21-23-02
ALL ú ú 03A Page 816 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 348-103
(8)
Remove the plastic sheet from the cloth and remove unwanted resin with a wiping cloth.
S 348-105
(9)
Let the resin cure for 24 hours at room temperature.
F. Put the Airplane Back to Its Usual Condition
S 428-106
(1)
If insulation was removed from the duct joint, install new insulation.
S 418-107
(2)
Install the panels or other airplane structure removed to gain access to the duct joint.
TASK 21-23-02-308-108
6. Rigid Foam Duct - Duct End Repair (Fig. 802)_________________________________
A. General
(1)
This procedure gives instructions for the repair of the end of a rigid foam air conditioning duct. This procedure is done if the lining that covers the rigid foam at the duct end is damaged and the rigid foam is exposed.
(2)
This procedure may be required when doing the repair of a taped duct joint.
B. Consumable Materials
(1)
Fiberglass cloth - minimum 0.007 inch thick (MIL-C-9084 Type VIII) -commercially available
(2)
Plastic sheet - polyethylene or vinyl (commercially available)
(3)
Resin - BMS 8-201 Type II (Epocast 50-A)
(4)
Solvent - Butyl carbitol (alternative to B01011, Series 91) -commercially available (AMM 20-30-91/201)
(5)
Solvent - B01011, Series 91 - commercially avilable
(AMM 20-30-91/201)
(6)
Squeegee - commercially available
(7)
Wiping cloth, lint-free (commercially available)
C. References
(1) AMM 36-00-00/201, Pneumatics - General
D. Prepare for the Repair
S 868-109
(1) Remove the pneumatic power (AMM 36-00-00/201)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-23-02
ALL ú ú 01A Page 817 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
(2) S 868-110On the bleed air control module on the pilots' overhead panel, put the pack control switches in the OFF position.
(3) S 018-111Remove the applicable ceiling, sidewall, or floor panels to gain access to the damaged air conditioning duct joint.
(4) S 028-112If insulation is installed on the duct joints, remove the insulation.
(5) S 348-113Do these steps to prepare the damaged area of the duct:
WARNING:_______ DO NOT GET SOLVENTS IN YOUR MOUTH, OR IN YOUR EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIROMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
(a) Use the solvent and a wiping cloth to clean the damaged area.
NOTE:____ Clean the duct end area and the inside and outside of the duct a minimum of 1 inch from the duct end.
(b) (c) Sand the damaged area to remove any remaining adhesive and contamination.Use the solvent and a wiping cloth to clean the damaged area.
(6) S 348-114Prepare the Fiberglass cloth: (a) Cut a piece of fiberglass cloth the length of the outside circumference of the duct.
NOTE:____ The cloth should have the width needed to overlap the duct end and the inside and outside of the duct a minimum of 1/2-inch.
(7) S 348-115Prepare the resin.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 空调 AIR CONDITIONING 1(37)
