MIL-DTL-25427B
TABLE VI. Conformance inspections.
Inspection
Test paragraphs
Requirement paragraphs
Examination
4.8.1
3.6, 3.8, and 3.9
Manual operation
4.8.2
3.7.2
Leakage
4.8.5
3.7.5
Proof pressure
4.8.10
3.7.10
TABLE VII. Periodic inspections.
Inspection
Requirement paragraphs
Test paragraphs
Manual operation
3.7.2
4.8.2
Leakage
3.7.5
4.8.5
Proof pressure
3.7.10
4.8.10
Burst pressure
3.7.16
4.8.16
4.7 Inspection of packaging. Except when commercial packaging is specified, the
sampling and inspection of the preservation and interior package marking shall be as specified in
a contract. Unless otherwise specified, the sampling and inspection of packing and marking for
shipment and storage shall be in accordance with the requirements of MIL-STD-129.
4.8 Methods of inspection.
4.8.1 Examination of product. The coupling shall be visually inspected for verification
of good workmanship and correct markings. Physical measurements shall be taken and a record
of all dimensions noted on applicable assembly drawings for verification of correct
configuration, envelope, mounting requirements, interface dimensions and applicable
dimensional tolerances. Dry weight shall be recorded. Finish, material, and workmanship shall
be visually inspected for conformance to the specification requirements (see 3.6, 3.8, and 3.9).
4.8.2 Manual operation. The coupling shall be tested to determine conformance to 3.7.2.
The coupling shall be coupled and uncoupled without the use of tools with a pressure of 60 psi
(see table IV) applied to both halves. The bulkhead half (aircraft halve coupling) shall be
securely mounted in a fixed position for this test. One hand shall be used to couple the coupling.
This test shall be repeated five times without malfunction, and the fluid loss (spillage) plus
leakage shall not exceed the values specified in table III. Couplings shall be inspected during
this test to ensure compliance with 3.5 and while coupled and unlocked positions the coupling
remains stable and permit fluid flow.
4.8.3 Immersion. Test couplings shall be immersed continuously in hydraulic fluid for a
period of 72 hours at a fluid temperature of 275 °F +5 °F prior to conducting the qualification
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