MIL-HDBK-1028/1C
shake floor hardener as the topping on the floor slab in the
hangar area. Refer to par. 2.3.4.c) & 2.3.4.d) for new
construction and maintenance policy respectively.
3.3.5
Ceilings. Aircraft bays and paint storage, mixing, and
spray areas should have water-resistant gypsum ceilings.
Provide a 1-hour fire-rated ceiling in paint bays. Suspended
acoustical ceilings should be provided for corridors, toilets,
locker rooms, and offices. Suspended acoustical ceiling panels
in shower areas should have vinyl plastic surfaces. The
strip/rinse room ceiling should be of corrosion-resistant,
perforated metal.
3.3.6
Doors and Door Controls. Doors and controls should be
as described in pars. 3.3.6.1 through 3.3.6.3.
3.3.6.1 Hangar Doors. Hangar doors should be a specialized,
insulated, hangar type with swinging leaves. These doors should
serve as an insulated supply air plenum when closed. Provide
perforated plates in the supply air plenum, one stationary and
one adjustable, which allow for balancing to achieve laminar
flow. Use 19 mm (3/4-inch) to 25 mm (1-inch) holes spaced to
give approximately 50 percent free area. Plates are to be 18
gauge galvanized steel. Each door leaf should be a motor-
operated unit with a release mechanism, and the doors should be
provided with a means of movement in the event of a power
failure. Adequate safety devices should be installed to prevent
injury to personnel and damage to equipment due to moving door
sections. Thresholds should be designed to minimize dirt
accumulation and ice buildup.
3.3.6.2 Personnel Doors. Personnel doors between the hangar
area and paint and chemical mixing rooms and the corridor should
be 1-1/2-hour B-rated, self-closing fire doors. Hold-open
devices should not be permitted.
3.3.6.3 Other Doors. Other doors should be as described in par.
2.3.6.5. Provide self-closing, insulated personnel exit doors
from each hangar bay. No hold-open devices should be permitted.
Special precautions should be taken to seal doors between hangar
areas and exterior or adjacent spaces. A vehicle access door
should be provided either within or adjacent to the hangar
aircraft access doors.
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