in severe zones, should adjust their frequency of application of
corrosion inhibiting compound.
D. Frequency of Application
(1)Periodic inspection is required to areas identified as susceptible to
corrosion and should be consistent to the schedules specified in the
Maintenance Planning Document. Operators must be aware of reported prob-lems and areas of occurrences.
(2)Periodic application of BMS 3-23 compounds is necessary to areas identi-fied and should be consistent to the schedule specified in the Mainte-nance Planning Document.
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CORROSION PREVENTION MANUAL
FUSELAGE SKIN LAP JOINTS
DETAIL I
Fuselage Skin Lap Joints
Figure 1
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CORROSION PREVENTION MANUAL
GALLERY AND LAVATORY AREA
1. General
A. The areas under galleys and lavatories are susceptible to corrosion because
of spillage of fluids and food. Leakage from plumbing lines also contributes
to corrosion. Seat tracks that are in the galley or lavatory areas are par-ticularly susceptible because of their exposure to traffic debris and spill-age which collect inside the track.
2. Corrosion Prevention
A. Following cleaning of suspected areas, a thorough inspection as described in
Part 1, 20-20-00 is effective to ensure that protective finishes provided
during manufacture remain intact.
B. For minor corrosion, to minimize the downtime of the airplane, the corrosion
products should be cleaned off, followed by the application of a corrosion
inhibiting compound into the affected area to retard the corrosion process
(Ref Part 1, 20-60-00). The finish system should be restored at the first
opportunity consistent with the maintenance schedule.
C. Prevention Treatment
(1)At first opportunity when scheduled maintenance work allows access to
the structure, corrosion prevention treatment should be accomplished.
(2)Preferred access to the structure is from underneath the main deck.
(3)Remove sidewall lining and insulation blankets to expose frames, string-ers, doubters and skin.
(4)Remove floor liners to gain access to bilge areas.
(5)Remove insulation blankets and liners (if any) from bulkheads in the
immediate area below galleys or lavatories.
(6)Remove ceiling lining for access to main deck floor beams and intercos-tals.
(7)Open any plugged drains.
(8)Clear all drain paths.
(9)Replace broken or damaged finishes. Refer to Part 1, 20-60-00 for pro-tective finish systems. Use interior finish system with polyurethane
enamel topcoat.
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