S 214-011
(5)
Examine the components as follows for damage:
(a)
The wingtip.
(b)
The wing closure rib.
(c)
The fitting bushings.
(d)
The skin.
(6)
Clean and repair the areas if it is necessary.
S 424-013
(7)
Install the winglet.
S 104-012
(a) Make sure that the washers bonded to the aft fitting on the winglet and to the forward fittings on the wingtip are in their position.
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S 434-013
(8) If you cannot find the washer, continue as follows:
(a)
Remove the remaining sealant from the fitting.
(b)
Bond a new washer to the fitting with BMS 5-95.
S 424-014
(9) Continue to install the winglet.
(a)
Make sure that the drain holes in the root rib of the winglet have no blockage.
(b)
With the recommended hoist, load positioner and sling, lift the winglet into its position on the wingtip.
(c)
Apply grease to the bolts before you install them.
(d)
Install the aft bolts, washers and self-locking nuts.
(e)
Use the recommended tool on the forward side of the aft fitting to hold the two aft bolts while you torque the nuts.
(f)
Make sure the run-on torque is a minimum of 285 pound-inches.
1) If the run-on torque is less than 285 pound-inches, discard the nut and install a new nut.
(g)
Torque the nut from 3000 to 4000 pound-inches.
(h)
Install the forward bolt, washer and self-locking nut.
(i)
Make sure that the run-on torque is a minimum of 90 pound-inches. 1) If the run-on torque is less than 90 pound-inches, discard
the nut and install a new nut.
(j)
Torque the nut from 800 to 1100 pound-inches.
S 094-014
(10)
Remove the sling.
S 434-015
(11)
With wet sealant, install the winglet screws at each sling attach point.
S 434-019
(12)
Attach the ground straps.
(a) Use a bonding brush to clean the fitting surfaces and the ground strap where the strap attaches to the fitting.
NOTE: The surface must be smooth and shiny.
____
(b)
Apply Alodine to the cleaned surfaces.
(c)
Attach the ground straps with the bolts, washers, and
self-locking nuts.
(d)
Measure the bonding resistance between the ground plates on the winglet and the wingtip.
NOTE: The maximum permitted resistance is 0.0025 ohms.
____
(e) Paint the attach points of the ground straps with primer.
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747-400 MAINTENANCE MANUAL
(f) After you apply the primer, apply a fillet seal between the ground strap and the ground plate.
S 414-016
(13) Install the mid fairing.
(a)
Examine all the nutplates for loose fasteners and make sure they are all there.
(b)
Repair if it is necessary.
(c)
Put the aft outboard section in its position.
(d)
Install the screws.
(e)
Put the aft inboard section in its position.
(f)
Install the screws.
(g)
Put the splice channels in their positions on the aft inboard and the aft outboard sections.
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