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757
MAINTENANCE MANUAL
S 368-049
(11)
Raise the seal plane (Fig. 817).
(a)
You can replace an injection, prepack, or faying surface seal, or you can raise the seal plane to isolate a defective seal from the fuel.
NOTE: Because you add a large quantity of sealant when you
____ raise the seal plane, it is better to replace the defective seal.
1) Examine the structure around the bad seal to find where to raise the seal plane.
2) Apply a new fillet seal around the structure that with the applicable seals and fasteners to raise the seal plane (Fig. 817).
0.03 INCH THICK)
AFTER ASSEMBLYBEFORE ASSEMBLY
Faying Surface Seal Figure 816
C76355
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MAINTENANCE MANUAL
NEW FILLET
ORIGINAL FILLET SEAL PREPACK SEAL
A-A
Raise the Seal Plane to Repair a Defective Prepack Seal
Figure 817
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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757 MAINTENANCE MANUAL
TASK 28-11-00-308-050
5. Repair of Fuel Tank Corrosion_____________________________
A. General
(1)
To repair fuel tank corrosion, the applicable surfaces in the fuel tank must be cleaned and treated with etchant and alodine. Corrosion resistant finish (topcoat) is then applied to the surfaces to prevent more corrosion. Be careful to clean and treat all corners, crevices and other limited access areas.
B.
Consumable Materials
(1)
B00184 Cleaning Solvent - BMS 11-7
(2)
G00011 Etchant - TEC 361
C.
References
(1)
SRM 51-20-01, Protective Treatment of Metallic and Graphite Materials
D.
Access
(1)
Location Zones
133 Wing Center Section (Left)
134 Wing Center Section (Right)
531 Center Wing Tank (Left)
541 Main Tank - Rib No. 5 to No. 17 (Left)
542 Main Tank - Rib No. 17 to No. 21 (Left)
543 Surge Tank - Rib No. 21 to No. 23 (Left)
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