MIL-DTL-25427B
6.1 Intended use. The self sealing couplings covered by this specification are intended
for use in aircraft hydraulic systems as covered by SAE-AS5440 and are used in installations
where frequent uncoupling of a hydraulic line is required. Couplings covered by this
specification will not be used for ground test stand connections, when separate ground test stand
connections are provided in the aircraft. A coupling provides a convenient means of uncoupling
the line without necessitating drainage of the system and without resulting in any undue leakage
of fluid. Unless otherwise specified by the procuring activity, self sealing couplings should not
be used with any hydraulic fluid other than that conforming to MIL-PRF-5606, MIL-PRF-83282,
and MIL-PRF-87257.
6.2 Military application. This specification contains the requirements of high pressure
couplings designed to operate with unique ground servicing carts to support military aircraft
hydraulic filling systems. These couplings are not used commercially (reported by Industry).
6.3 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification
b.
Part or identification number (PIN)
c.
Material code (see table I)
d.
Pressure classes (see 1.2)
e.
Packaging and packing requirements (see 5.1)
6.4 Qualification. With respect to products requiring qualification, awards will be made
only for products which are, at the time of award of contract, qualified for inclusion in Qualified
Products List QPL-25427 whether or not such products have actually been so listed by that date.
The attention of the contractors is called to these requirements, and manufacturers are urged to
arrange to have the products that they propose to offer to the Federal Government tested for
qualification in order that they may be eligible to be awarded contracts or orders for the products
covered by this specification. Information pertaining to qualification of products may be
obtained from Commander, Naval Air Systems Command, 48110 Shaw Road, Bldg 2187, Code
4.3.5.2, Patuxent River, MD 20670. An online listing of products qualified to this specification
may be found in the Qualified Products Database (QPD) at https://assist.daps.dla.mil.
6.4.1 Retention of qualification. To retain qualification, the contractor must forward a
DD Form 1718 at 2-year intervals to the preparing activity. The preparing activity must establish
the initial reporting date. The DD Form 1718 should include:
a. A summary of the results of the tests performed for inspection of product for delivery,
indicating as a minimum, the number that have passed, the number that have failed, and the lot
which they failed. The results of tests of all reworked lots must be identified and accounted for.
b. A summary of the results of tests performed for periodic inspection, including the
number and mode of failures. The summary must include results of all periodic inspection tests
performed and completed during the 2-year period.
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