6600/Rev/Mar.2021
Page 26
Altronic Research Inc.
5.
Specific procedures
A. Preservation of the finish.
This equipment is finished with a durable semi-gloss enamel paint system applied over a pretreated
surface. The finish is very durable and needs only regular washing to maintain its appearance and
corrosion protection properties. There is no advantage to using strong detergents on the finish. We
recommend that products suitable for washing an automobile be used at the dilution recommended by
the manufacturer.
In the event that the finish of the load has been mechanically damaged, it will be necessary to prepare
the surface and recoat it. We recommend that this procedure be undertaken by a person who has dealt
with corrosion on aircraft surfaces.
a.
Clean the surface to be repaired. Use fresh water and mild detergent to remove all traces of sand,
salt or oil.
b.
Lightly sand the damaged area with 360 grit wet or dry silicon carbide paper. Use care to feather
all edges of broken paint. Never use steel wool, a steel brush, jeweler’s rouge or emery abrasives
for this step.
c.
Some areas may have progressed to a stage where pitting is evident. Pits should be treated
with a phosphoric acid base corrosion removing compound and thoroughly cleaned prior to
conversion coating and painting. Use MIL-C-10578D Compound, Corrosion Removing and Metal
Conditioning, Type IV in accordance with the included instructions. Available from Altronic
Research, Inc. [Part Nr. 000-77000-CCR].
d.
Clean the surface again.
e.
Use Gardobond EPP pretreatment (formerly called Permatreat EPP) available from the factory or
www.ChemetallOakite.com
to prepare the surface of the metal for new paint. Ensure that the
directions are followed and that excess product solution is properly disposed of.
f.
Allow the conversion coating to air dry, then wipe the surface with a clean cotton towel.
g.
The surface is now ready to be painted, if that is required. For areas less than 12 square inches
[about 80 square centimeters], it is best to brush the paint on the surface. Use a single coat and
allow it to air dry for ~2 hours before handling. In cold or damp conditions, the paint may require
much longer to dry fully. We do not recommend application of paint or conversion coating when
the temperature of the surface is less than 50
°
F [15
°
C].
h.
Paint which matches the finish and color of the load is available from the factory. Order Paint,
Modular Ivory, Touchup [Part Nr. 000-77000-PNT].
B.
Prevention of dissimilar metals corrosion
This is a matter that was addressed in the design of the load to the extent possible. There are areas
where dissimilar metals are necessarily in close proximity, if not in contact. These areas need more
frequent attention, including regular washings and treatment with a moisture-displacing corrosion
preventive compound. These areas are: the resistor clip/resistor interface, the resistor clip/mounting
strip interface, the RF conductor/load face panel interface and the RF conductor/RF connector center
conductor interface.
a.
Make unit safe for servicing in accordance with paragraph 4 above.
b.
Remove the roof and top panel from the load and stow them safely.
c.
Wash entire unit inside with potable water. Pay particular attention to the resistor strips.
d.
Allow the inside of the unit to completely dry.
e.
Spray the resistor ends, the resistor clips and the RF conductor attachments with “Boeshield T-
9
®
”.
