(5)
Apply the masking tape on the large slots and holes.
(6)
Remove the masking tape after the sealant is mixed.
S 392-055
(7)
Apply the compound to the pressure side of the hole with a spatula or applicable tool.
S 952-053
S 952-054
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
51-31-01
ALL ú ú 01 Page 209 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
HOLE SEAL
Hole and Slot Seal Figure 203
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
51-31-01
ALL ú ú 01 Page 210 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 392-056
(8)
Apply the compound tightly into the hole or slot.
S 392-057
(9)
Make the compound smooth with the adjacent surfaces.
TASK 51-31-01-392-058
7. Fillet Seal Application
_______________________
A. Equipment
(1)
Fillet Fairing Tools
(2)
Sealing gun and nozzles
B. Procedure
S 302-059
(1)
Do the Prepare for Sealing task.
S 392-060
(2)
Apply the sealant with a flow gun.
S 392-061
(3)
Put the nozzle tip into the seam.
S 212-062
(4)
Make sure the sealant is applied in a straight line (Fig. 204).
S 392-063
(5)
Push the bead of the sealant forward of the nozzle head.
S 212-064
(6)
Push the sealant tightly into position with the fairing tool. Make sure you get a smooth fillet.
S 392-065
(7)
Apply the sealant again to get a full body fillet.
NOTE: A second application of the sealant is necessary only for
____ integral fuel tanks. You can cut the nozzle tip to give the full body seal some contour.
S 392-066
(8)
Use the fairing tool to get the last shape of the fillet.
S 392-067
(9)
Push the tool against the sealant and move the tool parallel to the bead.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
51-31-01
ALL ú ú 01 Page 211 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
Fillet Seal
Figure 204
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
51-31-01
ALL ú ú 01 Page 212 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 212-068
(10)
Make sure the seal is smooth. Make sure there are no air bubbles in the seal.
S 212-069
(11)
Make sure the bead has the shape of a faired fillet, after the work is completed.
TASK 51-31-01-392-070
8. Fastener Seal Application (Fig. 205)
_________________________
A. General
(1)
If the fasteners were installed during the pot life of the sealant, sealing is not necessary.
(2)
Install rivets dry, unless you are told differently.
NOTE: Install 5056 aluminum rivets wet with sealant in aluminum
____ structure. Install 5056 aluminum rivets dry in magnesium structure.
(3) Use the specified procedure for fastener sealing for corrosion prevention.
NOTE: When a procedure is not specified, use procedure 1.
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 結構 STRUCTURES(75)
