1) At first opportunity when scheduled maintenance work allows access to the
structure, corrosion prevention treatment should be accomplished.
2) Remove insulation blankets to expose frame, stringer and skin. Dry blankets
thoroughly if found wet.
3) Open plugged drains.
4) Replace broken or damaged finishes. Refer to STANDARD PREVENTIVE
MAINTENANCE PROCEDURES, SUBJECT 51-00-59 for protective finish systems.
5) In all areas, except where indicated, apply a coat of epoxy primer, C00259 primer to
inboard flanges of stringers and allow to dry thoroughly.
6) Allow solvent to evaporate before reinstalling insulation blankets.
7) Reinstall blankets so they are taut and so that the outboard surfaces of the upper
blanket overlap the lower blanket.
(b) Improved Corrosion Protection
1) On airplanes with sealant applied to inboard flanges of stringers, apply a coat of
sealant, A00247, class F, by spray, brush or roller coat to inboard face of stringer
flanges and edges of frames where contacted by the insulation blanket, in areas
above the window belt, between stations 259.5 and 1015. On other airplanes
stringers may have either sealant or an additional coat of Type 1 (yellow) primer,
C00259.
2) Apply corrosion inhibiting compound, G00009 to all exposed structure. Refer to
STANDARD PREVENTIVE MAINTENANCE PROCEDURES, SUBJECT 51-00-59
for methods of application of corrosion inhibiting compound, G00009.
3) On some airplanes operators may wish to rework insulation blankets by removing
the sewn cap strip from the lower edge of the blanket and continuously penetrate
the stitch sealing. The blankets to be reworked must be fabricated with
water-repellent fillers. All 737 airplanes are known to be delivered utilizing
water-repellent fillers.
4) Some airplane have had the tightly sealed covers replaced with unsealed covers to
permit water to enter the blanket and drain. The blankets serve as drain paths into
the lower lobe drain masts. Water repellent blanket filler is used.
5) The sealant, A00247 class F, is applied by spray, brush or roller coating to the inner
flanges of stringers and edges of frames where contacted by the insulation blankets
above the window belt, between stations 259.5 and 1015. Airplane stringers may
have sealant, A00247 or an additional coat of yellow primer, C00259.
SUBTASK 53-11-37-610-012
(5) Frequency of Application
(a) Periodic inspection is required to areas identified susceptible to corrosion and should be
consistent to the schedules identified in the Maintenance Planning Document. Operators
must be aware of reported problems and areas of occurrences.
(b) Periodic application of corrosion inhibiting compound, G00009 compounds is necessary
to areas identified and should be consistent to the schedule specified in the Maintenance
Planning Document.
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-11-37
Page 203
D633A101-ILF Oct 15/2014
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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