Technical data

instruction in Paragraph 2.3 step d of this technical order
and the applicable system specific aircraft or equipment
technical order for the item being blasted such as the
aircraft system specific -23 manual.
2.11.9 Postblast Cleaning. When the finish system has
been completely removed by PMB, thoroughly vacuum all
surfaces of the aircraft, equipment, or component with a
heavy duty, pneumatic type, wet/dry HEPA filtered vacuum
cleaner to remove all finish system dust and media residue.
As an alternative, compressed air or water wash may be used
to remove dust and media residue. However, avoid the use of
compressed air to remove dust and media residue, unless
absolutely necessary. Masking shall be removed, and interior
areas and crevices which were masked or plugged to prevent
dust and media entry shall be inspected for presence of dust
and media particles and vacuumed clean as necessary.
NOTE
PMB media has an anti-static additive that tends
to contaminate the blasted surface and inhibit
paint adhesion. Solvent wiping is required in
addition to washing to completely remove this
residue.
2.11.10 Specific Technical Data and Work Direc-
tives. Prior to initiating any PMB finish system removal
operation on any aircraft, component, or piece of equipment,
each aircraft SPD or equipment item manager (XX-ALC/XX)
shall prepare detailed work specifications or project directives
that outline masking instructions and blasting instructions.
These instructions shall conform to all requirements in this
TO and the applicable system specific aircraft or equipment
TO. Finally, a detailed step by step process order or work
control document that complies with all the technical data and
work specification or project directive requirements shall be
prepared by the maintenance organization or contractor for
each separate PMB finish system removal operation.
2.11.11 Disposal of Plastic Media Used in Paint Re-
moval Operations. Disposal of used media must be
coordinated with the proper local base agency due to the
contamination of the media. The resulting contamination
from most paint removal operations makes the plastic media
a hazardous waste that must be disposed of properly.
2.11.12 Contamination Testing of Plastic Media.
Plastic media shall be tested for contaminates as specified in
the following paragraphs. The media used in PMB equipment
for paint removal of aircraft and aircraft components shall be
sampled and tested every 80 hours of equipment operation
time or after each aircraft or large piece of aerospace
equipment is blasted (whichever is longer). Non-aerospace
equipment such as SE and vehicles are less sensitive to
damage from media contamination, so media used to strip
these items shall be tested for contamination every 800 hours
of equipment operation. Plastic media that is being used to
blast steel/ferrous items for paint removal or other coatings
removal shall not be used on aluminum aircraft surfaces or
components. Media found to have a high-density particle
contamination level greater than that specified in Paragraph
2.11.12.1 shall be purged from the system and replaced with
new media. Testing at the ALCs shall be accomplished in the
physical sciences laboratory (XX-ALC/MAD). Testing at
contractor and field level activities shall be accomplished
locally in a designated area adequately equipped to run the
test for contamination. Organizations using PMB coatings
removal processes in small walk-in or cabinet-type booths are
given an option to either test media as specified in the
paragraphs that follow, or forego PMB testing and purge the
used media and replace it with new media at intervals not to
exceed 80 hours of equipment operation when used on
aircraft components, or 800 hours of operation when used on
non-aerospace equipment. This option is not applicable to
large-scale PMB coatings removal operations where entire
aircraft or large subassemblies, such as wings or horizontal/
vertical stabilizers, are completely stripped.
2.11.12.1 Equipment and Materials Recommended:
One 500 milliliter separatory funnel
Rod stand, for separatory funnel
Holding rings, for funnels
Perfluorohexane, (SG 1.68), 3M Company PN PF-
5060TM or equivalent
ASTM D1836 N-Hexane (Adhesive Thinner), NSN
8040-00-853-8913 for a 1 gallon can (SG 0.66)
One glass funnel, 3 inch nominal diameter
One glass powder (large stem) funnel, 4-inch nomi-
nal diameter
Whatman number 42 (or equal) filter paper, 12.5
cm, to fit above funnel
Scales, 1000 grams capacity, 0.1 gram sensitivity
such as:
Ohaus E4000, 0 - 4000g, 0.1g
Sartorius U3600, 0 - 3600g, 0.1g
Ohaus GT2100, 0 - 2100g, 0.01g
Analytical balance, 100 grams capacity, 0.001 gram
sensitivity such as:
Ohaus E120G, 0 - 120g/0.001g,
Sartorius H120, 0 - 120g/0.001g
Metler AB-160, 0 - 160g/0.0001g
Metler PM200, 0 - 210g/0.001g
Metler AT200, 0 - 205g/0.0001g
Special dual range balances offering bulk weighing
and precision weighing in a single instrument
may be substituted for the above instruments, but
usually they have limited capacity and signifi-
cantly higher prices. Two are:
Metler PM480 DeltaRange, 80g/0.001g, 410g/
0.01g
Melter AT460 DeltaRange, 62g/0.0001g, 405g/
0.001g
500-600 ml tall form Pyrex beaker
TO 1-1-8
Change 3 2-23