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21-22-11
ALL ú ú 01.1 Page 808 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
ú (f) Bond the insulation to the duct if necessary to hold the
ú insulation in position prior to the tape application as
ú follows:
ú 1) Use the instructions in Boeing Standard Overhaul Practices
ú Manual 20-50-12 (Boeing Process Specification 5010, Type
ú 48) (BMS 5-30 adhesive).
ú 2) A single coat of adhesive may be used on either one or both
ú of the surfaces to be bonded.
ú 3) You may apply adhesive bond lines of up to two-inches wide
ú around the duct, but no two bond lines may be closer than
ú 12-inches centerline to centerline.
ú 4) You may bond the insulation to the duct with spot tack
ú bonds.
ú a) Do not use spot tack bonds that are closer than 12
ú linear inches to each other or spot bonds that are
ú larger than 2 inches in diameter.
ú (g) Make sure that the application of adhesive is within the area
ú to be covered by the insulation.
ú
ú S 428-043
ú (9) Install the tape on the edges and seams of the insulation as
ú outlined in the steps that follow:
ú (a) Make sure the tape overlaps all the edges and seams of the
ú insulation by a minimum of 1-inch.
ú (b) Apply tape to within two-inches of each end of the duct outlet
ú or flange and in contact with any spud.
ú (c) Apply an additional circumferential 1-inch wide wrap of tape at
ú the end positions over the previous layer of tape.
ú (d) Apply the tape so that no insulation edge is exposed.
ú (e) Additional circumferentail wraps of one inch wide tape may be
ú applied over insulation and cover as required to secure the
ú insulation to the duct.
ú
ú S 798-034
ú (10) Do this test of the repair:
ú (a) Supply pneumatic power (AMM 36-05-00/201).
ú (b) Set the L PACK switch on the P5-10 panel on the forward
ú overhead panel to ON.
ú (c) Make sure that the repair does not leak.
ú 1) Small leaks are acceptable.
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