MIL-DTL-24788A
3.5.1 Strainer. The strainer in a clogged condition shall withstand 15 pounds per square inch (PSI) differential
pressure in the fueling direction without collapse, tearing, or other damage to the screen.
3.6 Screw threads. Screw threads shall be in accordance with FED-STD-H28 or ISO 68.
3.6.1 Screw-thread locking devices. Threaded fasteners that, if loosened or disengaged, could fall into the fuel
system, shall be locked by self-locking nuts, thread locking inserts, lock wires, or cotter pins.
3.7 Synthetic rubber parts.
3.7.1 Elastomeric compatibility. O-rings, seals, and other elastomeric parts shall be compatible with aviation
fuels as specified in 3.3.2.
3.7.2 Elastomeric serviceability. Elastomeric parts shall be readily replaceable with a minimum teardown of
attaching parts.
3.8 Interchangeability. Parts having the same manufacturer's part number shall be directly and completely
interchangeable with each other with respect to installation and performance. Regardless of manufacturer, all male
halves (nipple), per Figure 1, shall be completely interchangeable in terms of installation and performance when
used with all female halves.
3.9 Identification of product. Assemblies and parts shall be marked for identification in accordance with MIL-
STD-130.
3.9.1 Identification. The female half of the semi-dry-break, quick-disconnect coupling assembly shall be
identified in accordance with MIL-STD-130. The information shall contain the following:
a.
Manufacturer's name or logo
b.
The number of this specification
c.
Contract or order number
d.
Manufacturer's part number
e.
Manufacturer's serial number
f.
Date of manufacture
3.10 Performance requirements.
3.10.1 Proof pressure. When tested as specified in 4.5.1, there shall be no evidence of leakage, distortion, or
failure of any part or component.
3.10.2 Operating force. When tested as specified in 4.5.2, the force to engage the male and female halves of
the semi-dry-break, quick-disconnect coupling assembly shall not exceed 60 pounds and the force to disengage shall
not exceed 20 pounds.
3.10.3 Leakage. When tested as specified in 4.5.3, there shall be no evidence of leakage from the semi-dry-
break, quick-disconnect coupling assembly under positive pressure. When under negative pressure leakage of air
into the semi-dry-break, quick-disconnect coupling assembly shall not be greater than 50 cubic centimeters (cc) per
minute.
3.10.3.1 Semi-dry-break leakage. When tested as specified in 4.5.3.1, there shall be no leakage through the
female half of the semi-dry-break, quick-disconnect coupling assembly.
3.10.4 Extreme temperature. When tested as specified in 4.5.4, there shall be no signs of leakage, cracking, or
other evidence of failure to the semi-dry-break, quick-disconnect coupling assembly.
3.10.5 Total pressure loss. When tested as specified in 4.5.5, the pressure drop across the entire semi-dry-
break, quick-disconnect coupling assembly shall not be greater than 12 PSI at 300 gallons per minute (gal/min).
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