a) Apply the tape against the floor while removing the backing.
b) If air bubbles trapped under the tape, re-apply by pulling the tape back off the
floor panel and re-smooth it down.
c) Make sure the tape overlap by a minimum of 0.5 in. (12.7 mm) where you
have a splice.
d) Cut the tape approximately 1.5 in. (38.1 mm) from the edge of seat tracks,
entryway gutters, and lavatory/gallery mounts.
2) Position a section of 3M 8663 tape, G02423 or moisture barrier tape, G51340
(optional) with backing still in place, on the entire wet area laying the tape in
forward/aft direction.
a) Mark the tape approximately 1.5 in. (38.1 mm) from the edge of seat tracks,
entryway gutters, and lavatory/gallery mounts.
CAUTION
DO NOT CUT THE WATER SEAL TAPE AGAINST THE FLOOR
PANEL, OR OTHER STRUCTURE. DAMAGE TO THE
STRUCTURE, OR FINISHES ON THE STRUCTURE WILL
OCCUR.
b) Trim the tape at marked locations.
c) Remove the backing from the adhesive side and put the tape on the floor.
Cover any flush lavatory/galley mounts or girt bar attach fittings.
NOTE: Be careful not to stretch the tape while smoothing it down.
d) If air bubbles trapped under the tape, re-apply by pulling the tape back off the
floor panel and re-smoothing it down.
e) Remove the backing from the non adhesive side of the tape.
3) Install the adjacent sections of 3M 8663 tape, G02423 or moisture barrier tape,
G51340 (optional), overlap onto the existing water seal tape by 1 in. (25 mm) to
3 in. (76 mm).
NOTE: An overlap of 2 in. (51 mm) will cause the edge of the waterseal tape splice
and the edge of the seam tape to align. This may show through the
galley/entryway mat.
4) If a section of 3M 8663 tape, G02423 or moisture barrier tape, G51340 (optional)
must be spliced longitudinally for some reason, do these steps:
a) Put down the first section of tape.
b) Apply a bead of sealant, A00247 per BAC5000 to the edge of the waterseal
tape that will be covered by the second section. This fillet will prevent water
from being able to travel under the tape through the small gap left at the edge
of the underlying section of waterseal tape.
c) Apply the second section of 3M 8663 tape, G02423 or moisture barrier tape,
G51340 (optional), overlap the first by 1 in. (25 mm) to 3 in. (76 mm).
NOTE: Too many splices or splices located in the wrong place may cause
excessive tape build up that will show through floor coverings
5) Apply 3M 8663DL tape, G02500 or moisture barrier tape, G51340 (optional) to all of
the 3M 8663 tape, G02423 or moisture barrier tape, G51340 (optional) splices. The
tape must be centered on the overlapping edge of the waterseal tape and shall be
continuous, not spliced at any point.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-21-00
Page 802
D633A101-ILF Feb 15/2018
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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