(4)
Wiping cloth, lint free - commercially available
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-23-01
ALL ú ú 01.1 Page 230 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE 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
21-23-01
ú ú 01 Page 231 ú May 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
L22485
A
757
MAINTENANCE MANUAL
C. References
(1)
AMM 36-00-00/201, Pneumatic - General
D.
Prepare for the Repair
S 862-278
(1) Release the pressure from the pneumatic system (AMM 36-00-00/201).
NOTE: This will make sure that there is no airflow in the ducts
____
when you do the repair.
S 862-279
(2)
On the bleed air control module on the pilots' overhead panel, P5, put the pack control switches in the OFF position.
S 012-280
(3)
Remove the applicable ceiling, sidewall, or floor panels to gain access to the damaged air conditioning duct joint.
S 012-318
(4)
Remove the duct if needed for better access.
S 012-319
(5)
Remove all loose or old tape from the insulation.
S 162-255
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.
(6)
Use the solvent and a wiping cloth to clean the surface of the insulation where new adhesive tape will be installed.
E.
Replace the Tape
S 412-320
(1)
Install new adhesive tape (BMS 5-149) to the insulation as shown in Figure 203.
(a)
Make sure the adhesive tape overlaps all the edges and seams of the insulation by a minimum of 1-inch.
F.
Put the Airplane Back to Its Usual Condition
(1)
Reinstall the duct (if removed).
S 412-282
(2)
Replace the panels or other airplane structure removed to gain access to the duct joint.
S 412-281
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-23-01
ALL ú ú 01 Page 232 ú May 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
TASK 21-23-01-212-283
12. Insulation Repair - Duct with Polyimide Foam Insulation (Fig. 203)
_______________________________________________________
A. General
(1)
This procedure gives instructions to repair cuts or tears in the insulation on air conditioning ducts with Polyimide foam insulation (BMS 8-300).
B.
Consumable Materials ú (1) Tape - Pressure sensitive adhesive (BMS5-149, Type XI, Class 1, ú Grade C) (AMM 20-30-07/201) ú ú NOTE:____Do not use the BMS 5-149 tape made by the Orcon Corporation ú with the BMS 8-300 polyimide foam insulation material. Only ú the BMS 5-149 tape made by E&H Laminating & Slitting Company ú is compatible with the BMS 8-300 polyimide foam insulation ú material. ú
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