MIL-PRF-62028D
4.3.4 Interface requirements verification. Complete each verification under 4.3.4.
4.3.4.1 Envelope and interface dimensions. Use one or more of the methods outlined in
4.3.1 to verify that the envelope and interface dimensions are IAW applicable drawings (see 6.2).
4.3.4.2 Interchangeability. Use one or more of the methods outlined in 4.3.1 to verify
that interchangeability between different assemblies having the same military part number is
assured.
4.3.5 Support and ownership requirements verification. Unless otherwise specified
(see 6.2), visually verify that the hose is permanently and legibly marked with the following
information:
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".
4.3.6 Operating environment requirements verification. Complete each verification under
4.3.6.
4.3.6.1 High temperature resistance. The hose shall be subjected to an internal flow of air
at the applicable maximum temperature for its class (see 1.2.2). The air flow shall be maintained
for a period of 72 hours with the ambient temperature at room temperature. Subsequent to
testing, evidence of brittle material, cracks, or breaks shall constitute failure of this test.
4.3.6.2 Low temperature resistance. The hose shall be tested IAW ASTM D380 at a
temperature of -65°F. Subsequent to testing, evidence of delamination, cracks, or breaks shall
constitute failure of this test.
4.3.6.3 Vibration resistance. The hose shall be subjected to a constantly-applied
vibration, with a double amplitude of 0.060 in. and a frequency cycled between 10 and 55 Hz in
one-minute cycles. The vibration shall be parallel to the hose axis for 50 hours, and then
perpendicular to the hose axis for another 50 hours. Subsequent to testing, evidence of
delamination, cracks, or breaks shall constitute failure of this test.
4.3.6.4 Fungus resistance. The hose shall be tested IAW ASTM G21. Evidence of
fungal growth shall constitute failure of this test. For first article testing, sample number 6 shall
be tested for 30 days, number 7 for 60 days, and number 8 for 90 days. At the completion of the
8
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business