TASK 53-11-37-600-806
6. Nose Gear Wheel Well - Corrosion Prevention
Figure 205
A. General
(1) The nose gear wheel well is a rigid box structure consisting of a ceiling, two sidewalls, a
forward and an aft wall and is located in the forward fuselage. The nose gear attachment
fittings are located in the wheel well.
(2) The surfaces inside the box structure are exposed to air contaminants and runway splash and
are subject to corrosion. The nose gear attachment fittings are also found to be susceptible to
corrosion.
(3) Stress corrosion cracking of the aluminum alloy actuator support fitting has been reported.
Cracks occurred in the vertical leg midway between the rows of fastener holes. In another
instance cracking and failure of the bearing retaining lug was reported.
(4) Corrosion has been reported on the exterior surfaces of the box, on webs, stiffeners and
chords. Cracking of the upper panel web BS 277 stiffener has also been reported.
(5) Stress corrosion cracks have been reported on the LH and RH lock support fitting to which the
strap is riveted. One of the cracks was between the two attach rivet holes and the other
extended into the upper flange radius. It was determined that the strap induced clamp-up
stresses in the fitting during strap installation. The strap was removed as a crack preventive
measure.
(6) Refer to CORROSION PREVENTION, SECTION 51-00 of this manual 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
C00755 Compound - Organic Corrosion Inhibiting,
Heavy Duty
BMS3-26
G00009 Compound - Organic Corrosion Inhibiting BMS3-23
D. Location Zones
Zone Area
115 Nose Landing Gear Wheel Well - Left
116 Nose Landing Gear Wheel Well - Right
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-11-37
Page 228
D633A101-ILF Oct 15/2014
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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