TM 55-1520-240-23-4
5-137.1
REPAIR COMPOSITE WEATHER-PROTECTIVE COVER (AVIM)
(Continued)
5-137.1
BOND AND CURE REPAIR
110.
Cover repair (44) with sheet of peel ply (E270)
(45) and sheet of Teflon-impregnated fabric
(E170) (46). Each sheet shall be large enough to
overlap repair 1 inch in all directions.
111.
Cover Teflon-impregnated fabric (E170) (46) with
rubber pad (E318) (47). Cover rubber pad with
glass cloth (E132) (48).
112.
Surround cloth (E132) (48) with border (49) of
sealing tape (E396). Keep tape clear of cloth.
113.
Attach tube (50) to vacuum pump hose. Wrap
end of tube with two layers of glass cloth (E132)
(51). Secure cloth to tube with masking tape
(E388) (52).
114.
Place tube (50) on glass cloth (E132) (48). Wrap
tube with sealing tape (E396) (52) where tube
crosses border (49) of sealing tape (E396).
115.
Press tube (50) against tape (49 and 52) to make
an airtight seal. Check that glass cloth (51) on
end of tube (50) is in direct contact with layer of
glass cloth (48).
116.
Cover area with polyvinyl sheet (E284) (53).
Press sheet smoothly against tape (49) to make
an airtight seal.
117.
Start vacuum pump. Set pump for vacuum of
about 30 inches Hg.
118.
Shut off pump. Vacuum shall not drop more than
5 inches Hg in 5 minutes. Reposition polyvinyl
sheet (53) or add tape (E396) (49 or 52) as
needed.
119.
Start pump again. Maintain vacuum of at least
20 inches Hg throughout adhesive cure.
5-773
