POLYURETHANE WATERSEAL - REPAIRS
1. General
A. This procedure contains the task to repair polyurethane waterseal on passenger floors in wet areas
of the aircraft, which are defined as that part of the floor that is local to doorways, galleys and
lavatories.
B. The waterseal installation is intended to reduce corrosion of floor structure by preventing liquids
spilled in wet areas from traveling below floor level.
TASK 53-21-00-300-801
2. Repair the Polyurethane Waterseal
Figure 801
A. Consumable Materials
Reference Description Specification
A00247 Sealant - Pressure And Environmental -
Chromate Type
BMS5-95
G02423 Tape - Moisture Barrier - 3 Feet Wide - 3M
8663
G02500 Tape - Moisture Barrier - 4 inch Wide - 3M
8663DL
G50179 Tape - Moisture Barrier, Adhesive One-side,
Clear Polyurethane
BMS8-346 Type I
G51340 Tape - Moisture Barrier, Adhesive One-side BMS8-346 Type II Class
4
B. Location Zones
Zone Area
200 Upper Half of Fuselage
C. Procedure
SUBTASK 53-21-00-420-001
(1) If the tape shows deterioration or damage because of the floor panel removal, install the new
polyurethane tape.
SUBTASK 53-21-00-420-005
(2) Do these steps to install the moisture barrier:
(a) Make sure the floor panels and the seat tracks are clean according to BAC5750 before
you install the moisture barrier.
(b) Install the polyurethane moisture barrier in the wet areas of the floor structure as follows:
NOTE: The moisture barrier must be, as much as possible, one continuous piece. Do not
try to fit the moisture barrier below lavatories or galleys where removal of these
fixtures is necessary.
The maximum permitted overlap between two pieces of the moisture barrier is
4 in. (102 mm).
1) Center the moisture barrier tape, G50179 on floor panel joint to cover sealant and
fasteners/inserts.
NOTE: The moisture barrier tape, G50179 is applied only to joints between two
floor panels and not to other structure including seat track, gutters, lavatory
and galley mounts, crease beams and partition walls.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-21-00
Page 801
D633A101-ILF Feb 15/2018
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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