MIL-DTL-27516G
4.6.6 Proof pressure testing first article inspection (see 3.5.6). A hose assemblies shall be proof
pressure tested and shall meet the requirements of 3.5.6. The following details shall apply:
a. For first article inspection the depending on the hose assembly being subjected to first article
testing the hose assembly, shall be tested with either two unisex couplings in accordance with
A-A-59377 or with attached couplings in accordance with SAE-AS38404 on one end and to
A-A-59326 on the other end.
b. The hose assembly shall be subjected to the proof pressure in accordance with ASTM D380 to
the pressure specified in table VIII and then tested in accordance to ASTM D380.
4.6.6.1 Proof pressure testing production (see 3.5.6). The hose assembly shall be proof pressure
tested in accordance with ASTM D380 to the pressure specified in table VIII. The hose assembly shall
meet the requirements of 3.5.6.
4.6.7 Length change (see 3.5.7). Length change shall be determined while the hose is subjected to
4.6.8 Burst pressure (see 3.5.8). A hose assembly shall be burst pressure tested and meet the
requirements of 3.5.8. The following details shall apply:
a. A hose assembly, approximately 3 ft in (914 mm) length, shall be tested in accordance with
ASTM D380.
b. Couplings in accordance with SAE-AS38404 shall be used for testing all hose sizes except the
6 inch (152.4 mm) ID hose.
c. When testing the 6-inch (152.4 mm) ID hose, any coupling that will remain on the hose at the
pressure tested may be used.
4.6.9 Crush resistance (see 3.5.9). A length of hose shall be subjected to crush resistant testing and
shall meet the requirements of 3.5.9. The following details shall apply:
a. An unpressurised 12-inch (304.8mm) length of hose shall be centered between 3 inch (76.3
mm) wide parallel metal plates so that only a 3-inch (76.2 mm) length of the hose shall be
crushed.
b. The plates shall be brought together at a rate no greater than 2 in/min (50.8 mm/min) until a
load of 250 pounds (159 kg) has been applied.
c. The distance between the plates shall be measured and expressed as a percentage of the
original outside diameter of the hose.
d. When the load is released, the smallest outside diameter of the hose at the center of the
compressed area shall be measured.
e. The results shall be recorded as a percentage of the original outside diameter of the hose.
4.6.10 Low temperature bend (see 3.5.10). Specimens of the tube and cover shall be low
temperature bend tested and shall meet the requirements of 3.5.10. The following details shall apply:
a. Buffed specimens of the tube and cover, 4.500 inches (114.3 mm) long, shall be clamped in a
concave shape between 2-inch (0.91 mm) wide plates held at 2.500 inches (63.5 mm) apart.
b. No more than .250 inch (0.11 mm) of each end shall be used for clamping.
c. The specimen shall be held in this position and exposed to -42 ± 2°F (-41 ±1.1°C) for 72 hours.
d. After 72 hours and while maintaining the same temperature, the plates shall be moved together
in 5 ± 2 seconds until the ends of the specimens are not more than 1 inch apart.
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