WATER BARRIER - REPAIRS
1. General
A. This procedure contains two tasks. The first task is the repair of the vinyl part of the water barrier.
The second task is the repair of the mylar part of the water barrier.
B. The water barrier has mylar sheets (transparent), vinyl sheets (nontransparent) or 18 in. (457 mm)
wide strips of tape bonded to the floor panels. This procedure gives instructions on how to cut the
water barrier for the removal of a floor panel. It also gives instructions on how to repair the water
barrier with the floor panel installed.
C. The vinyl tape at right angles to the seat tracks with a 1.00 in. (25.40 mm) overlap is the preferred
replacement of the water barrier.
D. Cut through the water barrier around the edges of the floor panel to remove the floor panel. Pull
back the vinyl to get to the fasteners for the floor panels. If mylar is on the floor panel fasteners, cut
a circular patch for each fastener.
TASK 53-21-11-300-801
2. Vinyl Water Barrier Repair
A. Consumable Materials
Reference Description Specification
A00247 Sealant - Pressure And Environmental -
Chromate Type
BMS5-95
A50464 Tape - Vinyl, Adhesive Coated BMS5-179
G00157 Tape - Nitto P-306L (use until stock depleted)
B. Location Zones
Zone Area
200 Upper Half of Fuselage
C. Procedure
SUBTASK 53-21-11-350-001
(1) Apply the Nitto P-306L tape, G00157 or tape, A50464 vinyl tape at right angles to the seat
tracks with a minimum of a 1.00 in. (25.40 mm) overlap.
SUBTASK 53-21-11-390-001
(2) Apply a sealant, A00247 to the tape overlap.
NOTE: You can use 3.00 in. (76.20 mm) wide tape on the edge of the overlap as an
alternative to the sealant.
END OF TASK
TASK 53-21-11-300-802
3. Mylar Water Barrier Repair
A. References
Reference Title
53-21-00-400-801 Passenger Cabin Floor Panel - Installation (P/B 401)
B. Consumable Materials
Reference Description Specification
A00156 Adhesive - For Bonding Mylar And Nylon, 2
Part, RT Cure
BMS5-31
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-21-11
Page 801
D633A101-ILF Oct 15/2018
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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