54-51-02
ALL ú CONFIG 3 ú 10N Page 437 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
2) Install the fuse pin (35), the two washers (38 and 39), and the nut (37).
NOTE: The fuse pin head direction is optional.
____
a) Tighten the nut (37) to 1500-2000 pound-inches (171.0-228.1 N.m). 1 Do a check to make sure that the torque value is
_
correct.
3) Install the cotter pin (36).
a) You can install a maximum of three adjustment washers, between the nut (37) and the washer (38), to align the hole for the cotter pin (36).
b) Do a check to make sure that the fuse pin, 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.
S 424-015-003
(5) Install the diagonal brace aft fuse pin.
(a)
If the diagonal brace assembly was removed and you do not install a new diagonal brace, make sure you install the diagonal brace assembly that was identified for this airplane and strut location.
(b)
If you install a new diagonal brace, do these steps: 1) Remove the engine if it is installed (AMM 71-00-02/401).
NOTE: This will allow measurement for, and installation
____ of the new brace with no load applied to the strut.
2) Use the MIT SM311U2730 measuring tool to determine the required distance between pin centers, from wing fitting to the strut lower spar fitting, with no load applied to the strut. a) Do not change the load on the wing or the strut, from
the time the distance is measured to the time the new brace is installed.
NOTE: If the load condition is changed, the
____ diagonal brace cannot be installed unless a preload is applied to the strut.
3) Install the bushing at the required location, on the aft end of the diagonal brace (OHM 54-00-01).
4) Tag the brace with the bore center-to-center distance, basic airplane number, and strut location, or make sure this data is marked on the brace. Apply a clear enamel overcoat over the tag data.
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54-51-02
ALL ú CONFIG 3 ú 10N Page 438 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(c) ON INBOARD STRUTS; Do these steps (Fig. 402): 1) Apply a thin layer of grease to the fuse pin (12). 2) Apply antiseize compound (Never-Seez or equivalent) to the threads of the self-locking nut (5). 3) Install the fuse pin (12).
a) If a slug is installed, push it out with the new greased pin (12). 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. EXCEEDING THESE LIMITS 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 (4) and nut (5) on the threaded end of the fuse pin (12). 5) Do a check of the self-locking torque of the nut (5). 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.
6) Tighten the nut to 1600-1900 pound-inches (182.4-216.6 N.m). a) Do a check to make sure that the torque value is
correct. 7) Install the end cap (11) with the bolt (10) and two washers (8 and 9). 8) Install the nut (7) and tighten with your hand.
a) Make sure the washer (8) is correctly seated on the front end of the fuse pin (12), and the nut (7) is correctly seated on the washer (8).
9) Install the cotter pin (6). a) Tighten the nut (7) to 50-200 pound-inches to align the hole for the cotter pin (6).
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