provide the conditions necessary for successful com-
conditioning controls must not be relaxed for bonded
posite fabrication. See the shaded area in igure 2-3
repairs on primary structure or critical safety item
for industry standard environmental allowables. Air
Figure 2-3. Temperature and Humidity Allowables for Bonding and Layup
(5) Air Conditioning System. If the air condi-
(8) Dirt traps. The area should be free of
tioning system is inoperable or not able to maintain
ledges, overhangs, protrusions or other dirt traps as
the required temperature and humidity requirements,
much as practical. Walls, ceilings, service plumbing,
repairs to primary structure or critical safety item com-
and furniture should be smoothly inished and painted.
ponents must be terminated until the environment can
Plumbing lines, electrical conduit, and other installa-
tions necessary to service the equipment should be
mounted outside the area or enclosed in order to
minimize dirt traps. Light ixtures should be recessed
(6) Temperature and Humidity Recording
or lush mounted.
Equipment. Temperature and humidity recording
equipment should be located in the area so confor-
(9) Floors. Floors shall be covered with either
mance to environmental requirements can be routinely
shall be sealed with latex, epoxy, or polyurethane or
covered with vinyl tile then sealed and waxed.
capable of maintaining a slight positive pressure (0.05
(10) Central Vacuum. A central vacuum sys-
inch of water) should be provided to prevent dust
and dirt from entering the bonding/layup area.
tem with a HEPA ilter should be included in the
bonding/layup area to facilitate proper housekeeping.
A variety of vacuum accessories should be available,
including an attachment for vacuuming loors.