(b)
Sand the damaged area to remove any remaining adhesive and contamination.
(c)
Use the solvent and a wiping cloth to clean the damaged area.
S 342-167
(7) Prepare a piece of polyurethane foam duct that matches the damaged duct and is the correct length to replace the damaged section of the duct.
NOTE: Cut the replacement section with clearance for the material
____ that will be added by the duct end repair procedure.
S 342-168
(8)
Do the Duct End Repair - Polyurethane Foam Duct procedure above for each end of the replacement duct section and for each end of the damaged duct.
S 342-169
(9)
Cut two pieces of the fiberglass cloth 3 inches wide and long enough to wind around the duct a minimum of four times.
S 342-173
(10)
Prepare the resin.
E. Repair the Taped Joint
S 342-174
(1)
Apply resin to the duct ends. Let the resin partially dry until it is sticky. Press the duct ends together by aligning the installation checkmarks.
S 342-175
(2)
Apply the applicable resin to the joint area a minimum of 2 inches on both sides of the joint.
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A
737-300/400/500MAINTENANCE MANUAL
S 342-176
(3)
Apply the applicable resin to one side of the two pieces of the fiberglass cloth.
S 342-177
(4)
Wind one piece of the fiberglass cloth around each duct joint a minimum of four times.
NOTE: Make sure the resin on the fiberglass cloth is in contact
____
with the duct.
S 342-178
(5)
Put a piece of plastic sheet on the joint and press it lightly with a squeegee or with your hand. Make the fiberglass cloth smooth from the center to the edges of the cloth to remove any bubbles or any wrinkles and to remove unwanted resin.
S 342-179
(6)
Let the resin cure for 24 hours at room temperature.
S 342-180
WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM THE SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
(7) Clean any unwanted resin from the joint areas with a wiping cloth and solvent.
F. Put the Airplane Back to Its Usual Condition
S 412-181
(1)
If insulation was removed from the duct, install new insulation.
S 412-182
(2)
Replace the panels or other airplane structure removed to gain access to the duct joint.
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A 737-300/400/500MAINTENANCE MANUAL
90` AIR OUTLET TAPE PATTERN 45` AIR OUTLET TAPE PATTERN
FOR INSULATION DAMAGE APPLY A MINIMUM 2-INCH X 2-INCH PATCH OF PRESSURE SENSITIVE ADHESIVE TAPE TO THE DAMAGED AREA. MAKE SURE YOU HAVE FULL COVERAGE OF THE DAMAGED OR TORN AREA WITH NO LESS THAN 1/2-INCH OVERLAP.
Air Conditioning System Insulated Duct Repair (Polyimide Foam)
Figure 203
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. DUCTS WITH POLYIMIDE FOAM INSULATION ú 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 空调 AIR CONDITIONING 1(59)
