S 416-009

 (9)
Close the fan cowl panels (AMM 71-11-04/201).

 S 416-010

 (10)
 Close the air conditioning access panels.

 S 416-011

 (11)
 Close the leading edge slats access panels (AMM 12-31-61/201).

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737-300/400/500MAINTENANCE MANUAL
 PNEUMATIC DUCT - CLEANING/PAINTING
__________________________________
 1.  General_______
 A.  The titanium ducts can corrode and become brittle if touched with fire-resistant hydraulic fluid at temperatures more than 270°F. On ducts that are painted or not painted, the change is shown as follows:
 (1)  
A bright glossy brown layer.

 (2)  
A matt black residue.

 (3)  
A bare surface on painted ducts.

 B.  You can clean the ducts to remove the contamination. You can remove the ducts to clean them or they can stay installed when you clean them. If they are installed when you clean them, you must be careful that the solution used does not touch other components.
 TASK 36-19-15-107-001
 2.  Duct Cleaning_____________
 A.  References
 (1)  
SOPM 20-30-03, Standard Overhaul Practices Manual, General Cleaning Procedures

 (2)  
SOPM 20-41-01, Standard Overhaul Practices Manual, Decoding Table for Boeing Finish Codes

 (3)  
SOPM 20-44-01, Standard Overhaul Practices Manual, Application of Special Purpose Coating and Finishes

 B.  Clean the Ducts
 S 117-003
 (1)  
If the ducts are touched with the fire-resistant hydraulic fluid, clean the ducts (SOPM 20-30-03, Section 8, Manual Cleaning).

 S 117-004

 (2)  
Titanium ducts that require the removal of hydraulic fluid contamination while installed on the airplane may be cleaned as follows:

 (a)  Clean the duct with the use solvents such as cold alkaline, solvent emulsion, and foam cleaners (SOPM 20-30-03, Section 8, Manual Cleaning).
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737-300/400/500MAINTENANCE MANUAL
 (b)  Soak ducts with thick hydraulic fluid residues with alkaline solvent for 20 to 40 minutes, then scrape it off the duct with a soft piece of wood (tongue depressor).
 NOTE: Do not remove hydraulic fluid residues on titanium
____ ducts with power wire brush or abrasive air blast materials. Aluminized steel wool or scotch brite pads may be used. The ducts may be stained as many times as you want after it has been cleaned and provided that all the hydraulic fluid residues has been removed and the surface of the duct is smooth.
 S 377-004
 (3)  After you clean the ducts, you can paint them with BMS 10-82 low emissitivity gold coating (SOPM 20-44-01) or B-2000 high temperature coating (SOPM 20-41-01, SRF-14.87) to provide a protective coating for the duct.
 NOTE: B-2000 high temperature coating may be applied over worn
____ or scarred BMS 10-82 gold coating or to bare titanium ducting.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 PNEUMATIC DUCT - APPROVED REPAIRS
_________________________________
 1.  General
_______
 A.  Ducts with thin walls can be damaged as follows:
 (1)  
The incorrect removal or installation of the duct.

 (2)  
　
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