SUBTASK 53-11-37-610-057
WARNING
DO NOT APPLY THE CORROSION-INHIBITING COMPOUNDS IN THE AREAS
THAT HAVE OXYGEN SYSTEM COMPONENTS. THE MIXTURE OF
CORROSION-INHIBITING COMPOUNDS, AND OXYGEN CAN CAUSE AN
EXPLOSION. AN EXPLOSION CAN CAUSE INJURIES TO PERSONS, AND
DAMAGE TO EQUIPMENT.
CAUTION
DO NOT INSTALL THE INSULATION BLANKETS THAT ARE SOAKED WITH
CORROSION INHIBITING COMPOUNDS. INSULATION BLANKETS
INADVERTENTLY SPATTERED WITH THE CORROSION INHIBITING
COMPOUNDS SHOULD BE ALLOWED TO DRY BEFORE INSTALLATION.
SOAKED INSULATION BLANKETS ARE POTENTIAL FIRE HAZARDS. THEY
CAN CAUSE DAMAGE TO THE AIRPLANE.
(3) For details of application of water displacing corrosion inhibiting compound, refer to
STANDARD PREVENTIVE MAINTENANCE PROCEDURES, SUBJECT 51-00-59.
SUBTASK 53-11-37-610-058
(4) For minor corrosion detected during the periodic inspections and to minimize the downtime of
the airplane, the corrosion products should be cleaned off, followed by an application of a
corrosion inhibiting compound into the affected area to retard the corrosion process.
SUBTASK 53-11-37-610-059
(5) Prevention Treatment
(a) At first opportunity when schedule maintenance work allows access to the structure,
corrosion prevention treatment should be accomplished.
(b) Remove insulation blankets to expose frame, stringer and skin. Dry blankets thoroughly if
found wet.
(c) Replace broken or damaged finishes. Refer to STANDARD PREVENTIVE
MAINTENANCE PROCEDURES, SUBJECT 51-00-59 for protective finish systems.
(d) Apply a coat of epoxy primer, C00259 to the inboard flange surfaces of stringer and allow
to dry thoroughly.
(e) Apply water displacing corrosion inhibiting compound to all exposed structure. The use of
spray equipment with nozzle directed into faying surfaces is recommended.
(f) Allow solvent to evaporate before reinstalling insulation blankets.
(g) Reinstall blankets so they are taut and so that the outboard surface of the upper blanket
overlaps the lower blanket.
(h) Reinstall liner and restore airplane to normal.
SUBTASK 53-11-37-610-060
(6) Improved Corrosion Protection
(a) A production change replaced the H-11 attach bolts used in the
vertical-fin-aft-spar-terminal support fitting at BS 1088 bulkhead with Inconel 718 bolts.
The Inconel 718 bolt is less susceptible to cracks caused by stress corrosion.
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-11-37
Page 242
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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