UFC 4-211-01N
25 October 2004
Including change 1, 1 October 2006
and flat sheet construction of unprotected (uncoated) aluminum and to ribbed
aluminum extrusions. Consideration should also be given to the corrosion of
aluminum surfaces on the interior of structures due to salt deposits from salt-
laden air.
3-22.7.4
Incompatible Materials. Surfaces of incompatible metals; wet,
green, or damp wood; wood treated with incompatible preservatives; masonry;
and concrete should be isolated from direct contact with the aluminum by a
heavy coat of alkali-resistant paint or by other approved means
3-22.7.5
Coated Metal.
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\ Coated metal roofing should be in accordance
with UFGS-07 41 13, Non-Structural Metal Roofing. Coated siding should be in
accordance with UFGS 07 42 13, Metal Wall Panels. /1/
3-23
WEIGHT-HANDLING EQUIPMENT. The maintenance hangar
(OH) space should contain overhead bridge cranes and jib cranes in accordance
with MIL-HDBK-1038, Weight Handling Equipment and contain a bridge crane in
the OH space of each maintenance hangar module supporting helicopters,
propeller driven aircraft or the C-9, V-22 or AV-8 aircraft (see Aircraft
3-23.1
Bridge Cranes. Overhead bridge cranes should have electric
motorized bridge, trolley and hoist. One 5000 kg (5 ton) capacity crane should
be used per hangar module, with the bridge designed to travel the full width of
the module. The bridge should span 12 m (40 ft), with the centerline of the
bridge located 9 m (30 ft) from the rear bulkhead. Trolley and bridge should be
capable of operating at a slow speed of 0.07 to 0.1 m/s (15 to 20 ft/min) for
positioning loads and at a high speed for moving loads of 0.3 m/s (60 ft/min); the
hoist should be capable of operating at a slow speed of 0.01 to 0.02 m/s (3 to 4
ft/min) and at a high speed of 0.06 m/s (12 ft/min). Refer to
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\ UFGS 41 22
13.14 20, Cranes, Overhead Electric, Underrunning (Under 20,000 Pounds). /1/
3-23.1.1
Motor and Controls. Bridge, trolley and hoist controls should
provide for two-speed reversing of a two-speed, squirrel-cage motor. The
controls should be equipped with reduced voltage starting for the motors.
Controls should be operable from the floor.
3-23.1.2
Hook Height. The hook height for bridge cranes should be as
required to lift engines and transmissions clear of aircraft. Minimum hook
clearance height (measured from the hangar floor to the hook at full retraction)
for hangars housing H-53E aircraft should be 8.2 meters (27 ft). All others
should have a minimum ceiling height of 7.6 m (25 ft) for Type I and 11.6 m (38
ft) for Type II.
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