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ALL ú ú 01 Page 509 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(b) To get the necessary clearance at the trailing edge, make the adjustment as follows: 1) Turn the tube of the tie rod at rib number 1 to adjust the
height of the trailing edge panel.
WARNING: THE LINKS THAT CONNECT THE TORQUE TUBE AND THE DIAGONAL
_______ TIE RODS AT RIBS NUMBER 1 AND 2 ARE PRELOADED. TO REMOVE ALL POSSIBLE PRELOAD, YOU MUST MAKE SURE YOU INSTALL THE RIB INSTALLATION TOOL CORRECTLY. THIS WILL PREVENT POSSIBLE PERSONNEL INJURY WHEN YOU DISCONNECT THE LINKS OF THE TORQUE TUBE OR THE TIE RODS.
(c) If you cannot turn the tie rods, remove the preload from the tie rods and ribs number 1 and 2 linkages as follows: 1) Disconnect the upper end of the vertical tie rod of Rib 2
near the top of the landing gear beam. 2) Make a record of the length of the rod because you must not change the length of the rod. 3) If it is not easy to remove the pin, push up on the panel lower surface.
NOTE: This will release the weight from the panel and any
____ preload caused by the deflection of the landing gear beam.
4) Install the rib installation tool as shown in view B-B. a) Pin the eyehook of the tool to the upper panel fitting. b) Pin the opposite end of the tool to the hole not used
in the torque fitting. 5) Adjust the tool. a) Turn the handwheel of the installation tool make the tool smaller.
NOTE: This will permit you to easily remove the bolt
____
from the tie link.
b) Disconnect one end of the tie link and turn the handwheel of the installation tool.
NOTE: This will open the tool until the preload is
____ fully removed from the torque tube.
(d)
Put the straightedge (8 ft) on top of the panel at the trailing edge to examine the flat condition along the span.
(e)
If the panel at the trailing edge is not flat to 0.06 inch, continue as follows: 1) To get the trailing edge to the necessary flat condition,
you must turn the diagonal tie rod on Rib number 2. 2) If you cannot turn the tie rods, remove the preload from the tie rods as shown above.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
(f) Before you use the tool, make the necessary adjustments and then preload the torque tube as follows: 1) Turn the handwheel of the tool to make the tool smaller. 2) Continue this step until you can install the bolt in the
tie link after you install all the other bolts. 3) Turn the handwheel of the tool to loosen it until you can
remove the tool. 4) Attach the upper end of the vertical tie rod. 5) Tighten the nut from 30 to 60 pound-inches.
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