(a) At first opportunity when scheduled maintenance work allows access to the structure,
corrosion prevention treatment should be accomplished.
NOTE: Preferred access to the floor structure is from the lower lobe.
(b) Remove sidewall lining and insulation blankets to expose frames, stringers, doublers and
skin.
(c) Remove floor panels to gain access to bilge areas.
(d) Remove insulation blankets and liners (if any) from bulkheads in the immediate area
below galleys or lavatories.
(e) Remove ceiling lining for access to main deck floor beams and intercostals.
(f) Open plugged drains, if any.
(g) Clear all drain paths.
(h) Refinish broken or damaged finishes. Refer to STANDARD PREVENTIVE
MAINTENANCE PROCEDURES, SUBJECT 51-00-59for protective finish systems. Use
interior finish system with polyurethane enamel topcoat.
(i) Replace or repair broken or damaged leveling compounds used for drainage.
(j) Apply sealant, A00247, class F, chromate-loaded sealant to the inboard flanges and to
portions of the frames that come in contact with insulation blankets. Allow to cure for 48
hours. Note condition of the sealant and reapply as necessary.
(k) Apply corrosion inhibiting compound, G00009 water displacing corrosion inhibiting
compound to all structures under galleys and lavatories. Exposed structure of bulkheads
should also be included. Special efforts should be made to apply the corrosion inhibitor to
the top of the floor support structure where moisture may be trapped between the floor
panel and floor support. The use of spray equipment with nozzle directed into faying
surfaces is recommended. Do not apply excessively.
NOTE: To reduce the possibility of moisture entrapment between insulation blankets and
airplane skins in the bilge area, supports for the insulation blankets were
provided. These supports consist of nylon twine and brackets. Silicone rubber
used on earlier installations may deteriorate due to exposure to hydrocarbons
present in corrosion inhibiting compound and should be replaced with nylon
twine.
(l) Allow solvent in the corrosion inhibitor to evaporate before reinstalling insulation blankets.
(m) Install blankets so they are taut and so that the outboard surfaces of lower blanket
overlap the lower blanket.
(n) Install liners and floor panels. Install the floor panel fasteners with grease, D00633.
SUBTASK 53-11-37-610-026
(7) Frequency of Application
(a) It is recommended that corrosion inhibiting compound, G00009 water displacing
corrosion inhibiting compound be applied to the lower lobe structure whenever the area is
made accessible, at intervals not to exceed the "D" check.
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-11-37
Page 216
D633A101-ILF Oct 15/2018
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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