bolt (13).
a) If a slug is installed, install the washer (12) on the greased bolt (13) and push out the slug with the greased bolt. Make sure the clevis and lug stay aligned.
CAUTION: DO NOT EXCEED AN UPLOAD OF 1500 POUNDS OR
_______ DOWNLOAD OF 500 POUNDS TO INSTALL THE DIAGONAL BRACE. THE LOAD THAT RESULTS CAN CAUSE DAMAGE TO THE DIAGONAL BRACE WHEN INSTALLATION IS COMPLETED.
b) If necessary, change the load on the strut to align the clevis and lug or to make the brass slug free to move. 1 If you cannot install the diagonal brace in the
_ allowable load range, you must install a new diagonal brace.
4) Install the washer (20), and the nut (19) on the threaded end of the bolt (13). 5) Do a check of the self-locking torque of the nut (19). a) If the self-locking torque is not 195-1250 pound-inches (22.2-142.5 N.m), replace the nut.
NOTE: The torque wrench must be installed on the
____ nut and not the head of the bolt.
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54-51-02
ALL ú CONFIG 3 ú 10N Page 442 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
6) Tighten the nut (19) to 1600-1900 pound-inches (182.4-216.6 N.m). 7) AIRPLANES WITH SB 747-54-2181; Tighten the nut (19) to 2100 to 2400 pound-inches
(237.27 to 271.16 Nm). a) Do a check to make sure that the torque value is correct. 8) Install the bolt (14), washers (15 and 18), and nut (17). a) Tighten the nut (17) with your hand.
9) Make sure the washer (18) is correctly seated on the end of the bolt (13), and the nut (17) is correctly seated on the washer (18).
10) Install the cotter pin (16).
a) Tighten the nut (17) to 50-200 pound-inches to align the hole for the cotter pin (16). 1 You can install a maximum of three adjustment
_ washers, between the nut (17) and the primary washer (18), to align the hole for the cotter pin (16).
b) Do a check to make sure that the bolt, washers, nut, and cotter pin are installed correctly.
c) Apply sealant, approximately 0.10 inch (2.54 mm) thick, to both ends of the cotter pin to prevent cotter pin movement.
(c) Examine the clamps on the diagonal brace that route the electrical conduits and the pneumatic duct. 1) Make sure that the extended bolt threads do not touch the
trailing edge door when it is closed.
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