Technical data

5.4.3 Cleaning and Maintenance. A suitable coating
should be applied to all dry interior surfaces of a booth to
facilitate cleaning. Paint residue which floats on the surface
of the water should be removed each day to prevent it from
settling to the bottom of the tank. Spray booths should be
coated with an approved fireproof material. The applicable
equipment manual should be consulted for complete infor-
mation on paint spray booths. It is very important to keep the
spray booth and its immediate vicinity as free from dirt and
dust as possible. The strong suction created by the exhaust fan
can pull dust from outside into the booth and may deposit it
on sprayed surfaces.
5.4.4 Part and Equipment Painting Operations. All
parts and equipment painted in spray booths shall be properly
positioned in the booth. This is necessary to ensure the painter
is not improperly exposed during the painting operation. The
parts shall be placed on roll around tables or hung from roll
around racks to allow for their repositioning in the paint
booth during the painting operation. The painter shall spray
into the face of the booth with the air flow from the painters
back. When painting complex parts, change the position of
the part being painted so that the painter is never spraying
into the air flow. Painted parts shall be removed from the
spray booth as soon as possible after the spraying has been
completed and the vapors have been removed. When painting
large equipment, the painter shall begin at the front or exhaust
end of the booth and work toward the back or air supply end.
This is to ensure the painter remains out of the flow of the
paint overspray.
5.5 AIRCRAFT PAINTING OPERATIONS.
5.5.1 Depot Level Aircraft Painting Operations. De-
pot painting of aircraft shall conform to the following safety
and health protection precautions:
NOTE
Painting of entire aircraft will necessarily be
accomplished in a variety of locations including
interior areas not primarily designed for painting
operations and out-of-doors. Insofar as appli-
cable, all safety precautions and directions on
environmental and materials controls pertain in
these areas also. Painting in maintenance hangars
shall be restricted to the minimum necessary to
maintain the integrity of the coating system and
shall always be under cognizance of local safety,
fire and medical service representatives. Painting
in maintenance hangar will be done IAW AFOSH
STD 91-17.
a. Base Fire, Safety, Bioenvironmental, and Environmen-
tal Management Offices shall approve locations for
spray painting aircraft. Painting of fueled aircraft must
be approved by the AFMC and the responsible ALC Fire
Protection Engineering Offices, and is authorized only if
the following precautions are taken. Aircraft containing
JP-5, or JP8 fuel may be electrostatically painted during
depot level operations, providing the on-board fuel
temperature is below the flash point of 100° F before
and during electrostatic painting operations. The aircraft
being electrostatically painted must be grounded in two
locations to prevent accidental electrical discharge from
the electrostatic spray equipment. Each base is respon-
sible for establishing procedures to ensure that the
temperature of on-board fuel is below 100° F before and
during electrostatic painting applications.
b. The ventilation system must provide sufficient exhaust
to remove the solvent vapors generated by the process.
The exhaust stream shall be maintained below 20
percent of the Lower Explosive Limit (LEL) with no
more than 500 ppm total solvent vapor concentration as
defined in OSHA Standard 1910.94. The paint hangar
facility shall be equipped with an audible alarm system
which activates if the ventilation system fails. Personnel
shall wear proper respiratory protection in addition to
the ventilation as specified by Bioenvironmental Engi-
neering.
c. The painting equipment must be used only in the paint
hangar and shall be of the HVLP, Airless or Air-
Assisted-Airless Type and may employ electrostatic
capabilities in accordance with EPA requirements.
d. Painters shall be trained in the hazards associated with
painting fueled and unfueled aircraft, and the fire and
safety problems associated with the process.
e. All safety and regulating features on associated spray
painting equipment and safety equipment shall be op-
erational.
f. No unauthorized personnel are allowed in the paint
hangar during fueled aircraft painting operations.
g. Any personnel involved in operations in the paint
hangar, even those not associated with the painting
process, shall be briefed on the hazards of static on
ungrounded objects and provided with the appropriate
safeguards.
TO 1-1-8
5-4 Change 3