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 I, 20-60-00). The finish system should be restored at the first
opportunity consistent with the maintenance schedule.

C. Prevention Treatment

(1) Internal Treatment:

(a)
The treatment of internal surfaces described above should be made at
the first opportunity splice area is exposed. Location of the area
should be noted and monitored from the outside every 3 months for
visual indication of corrosion progression.

(b)
Apply  water displacing corrosion inhibiting compound into lap
joints, rivet heads, and/or heel of stringers as noted in the meth-ods described below.

1) Insulation blankets should be protected or removed from the imme-diate treatment area to prevent spattering of the blankets. Insu-lation inadvertently spattered should be allowed to dry before
installation.

2) Loose sealants should be removed but not replaced. Broken sealants
should not be replaced.

3) Apply water displacing corrosion inhibiting compound into lap
joint edges, rivet heads and heel of the stringer. The use of pres-sure spray equipment with nozzle directed into joint is recom-mended.

(c)
Do not apply corrosion inhibiting compounds on interior materials
such as cargo liners. The compounds change the flammable quality of
these materials.

(d)
Do not apply corrosion inhibiting compounds on insulation blankets.
The compounds reduce the water-repellent quality of the blankets.

Volume 2-757

53-90-01

Page 1
OCT 01/00

CORROSIONPREVENTIONMANUAL
FUSELAGE SKIN LAP JOINTS

(2)External Treatment:

(a)
For corrosion prevention, apply BMS 3-23 into lap joints and on lap
joint rivet heads. On fillet sealed splices apply BMS 3-23 along the
edge of panel and on lap joint rivet heads. Broken seals should not
be replaced. BMS 3-23 should be left on for 30 minutes and the excess
removed with a dry rag. The use of pressure spray equipment with noz-zle directed into joint is recommended.

(b)  
Operators who wash frequently with detergent and those who operate
　
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