Technical data

NOTE
It is essential that a formal maintenance/repair
schedule be instituted for the high efficiency
vacuum units. Replace bags in vacuum units after
each aircraft or large part has been sanded. Do
not use vacuums when the hoses have holes or
tears. Use the minimum length of hose attached
to vacuum units to ensure the highest airflow
rates through the vacuum. Use the vacuum at the
manufacture’s recommended compressed air
pressure.
3.1.3.3.2 After the finish system has been sanded, use
HEPA vacuums with appropriate attachments to vacuum dust
from aircraft and facility floors. Do not use compressed air
unless absolutely necessary to remove dust from very narrow
cracks and crevices.
3.1.3.3.3 Complete all remaining operations for prepara-
tion of the aircraft for painting as required in Chapter 4 of this
manual.
3.1.4 Solvent Wiping For Surface Preparation. Sol-
vent wiping may be used for general cleaning prior to surface
preparation or for final cleaning prior to coating application.
A clean surface is one of the most critical process require-
ments that must be met to ensure coating adhesion. Depend-
ing on the process requirement, solvent selection should be
made from the approved solvents in Table 3-2. The necessity
for having an exceptionally clean surface to receive the new
paint system requires that a solvent wipe be done: 1) if the
surface becomes contaminated after chemical treatment, 2)
after all scuff sanding operations, and 3) if required for
reactivation of coating. Given these requirements, a hand
solvent wipe shall be performed each time the coating
sequence of an aircraft is broken and the surface has been
vulnerable to the accumulation of soils such as dust, shop dirt,
fingerprints, overspray, leaks, etc., either after conversion
coating application, priming, or between topcoats. This will
be accomplished immediately prior to application of further
paint coats to assure cleanliness and the adhesion of the paint
film to the surface. The hand solvent wipe-down shall be
accomplished using materials per Table 3-2. The solvent will
be applied and the surface wiped using wiping cloths. Wiping
cloth (CID A-A-59323) shall be lint free, 100 percent cotton
cloth conforming to A-A-2522, Grade A, color 1: cotton
gauze/cheese cloth conforming to CCC-C-440, Type II or III,
which are unbleached or white cleaning cloths conforming to
AMS 3819A, Class 2, Grade A, and have not been exposed to
any other chemical solution. When accomplishing the solvent
wipe, always pour fresh solvent onto the cloth and dispose of
them as they accumulate soils. The solvent wipe must be
performed in this manner in order to prevent simply smearing
soils or transferring them back to the surface from a pail of
contaminated solvent. This operation must be accomplished
when required and always just prior to application of the
primer or subsequent paint topcoats.
TO 1-1-8
3-3