SD-15 Guide For Performance SpecificationsThis document provides guidance information on performance specifications focusing primarily on stating requirements in performance terms and ensuring that sufficient verification means are included in the specification to evaluate conformance. While the focus of this document is on defense specifications developed under DoD 4120.24-M, Defense Standardization Program DSP Policies and Procedures, the principles and techniques can also be applied to program unique performance specifications, performance-based purchase descriptions, commercial item descriptions, or any other type of procurement specification. This guide is intended to supplement the format and content requirements for writing performance specifications found in MIL-STD-961, Defense and Program-Unique Specifications Format and Content.

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Performance Specification Guide SD-15

MIL-L-25370E, Valve, Pneumatic Inflator, (Life Preserver - M1-A)

MIL-PRF-25370F, Valve, Pneumatic

Inflator, (Life Preserver - M1-A)

cadmium plated hardened steel, having a case depth of 0.010 inch. The lever shall be in position with the staked stainless steel pin in the unoperated position. The lever shall lay against the side of the inflating assembly as shown in figure 1. Thread conforming to type

III, letter size E, color optional of V-T-295 shall be used for securing the lever in the unoperated

position. All edges of the lever shall have a

nominal radius or ten-thousandths of an inch.

3.5.1.3 Outlet. Each inflating assembly shall have an outlet for mounting on a valve stem conforming to Drawing 52A6598. The gas passages in the outlet shall align with the hole in the side of the stem regardless of which side of the outlet is toward the base of the stem.

3.5.1.4 Lock. Each inflating assembly shall have a screw-type lock to prevent loosening of an installed carbon-dioxide cylinder conforming to MIL-C-25369. The screw head shall be a slot-type and shall not extend above the inflating assembly when adjusted to tighten the carbon-dioxide cylinder. The screw head and the slot shall be rounded and free from burrs. The top of the tapped holes shall be countersunk smooth and free of burrs or sharp edges.

3.5.2 Lanyard. A lanyard conforming to Drawing 56K3881 shall be attached to the lever.

3.5.3 Gaskets. Gaskets shall be provided to seal the attachment points of the outlet and the inlet of the inflating assembly. The inlet gasket shall conform to Drawing 58A3567. The outlet gasket shall conform to Drawing 58A3568 and

58A3569.

3.5.4 Valve stem cap. A valve stem cap conforming to Drawing 52A6600 shall be provided to hold the inflating assembly in place on the valve stem.

stem.

3.6.2 Valve stem cap. A valve stem cap (see figure 2) shall be provided to hold the inflator valve in place on the valve stem.