TM-1-1500-344-23-2
AIRCRAFT VOLUME II
TECHNICAL MANUAL; CLEANING AND CORROSION CONTROL
APRIL 2009
TM-1-1500-344-23-2 - Page 139 of 240
7-23
NAVAIR 01-1A-509-2
TM 1-1500-344-23-2
15 April 2009
7-8.5. FUEL CELLS. Refer to NAVAIR 01-1A-35,
TM 55-1500-204-25/1, or applicable Structural Repair
Manual (SRMs) for sealant procedures.
7-8.6. EXTERNAL AIRCRAFT STRUCTURE. If, during
normal maintenance, it becomes necessary to remove
and replace components (wing planks, skin, spar caps,
fasteners, or fittings), they shall be sealed when
reinstalled, even if they were not sealed originally. The
only exception to this requirement is temporary repair
accomplished for a one time flight to a Depot or overhaul
facility. See Figures 7-15 through 7-18 for typical sealing
methods.
7-8.7.
DEPRESSIONS. When the thickness of metal
is reduced by more than 15 mils (0.015 inch) during
removal of corrosion damage, fill the depression with
Figure 7-15. Typical Lap Skin Sealing
1.
Assemble lap joint with MIL-PRF-81733 in faying surfaces
2.
Install fasteners wet with MIL-PRF-81733
3.
Fillet seal all external seams with MIL-PRF-81733
4. Apply appropriate paint system
1.
Fillet seal all external seams with MIL-PRF-81733
2.
Install fasteners wet with MIL-PRF-81733
3.
Apply appropriate paint system
1
MIL-PRF-81733
2
3
2
1
A.
Where Skins Have Been Lifted
B.
Where Joints Have Not Been Opened
Figure 7-16 Sealing Procedures for
Typical Aircraft Fitting
NOTE:
Fill all voids
1.
Remove corrosion and surface treat
in accordance with Chapter 4 and 5.
2.
Apply MIL-PRF-81733 sealant to all faying surfaces.
3.
Install all fasteners wet with MIL-PRF-81733.
4.
Fillet seal all external joints with MIL-PRF-81733.
5.
Coat with appropriate paint system.
1
2
3
3
5
4
4
4
MIL-PRF-81733 Type II sealant after applying chemical
conversion coating (MIL-DTL-81706) and priming
(MIL-PRF-23377 or MIL-PRF-85582). Depressions on
surfaces that will be sealed with AMS 3255 sealing tape
require filling with compensation tape (see paragraph
7-7.7). Depressions on the inside of integral fuel tanks
do not require filling.
7-8.8.
EXTENSIVE CORROSION REPAIR. If
corrosion damage is so extensive that structural repair
is necessary, all faying surfaces between patches (or
doublers) and skins shall be painted with one coat of
Back to Top
