SUBTASK 53-21-00-420-003
(13) Apply the sealant, A00247, or sealant, A02315 (preferred), as follows:
(a) Apply the sealant, A00247, or sealant, A02315, in the clearance between the floor panel
and the crease beam in the wet area that follows:
1) From station 344.00 to station 380.00.
(b) Apply the sealant, A00247, or sealant, A02315, to the remaining wet area to prevent
corrosion:
1) The remaining openings between the floor panels.
2) The seat tracks.
3) The bulkheads.
4) The mounting hard points.
5) The door drain gutter.
6) The mop sill.
SUBTASK 53-21-00-390-006
CAUTION
DO NOT CAUSE A BLOCKAGE WHEN YOU APPLY SEALANT NEAR OR
AROUND THE FUSELAGE DRAIN HOLES, TUBES, OR PATHS. THE
FUNCTION OF THE DRAIN HOLES IS TO DRAIN CONDENSATION AND
FLUIDS OVERBOARD. IF YOU CAUSE A BLOCKAGE, FLUIDS WILL
COLLECT IN THE AIRPLANE. THE FLUIDS CAN CAUSE DAMAGE TO THE
STRUCTURE OR A FIRE IF THE FLUIDS ARE FLAMMABLE.
(14) If you apply Flexane-80 resin, A00306, do these steps:
(a) Install the sleeve, G50029, around the edges of the panel.
(b) Apply the Devcon Flexane FL-20 primer, C00953.
(c) Apply the Flexane-80 resin, A00306 (alternate), with a sealant gun, STD-449, or
hardwood or plastic fillet smoothing spatula, STD-810.
(d) Make sure that there are no air bubbles when you apply the sealant.
(e) Use a hardwood or plastic fillet smoothing spatula, STD-810, to make the seal smooth
with the Scotch Flatback Masking Tape 250, G00270.
SUBTASK 53-21-00-390-007
(15) Make the edges of the seal smooth.
(a) Remove all of the unwanted compound with hardwood or plastic fillet smoothing spatula,
STD-810.
(b) Remove the Scotch Flatback Masking Tape 250, G00270, after the seal is smooth or let
the Scotch Flatback Masking Tape 250, G00270, stay during the curing time.
(c) Install the moisture barrier if it is applicable, do this task: Repair the Polyurethane
Waterseal, TASK 53-21-00-300-801.
SUBTASK 53-21-00-400-004
(16) If the entry and service area floor covering was removed, install it (Entry and Service Area
Floor Covering - Installation, TASK 25-27-21-400-801).
SUBTASK 53-21-00-390-013
(17) Apply the moisture barrier tape, G51340, and fabric, G51339, to the moisture barrier tape
covered floor panels (Figure 401).
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-21-00
Page 414
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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