D. Prevention Treatment
(1)When the scheduled maintenance work permits, do corrosion prevention
treatment on the horizontal stabilizer.
(2)Apply corrosion inhibiting compound to the aft side of the rear spar,
rear spar cavity, and to the fastener heads and skin joint on the upper
and lower surfaces at the rear spar. Pay particular attention to attach-ment points and faying surfaces.
(3)
Apply BMS 10-79, type 3 primer followed by BMS 10-100 (Aeroflex G12E25)
coating when repair or replacement of the existing corrosion protection
is required (Ref SL 20-6 and 51-7). The BMS 10-100 coating is chemically
compatible with Corogard, but the two coatings have slight differences
in color and finish.
E.
Frequency of Application
(1)Regular inspection is required in areas which can get corrosion, and
should agree with the schedules in the Maintenance Planning Document.
Operators must know of reported problems and areas.
(2)
Regular application of BMS 3-23 compound is necessary in areas identi-fied, and should agree with the schedules in the Maintenance Planning
Document.
F.
Improved Corrosion Protection
(1)On airplane line numbers 1 through 134, a Corogard corrosion preventive
finish was applied on all interspar, upper stabilizer surfaces. But, on
airplanes line number 135 and on, per PRR 53685, these surfaces get BMS
10-79 type 3 primer followed by BMS 10-100 (Aeroflex G12E25) corrosion
protective finish. This change can be included on earlier airplanes with
SL 20-6 and 51-7.
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HORIZONTAL STABILIZER
(2)On airplane line numbers 137 and on, per PRR 52850-10 and PRR 53685, the
upper and lower surfaces of the horizontal stabilizer torque box get BMS
10-100 finish, instead of the Corogard finish used on earlier airplanes.
This change can be included on earlier airplanes with SL 20-6 and 51-7.
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Horizontal Stabilizer
Figure 1
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ELEVATOR
1. General
A. Corrosion-resistant steel (CRES) collars are used with the bolts that attach
the ribs to the spars in graphite-epoxy elevators. But some airplanes
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