B. The aft face of the bulkhead is susceptible to corrosion due to moisture and
contamination. The web lap splices and fastener heads leave unsupported
areas of the paint system, which leads to cracking of the paint or flaking
which are starting points for corrosion.
2. Corrosion Prevention
A. Following cleaning of suspected areas, a thorough inspection as described in
Volume 1, 20-20-00 is effective to ensure that protective finishes provided
during manufacture remain intact. Refer to Volume 1, 20-60-00 for details on
the application of corrosion inhibiting compound.
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 Volume 1, 20-60-00). The finish system should be restored at the first
opportunity consistent with the maintenance schedule.
C. Frequency of Application
(1)Periodic inspection is required in 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 compound is necessary to areas identi-fied and should be consistent to the schedule specified in the Mainte-nance Planning Document.
D.
Improved Corrosion Protection
(1)On airplanes line number 328 and on, PRR 54313 added BMS 3-26 corrosion
preventive compound on top of the BMS 3-23 compound on all forward sur-faces of the aft pressure bulkhead below the floor.
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Aft Pressure Bulkhead
Figure 1
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CORROSION PREVENTIONMANUAL
FUSELAGE -SECTION 46
NOTE:For coverage of galley and lavatories formerly covered here, refer to
53-95-01.
1. General
A. Section 48 extends from stations 1720 to 2005.2. This is the aft, unpressur-
ized section of the fuselage. Section 48 includes the APU compartment, aft
of the firewall at stations 1885 and 1896. The horizontal and vertical sta-bilizers attach to Section 48.
B. The corrosion protection for the interior aluminum between stations 1720 and
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