S 392-058-B00
(7)
Make the edges of the seal smooth. Remove all the unwanted compound with a wooden or plastic tool.
TASK 51-31-00-392-059-B00
10. Electrical Fitting Seal Application
___________________________________
A. General
(1) BMS 5-37 sealant is the recommended sealant for the electrical seal fittings. BMS 5-26, BMS 5-32, and BMS 5-95 sealants will do the same function as the BMS 5-37. But, BMS 5-26, BMS 5-32, and BMS 5-95 are not the recommended sealants because they will bond to electrical wires which do not have a teflon coating. It is not easy to do maintenance on electrical seal fittings that have sealant bonded to the electrical wires.
B. Equipment
(1)
Fillet Fairing Tools
(2)
Sealant Removal Tool - made from wood or
plastic 3/16 inch thick, 8 inches long in 1/4,
1/2 and 3/4 inch widths.
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737-300/400/500MAINTENANCE MANUAL
(3)
Spatula made of wood or plastic
(4)
Sealing gun and nozzles
C. Consumable Materials
(1) G00138 Masking Tape - Permacel No. 70 or 85,
American Tuck No. 210; 3/4 inch wide and
1-1/2 inch wide
D. Procedure
S 302-060-B00
(1)
Do the Prepare for Sealing task.
S 392-061-B00
(2)
Seal the multiple cutouts in the primary sealing areas as follows:
(a)
Put the wire bundle through an available cutout.
(b)
Isolate the wires before you apply the seal: 1) If there are three or less wires, use the plastic separators to isolate the wires.
2) If there are four or more wires, use the wire coil separators to isolate the wires. Wind the wire coil separators two to four turns around each wire.
(c)
Assemble the fitting together around the wires. Make sure the flange of the fitting is on the pressurized side of the airplane.
NOTE: A fitting is made of two halves.
____
(d)
Make sure the plastic separators or the wire coil separator is satisfactorily installed on the wires in the bulkhead fitting.
(e)
Put a 8 inch long string against the bulkhead fitting and parallel with the wires.
(f)
Wind three turns of 1-1/2 inch wide masking tape around the fitting.
(g)
Crimp the 1-1/2 inch wide masking tape around the bulkhead fitting. Make sure the wires are in the center of the bulkhead fitting and the masking tape.
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MAINTENANCE MANUAL
FITTING FITTING
PLASTIC SEPARATOR
WIRE COIL
SEPARATOR
INSTALLATION OF SEPARATORS
FITTING
1 1/2-INCH WIDE MASKING TAPE
3/4-INCH WIDE MASKING TAPE
RIP STRING INJECTION HOLE
BULKHEAD FITTING
FILLET SEAL
FITTING
FASTENER
1 1/2-INCH WIDE FILLER MASKING TAPE
3/4-INCH WIDEMASKING TAPE
COVER PLATE
STRING
INSTALLATION OF BULKHEAD FITTING
Electrical Fitting Seal Figure 206
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(h)
Wind three turns of 3/4 inch wide masking tape around the 1-1/2 inch wide masking tape.
(i)
Put the bulkhead fitting, cover plate and the filler in position on the not pressurized side of the airplane. Install the fasteners.
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