TASK 53-11-37-600-808
7. Door Openings - Corrosion Prevention
Figure 206
A. General
(1) The door openings and surrounding structure in the fuselage section are made up of frames,
doublers, fittings, stiffeners and intercostals. In addition, the passenger and/or crew entry doors
have reveals and scuff plates.
(2) The primary corrosion area is under the door sill, floor panels and floor beams. Contaminants
are tracked in by passenger, crew members, cargo and service personnel or by driven
rain/snow when door is opened. Specific problems have been reported under the corrosion
resistant steel plates at the cargo doors.
(3) Insulation blankets are provided on cabin interiors for passenger comfort and to minimize the
condensation of warm cabin air on cold skins and stringers. Corrosion has been experienced in
areas where the blankets are not installed taut and wrap around stringers or lay on the skins.
Reports of water soaked blankets have been common in these instances.
(4) Stress corrosion can cause cracks in the frame at Station 360.
(5) Some skins and doublers came apart, pulled through the rivets, and tore the skin at the aft
edge of the cutout for the aft cargo door. The damage was caused by the water from the main
landing gear tires when the runway was wet.
(6) Refer to the CORROSION PREVENTION, SECTION 51-00 for a discussion of the Aging
Airplane Corrosion Prevention and Control Program and related documentation. Structural
items within this section are subject to the unique requirements of the mandatory Corrosion
Prevention and Control Program.
B. References
Reference Title
51-00 CORROSION PREVENTION
51-00-51 INSPECTION AND DETECTION
51-00-59 STANDARD PREVENTIVE MAINTENANCE PROCEDURES
C. Consumable Materials
Reference Description Specification
A00247 Sealant - Pressure And Environmental -
Chromate Type
BMS5-95
C00259 Coating - Chemical And Solvent Resistant
Finish, Corrosion Inhibiting Primer
BMS10-11 Type I
D00633 Grease - Aircraft General Purpose BMS3-33
G00009 Compound - Organic Corrosion Inhibiting BMS3-23
D. Location Zones
Zone Area
821 Forward Cargo Door
822 Aft Cargo Door
830 Subzone - Passenger Compartment Doors, Left
835 Main Deck Cargo Door
840 Subzone - Passenger Compartment Doors, Right
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-11-37
Page 234
D633A101-ILF Oct 15/2015
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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