UFC 4-211-01N
25 October 2004
drainage. Intermittent drainage to hangar trench drains should be at 3 m (10 ft)
maximum.
3-11.1.1
Design thresholds to minimize dirt accumulation or ice buildup at
rails. Leaves of the door should be insulated and should be provided with
waterproof weather stripping and emergency personnel exits as required by
NFPA 101, Life Safety Code. The hangar doors should be hand-crank operated
or electric motor operated. For electric motor operation, drives may operate
leaves independently or in groups of three with drives on the end leaves and a
pickup mechanism for the center leaf. The use of a cable system for the pickup
mechanism should not be considered due to the extra maintenance required to
keep the cable system in good operating condition. Each drive unit should have
a release mechanism, and the doors should be provided with a means of
movement in the event of power failure. The normal mode of operation is an
electric drive and the minimum speed of door travel should be 0.3 m/s (60 fpm).
3-11.1.2
Control of the doors should be by momentary contact type push
buttons located near the leading edge of the door and limit switches on each
door leaf. Safety devices should be installed to prevent injury to personnel and
damage to equipment by moving door sections. If personnel access doors are
provided in the hangar door leaves, an interlock should be installed that will
prevent operation of the hangar door leaves when the personnel access doors
are open and will halt the hangar door leaves in the event a personnel access
door is opened while the hangar door leaves are in operation. An alarm should
sound in conjunction with safety warning beacons when doors are in motion.
Sliding steel hangar doors should be in accordance with UFGS 08342N, Steel
Sliding Hangar Doors.
3-11.1.3
Configure hangar doors such that they are operable during power
outages, by either manual or electrical means. See paragraph 7.5.
3-11.2
Vertical Lift Fabric Doors. Hangar doors may be individually
operated, upward acting lightweight frame system with polyvinyl fabric facings.
Design doors in sections with lifting mullions between door sections. Design
features include electric operation, emergency generator outlet, personnel exit
doors, and translucent lighting. Door speed will be a minimum of 3 m/sec
(10 ft/sec) or 60 seconds to open one panel.
3-11.2.1
Design the doors so that in case of a power outage, the doors may
be operated by utilizing Auxiliary Power Units (APU) that are also used for
providing power to the aircraft. The design incorporates a static converter that
converts the 400 Hz power to 60 Hz used in the door motors. Operation
sequences are identified in the Electrical Basis of Design. Additionally, a
generator may be utilized to provide for the operation of the doors.
3-11.2.2
The proposed door arrangement in UFGS 08371N, Vertical Lift
Fabric Doors, permits egress of aircraft through adjacent panel openings in the
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