NOTE: Each strip will overlap by at least one inch.
____
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 (c)  Apply an additional four-inch wide piece of 3M 0.018 inch thick 8663DL polyurethane tape to cover each area of overlap and along the side of body.
 S 848-008-B00
 (3)  Put the airplane back to its usual condition.
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 WATER BARRIER - APPROVED 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-inch 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-inch 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 53-21-11-308-001-B00
 2.  Repair the Vinyl Water Barrier
______________________________
 A.  Consumable Materials
 (1)  
G00157 Tape - Permacel 306, 10 mil thick by 18
 inches wide

 (2)  
G02304 Tape - Moisture Barrier BMS8-346

 B.  Access
 (1)  Location Zones
 100 Upper Half of the Fuselage

 C.  Procedure - Repair the Vinyl Water Barrier
 S 358-002-B00
 (1)  
Apply the vinyl or BMS8-346 tape at right angles to the seat tracks with a minimum of a one-inch overlap.

 (2)  
Apply a sealant to the tape overlap.

 S 398-003-B00
 NOTE: You can use three-inch wide tape on the edge of the
____ overlap as an alternative to the sealant.
 TASK 53-21-11-308-004-B00
 3.  Repair the Mylar Water Barrier
______________________________
 A.  Consumable Materials
 (1)  
B00083 Solvent - aliphatic naphtha

 (2)  
A00024 Adhesive - Pro-Seal 501 with Pro-Seal 501-A Accelerator

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 B.
C.
D.
E.
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737-300/400/500MAINTENANCE MANUAL
 (3)
G00111 Mylar Sheet - Type A, 0.010 inch thickReferences

 (1)
53-21-00/401, Passenger Cabin Floor PanelsAccess

 (1)  
Location Zones 100 Upper Half of Fuselage

Prepare for the Repair of the Mylar Water Barrier
 S 418-005-B00
 (1)  
Install the floor panels (Ref 53-21-00/401).

 S 358-006-B00

 (2)  
Cut strips of the mylar to make a splice with the edges of the floor panel.

 NOTE: The splice must make a 0.75-inch overlap with the
____ fastener line and adjacent floor panel 3/4 inch.
 S 148-007-B00
 (3)  
Clean the mating surfaces with aliphatic naphtha.

 S 358-008-B00