51-21-91
ALL ú ú B02 Page 708 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
FLOOR TRACK CORROSION PREVENTION - MAINTENANCE PRACTICES
________________________________________________________
1. General
_______
A. This procedure contains one task. The task is to prevent floor track against corrosion.
B. The floor track corrosion usually is below the galleys, the galley work areas, or other limited lengths of the floor track areas that are easy to have corrosion.
TASK 51-21-92-302-001-B00
2. Floor Track Corrosion Prevention (Fig. 201)
________________________________
A. Consumable Materials
(1)
A00302 Sealant - BMS 5-125, Class B Pressure,
Environmental, and Fuel Cavity Sealant
(2)
C00308 Corrosion Preventive Compound -MIL-C-11796, Class 2 or Class 3
(3)
C00064 Conversion Coating - MIL-C-5541
(Alodine 1200)
(4)
C00666 Primer - Aluminized Epoxy
(5)
G00125 Tape - Permacel 306
(6)
G00088 Fiberglass Strip - BMS 8-2, Type 35
(Conolite) .035-inch thick, 1.5-inch
wide, length as necessary
B. References
(1) AMM 53-21-11/801, Water Barrier
C. Access
(1) Location Zone
100 Upper Half of the Fuselage
D. Procedure
S 142-002-B00
(1)
Clean the floor tracks that have corrosion prevention materials (CPM 20-40-00, Corrosion Prevention Manual).
S 142-003-B00
(2)
Apply the alodine 1200 and BMS 10-11 epoxy primer on all the cleaned areas of the floor track.
NOTE: You can use aluminized epoxy primer as an alternative to
____
BMS 10-11 primer.
S 392-004-B00
(3)
Apply the sealant on the fastener heads of the floor track.
S 392-005-B00
(4)
Use the sealant to make dams on the floor tracks at the end of the cleaned areas and approximately 6 inches apart at the galley tie-down well locations.
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51-21-92
ALL ú ú B01 Page 201 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
GALLEYS (EXAMPLE)
A A
FLOOR TRACK SEE A
GALLEY TIE-DOWN (EXAMPLE)
ONE SEALANT DAM AT THE END OF PROTECTED AREA
FILLER CHANNEL (PLASTIC, WOOD, OR RUBBER SOLID FILLER BLOCK OPTIONAL)
FLOOR PANEL SEAT TRACK
FLOOR
TRACK
COVER STRIP 1
TWO SEALANT DAMS IN THE GALLEY TIE-DOWNWELL AREA 6.00 INCHES APPROXIMATELY
GALLEY TIE-DOWN WELL AREA +0.25
INCHES1.00
-0.00
PROTECTED AREA
FLOOR TRACK
A
WATER
BARRIER
GREASE
A-A
1 THE COVER STRIP IN THE WALKWAY AREAS ONLY NOT USED BELOW THE GALLEYS.
Floor-Track Corrosion Prevention Figure 201
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51-21-92
ALL ú ú B01 Page 202 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 342-006-B00
(5) Cut the non-metallic filler to attach between the dams in the floor track, but not at the galley tie-down well locations.
NOTE: You can make the filler from BAC1522-148 extrusion, or the
____
square section of the plastic, rubber or wood.
S 342-007-B00
(6) Melt the grease to liquid condition and not fully fill the grease on the floor track between the dams.
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