MIL-DTL-5508C
show any leakage in excess of that specified in 4.5.3, as observed by movement of the actuating
cylinder piston.
4.5.10 Bleeding. The fuse shall be installed in accordance with figure 1 with the fuse
completely void of fluid and without bleeding. Rated flow shall be directed through the fuse in
the direction for closing. The quantity of fluid passed through the fuse before closing shall be
measured. The fuse shall pass its volumetric capacity without preliminary bleeding.
4.5.11 Resetting. The apparatus shall be set up in accordance with figure 7.
4.5.11.1 Type I (AN6281). For fuses that do not require reverse flow for resetting, the
relief valve shall be set at the rated pressure and flow shall be passed through the fuse until it
closes. Rated pressure shall then be applied to the downstream side of the fuse while maintaining
pressure on the upstream side for a maximum of five seconds, following which rated flow shall be
passed through the fuse. The fuse shall fully reset itself within a five-second period without the
aid of reverse flow. The quantity of fluid passed through the fuse before it closes shall be
measured and shall be within the limits specified on figure 2.
4.5.11.2 Type II (AN6282). For fuses that require reverse flow in order to reset, the
relief valve shall be set at the rated pressure and flow shall be passed through the fuse until it
fully closes. The fuse shall fully reset itself after passage of a maximum of eight cubic inches or
20 percent of the rated volumetric capacity, whichever is greater, in the reverse flow direction at
the rated flow capacity. The rated flow shall then be applied through the fuse in the direction for
closing. The quantity of fluid passed before the fuse closes shall be measured and shall be
within the limits specified on figure 2.
4.5.12 Burst pressure. The hydraulic fuse shall withstand, without rupture, a hydrostatic
pressure equal to 2.5 times the rated pressure. The pressure shall be gradually increased until the
specified burst pressure is reached. The pressure rise shall be 25,000 psi (+0 psi, - 10,000 psi)
per minute.
4.6 Internal treatment. Following the inspection, sampling, and test procedures specified
above, each fuse shall be internally flushed with hydraulic preservative oil conforming to
MIL-PRF-6083 and contamination limits shall be as specified in MIL-PRF-6083. All parts shall
be capped and plugged with closures conforming to NAS 847 to prevent oil leakage.
4.7 Maintenance of qualification. At specified intervals determined by the qualifying
activity, the manufacturer must be able to demonstrate that the company still has the capabilities
and facilities necessary to produce the QPL items in accordance with this specification and the
provisions governing qualification specified in SD-6.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as
specified in the contract or order (see 6.2). When packaging of 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
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