MIL-DTL-25427B
height of fuselage of military aircraft). This drop test shall conform, with exception to the height
stated in this specification, to MIL-STD-810, Method 516, procedure IV.
4.8.15.2 Catapult launch and arrested landing. The connected coupling shall be
subjected to a hydraulic static pressure equal to the applicable operating pressure and withstand a
shock test conforming to MIL-STD-810, Method 516, Procedure VIII.
4.8.16 Burst pressure. The connected coupling and the disconnected coupling half shall
be subjected to a burst pressure equal to 250 percent of operating pressure for a minimum of 2
minutes. The rate of applying pressure shall not exceed 25,000 psi per minute. There shall be no
rupture under the specified pressure and leakage shall not exceed twice the values of 4.8.5.2
leakage at high pressure. This test shall be conducted at 275 °F ± 5 °F.
4.8.17 Flange strength. If applicable, the bulkhead half of the coupling (coupling half
mounted on aircraft) shall be mounted by means of its flange to a bulkhead. A union of equal
size of test coupling shall be installed in the boss. A torque equal to 1.5 times the maximum
steel tubing wrench torque conforming to MS21344 (for a given tube size) shall be applied 15
times to the wrench flats of the union without damage to the mounting flange.
4.8.18 Endurance. The couplings shall be subjected to 200 coupling and uncoupling
operations. During each operation, the 15 psi gauge pressure shall be applied to each half of the
coupling. The coupling shall be observed for indication of malfunction and the fluid leakage for
this test shall be measured. The coupling shall withstand this test without malfunction or
excessive wear. The fluid loss shall not exceed the values specified in table III. There shall be no
external leakage.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as
specified in the contract or order (see 6.3). When packaging of the materiel is to be performed by
DoD or in-house contractor personnel, these personnel need to contact the responsible packaging
activity to ascertain packaging requirements. Packaging requirements are maintained by the
Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the
managing Military Department's or Defense Agency's automated packaging files, CD-ROM
products, or by contacting the responsible packaging activity.
5.2 Commercial packaging. Commercial packaging if used shall be in accordance with
ASTM-D3951.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful
but is not mandatory.)
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