MIL-DTL-5508C
4.2 Inspection conditions.
4.2.1 Fluid. The hydraulic fluid used for all qualification inspections shall conform to
MIL-PRF-5606. Conformance inspections may be performed with oil conforming to
MIL-PRF-5606 or MIL-PRF-6083.
4.2.1.1 Fluid filter. The test fluid shall be continuously filtered through a filter element or
elements that will ensure a contamination limit of Class 5 in accordance with NAS 1638.
Procedure and records of the testing results to assure conformance with this limit shall be
maintained and shall be made available to appropriate government activities upon request. The
filter and element used shall be satisfactory for the temperature range encountered and shall be
cleaned or replaced regularly to avoid clogging.
4.2.2 Temperature. Except where otherwise specified, tests shall be conducted at a room
temperature of 70 °F to 90 °F (21 °C to 32 °C) and an oil temperature of 90 °F to 110 °F (32 °C
to 43 °C). The oil temperature during the tests shall be recorded.
4.3 Qualification inspection.
4.3.1 Test samples. Unless otherwise specified by the qualifying activity, qualification
tests shall be conducted on two samples of hydraulic fuses.
4.3.1.1 Minimum clearance sample. One of the hydraulic fuses to be tested shall be
assembled of parts that have been selected to provide that the clearance with regard to linear and
diametral tolerances between moving and non-moving members, conducive to malfunctioning at
extreme temperatures, will not exceed 110 percent of the minimum designed clearance permitted by
the manufacturer's drawings. For cases of sliding where packing friction would influence the
performance of the component, such as pistons operated by springs, the maximum packing friction
anticipated shall be induced in the test specimen. In these cases, o-ring packing glands shall be
designed to provide maximum o-ring squeeze, including the effect of adverse o-ring cross section
tolerances and high swell fluids. This specimen shall be marked "MIN".
4.3.1.2 Maximum clearance sample. The second specimen shall be assembled of parts
that have been selected to provide that the tolerances, with regard to linear, diametral and
concentric tolerances between moving members, conducive to malfunctioning as a result of wear
associated with prolonged operation, shall not be less than 90 percent of the maximum designed
clearance permitted by the manufacturer's drawings. This specimen shall be marked "MAX".
4.3.1.3 Clearance sample tests. The manufacturer shall apply all tests of 4.5 to the
"MAX" sample, with the exception of the extreme temperature operation tests of 4.5.7. The
"MIN" sample shall be subjected to all tests specified in 4.5.
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