a) Push the tape down firmly to smooth out the sealant bead.
b) Trim the waterseal tape to the edge of the seat track crown.
3) Center a strip of 3M 8663DL tape, G02500 or moisture barrier tape, G51340
(optional) on the seat track and filler, overlap the previous applied waterseal tape.
a) Extend the tape a minimum of 2 in. (51 mm) past the end of the seat track
cutout.
b) Make sure the seam tape strips is continuous with no splices.
(7) Do these steps to seal lavatory and galley mounts:
(a) Cut a patch of 3M 8663 tape, G02423 or 3M 8663DL tape, G02500 or moisture barrier
tape, G51340 (optional) to either cover flush mounts or to extend into the radius of
protruding mounts.
(b) Extend the tape to overlap onto the existing waterseal tape a minimum of 1 in. (25 mm).
(c) Apply fillet sealant, A00247 to all tape edges where it cut back from the edges of the
mounts.
(d) Apply fillet sealant, A00247 to the edges of any protruding mounts.
(e) Remove the backing from the adhesive side of the tape and push the tape down firmly to
smooth out the sealant bead.
(f) Remove the backing from the non-adhesive side of the tape.
(8) Do these steps to seal lavatory and galley mounts: (Alternative methods)
(a) Method 1
1) Apply fillet sealant, A00247 to the edges of any protruding mounts.
2) Apply the 3M 8663 tape, G02423 or moisture barrier tape, G51340 (optional) to
either cover flush mounts or to the radius of protruding mounts.
3) Remove the backing from the non-adhesive side of the tape.
4) Cut a patch of 3M 8663 tape, G02423 or 3M 8663DL tape, G02500 or moisture
barrier tape, G51340 (optional) to either cover flush mounts or to extend into the
radius of protruding mounts.
5) Extend the tape a minimum of 1 in. (25 mm) beyond the edge of the mount.
6) Remove the backing from the non-adhesive side of the tape.
7) Apply fillet sealant, A00247 to the edges of any protruding mounts.
(b) Method 2
1) Cut a patch of 3M 8663 tape, G02423 or 3M 8663DL tape, G02500 or moisture
barrier tape, G51340 (optional) to either cover flush mounts or to extend into the
radius of protruding mounts.
a) Extend the tape a minimum of 1 in. (25 mm) beyond the edge of the mount.
b) Remove the backing from the non-adhesive side of the tape.
c) Apply sealant to the outer edges of the patch.
2) Apply the 3M 8663 tape, G02423 or moisture barrier tape, G51340 (optional) to
overlap the patch.
a) Remove the backing from the non-adhesive side of the tape.
b) Apply sealant, A00247 to the inner edges of the tape.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-21-00
Page 805
D633A101-ILF Feb 15/2018
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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