MIL-PRF-62028D
3.3.4 Flexibility. The hose shall withstand a bending of 180 degrees (°) on four points
spaced 90° apart, around a rigid cylinder with a diameter equal to the ID of the hose, without
permanent kinking, flattening, fracture, or deformation in excess of 2%.
3.3.5 Collapsing resistance. The hose shall withstand a minimum load of 50 pounds (lb),
gradually administered within a time period of 15 seconds maximum. The 50-lb load shall be
applied perpendicular to the axis of the hose for a minimum of 5 minutes, without permanent
setting, distortion, or deformation in excess of 5%.
3.4 Interface requirements. Each hose shall accommodate the interface requirements as
specified in 3.4.1 and 3.4.2.
3.4.1 Envelope and interface dimensions. The overall envelope and interface dimensions
shall be as specified on the interface drawing(s) (see 6.2).
3.4.2 Interchangeability. All hoses shall be interchangeable with parts of other
manufacturers having the same military part number.
3.5 Support and ownership requirement. Unless otherwise specified (see 6.2),
identification marking shall be permanent, legible, and shall include as minimum the following:
a.
Nomenclature "HOSE, AIR DUCT".
b.
Military part number.
c.
Manufacturer's brand or firm name, or CAGE number.
d.
Manufacturer's serial number.
e.
Date of manufacture (month and year).
f.
Contract or order number.
g.
Symbol "US".
3.6 Operating environment requirements. Each hose shall operate under the following
environmental conditions as specified in 3.6.1 through 3.6.5, and with the exception of 3.6.5, shall
subsequently meet the performance requirements of 3.3.1 and 3.3.2.
3.6.1 High temperature resistance. The hose shall not crack, break or become brittle
when subjected to the applicable maximum temperature for its class (see 1.2.2).
3.6.2 Low temperature resistance. The hose shall not crack, break or delaminate when
subjected to temperatures down to -65°F.
3.6.3 Vibration resistance. The hose shall not crack, break or delaminate when subjected
to a constant 0.060-in. double-amplitude vibration, at a frequency cycled between 10 and 55 hertz
(Hz) in one-minute cycles, applied both parallel and perpendicular to the hose axis for a minimum
of 50 hours in each direction.
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