REPAIR COMBINING TRANSMISSION OUTSIDE SURFACE
Protective gloves (E184.1) shall be
worn for the remainder of this task.
Otherwise, personal injury could
Acid etch the reworked area as follows:
Prepare a solution of 3 parts acetic acid
(E21) in 7 parts water. Wear gloves (E184.1)
Swab area with solution for 2 minutes. Use
gauze sponges (E184).
Rinse the area with cold water.
Fluorescent inspect reworked area to check
for cracks (TM 1-1500-335-23). There shall
be no cracks. If a crack is suspected in the
combining transmission outside surface, refer
to TM 1-1520-253-23.
Apply surface treatment to reworked area as
Clean the area with naphtha (E245) and
clean cloths. Let the area air dry.
Swab on solution of chromic acid (E114) and
calcium sulphate (E91). Swab until metal
becomes dull gold to brown. Use gauze
sponges (E184). Rinse the area with cold
water and let air dry.
Priming and painting shall be done
Apply one coat of epoxy primer (E292 or E293)
to the reworked area. Let air dry for 2 hours.
Finish the reworked area with two coats of black
lacquer (E462) or polyurethane (E285.1) as
determined by the following:
Apply methyl-ethyl-ketone (MEK) (E244) to
a small area of the existing topcoat near the
area to be finished. Use brush (E86).
Wipe the area. If the topcoat wipes away, use
lacquer (E462). If the topcoat is unaffected,
use polyurethane (E285.1).
END OF TASK