(b)
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.
S 432-098
(4) 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.
____
S 432-099
(5) On BACS45B type seal fittings, do these steps:
(a)
Fill the clearance between the snap ring groove and the structure with seal rings.
(b)
Install the snap ring.
S 392-100
(6) Seal the multiple cutouts in the primary sealing areas as follows:
(a)
Make sure the plastic separators or the wire coil separator is satisfactorily installed on the wires in the bulkhead fitting.
(b)
Put a 8-inch long string against the bulkhead fitting and parallel with the wires.
(c)
Wind three turns of 1 1/2-inch wide masking tape around the fitting.
(d)
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.
(e)
Wind three turns of 3/4-inch wide masking tape around the 1 1/2-inch wide masking tape.
(f)
Put the bulkhead fitting, cover plate and the filler in position on the unpreesurized size of the airplane. Install the fasteners.
(g)
Make an injection hole in the 1 1/2-inch wide masking tape at an applicable location.
(h)
Use the sealing gun to apply the sealant. Apply the sealant until it comes out from the flange of the bulkhead fitting.
(i)
Apply the sealant to make a fillet seal on the filler.
(j)
Apply the sealant on the fastener that is in the center of the filler.
(k)
Let the sealant cure for 16 to 24 hours.
(l)
Pull the string to remove the masking tape.
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A
747-400
MAINTENANCE MANUAL
FITTING FITTING
PLASTIC SEPARATOR
WIRE COIL
SEPARATOR
INSTALLATION OF SEPARATORS
MASKING TAPE 1-1/2-INCH WIDE PRESSURE SIDE
FITTNG SEAL FITTING
3/4-INCH WIDE MASKING TAPE STRING HOLE INJECTION SNAP RING SEALING RING STRUCTURE
BULKHEAD FITTING (BACS45A) BULKHEAD FITTING (BACS45B)
Electrical Fitting Seal
Figure 207 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C26033
A
747-400
MAINTENANCE MANUAL
1-1/2-INCH WIDE
MASKING TAPE
FITTING
3/4-INCH WIDE MASKING TAPE
STRING INJECTION HOLE
ASSEMBLY OF BULKHEAD FITTING
FILLET SEAL FAYING SURFACE SEAL
FASTENER FILLET SEAL FITTNG
FASTENER
1-1/2-INCH WIDE MASKING TAPE
COVER PLATE
FILLER COVER PLATE
STRING
3/4-INCH WIDE
MASKING TAPE
INSTALLATION OF BULKHEAD FITTING INSTALLATION OF COVER PLATE
Electrical Fitting Seal
Figure 207 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
51-31-01
ALL ú ú 01 Page 227 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 392-085
(7)
Do the steps above to seal the multiple cutouts in the intermediate sealing areas. Do not use the coil spacers.
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