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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MIL-L-81542A, Life Raft, Inflatable, One- Man, Type LR-1

MIL-PRF-81542B, Life Raft, Inflatable, Single-Place

base patch, reinforcing the attachment of the oral inflation tube, shall coincide with the opening in the oral inflation tube.  The adhesive shall be applied in a straight line parallel to the edges of the seam tapes, seams,

patches, and attachments and shall extend from just being visible to a maximum of one inch

beyond the edges of the seam tape, seam,

patch, and attachment.  The seam tapes, which seal circumferential seams, or where one end of the seam tape comes in contact with the other end of the same seam tapes or another seam tape, shall overlap on itself, at the ends,

3/4 , plus 1/2, minus 0, inch.  The adhesive, when dry or cured, shall present a neat and uniform appearance.  The adhesive shall not be allowed to remain in clots, and upon drying or curing shall not cause the cloth, seam tapes,

and attachments to shrink or pucker at any point on the life raft.  The life raft shall be free from congealed masses of the adhesive and spots or stains resulting from excessive adhesive.

3.4.4    Seams and stitching.  No stitching shall be used in any of the life raft seams, through the cloth of any air retaining chamber, or through the life raft floor.  Sewing shall only

be used in the construction of the accessory parts but not in their final attachment to the life raft.  All the machine stitching in the accessory parts shall be accomplished as specified in the applicable drawings.  All the sewing, except

for the bartacks, shall be accomplished with Stitch type 301 conforming to FED-STD-751 and shall contain 6 to 10 stitches per inch. Each row of stitching shall be straight and parallel to the seam edge.  The straightness of the stitching, in any row, shall be maintained within a tolerance of plus or minus 1/32 inch.

The ends of the stitching shall be backstitched, by overlapping on itself, a minimum of 1/2 inch.  Thread breaks, skips, and run-offs shall be overstitched not less than one inch.  The

at 0 °F when tested as specified in 4.12.1.1. Inflation shall be without any hindrance to the flow of gas or restriction by any component or accessory. All the seams, seam tapes, sealed areas and attachments shall remain perfectly intact and shall show no evidence of separation. There shall be no evidence of

construction or material failure in any respect.

3.20.1.2 High temperature. The life raft shall inflate to design shape within 60 seconds at

160 °F when tested as specified in 4.12.1.2. Inflation shall be without any hindrance to the flow of gas or restriction by any component or accessory. All the seams, seam tapes, sealed areas and attachments shall remain perfectly intact and shall show no evidence of separation. There shall be no evidence of construction or material failure in any respect.

3.20.4 Accelerated aging/life cycling. The packed life raft shall withstand the effects of accelerated aging/life cycling when tested as specified in 4.12.4. The life raft shall inflate to design shape within 60 seconds when actuated as specified in 4.12.4. Inflation shall be

without any hindrance to the flow of gas or restriction by any component or accessory. All the seams, seam tapes, sealed areas and attachments shall remain perfectly intact and shall show no evidence of separation. There shall be no evidence of construction or material failure in any respect. Immediately following this test, the raft shall be visually examined as specified in 4.5, and pressure/leakage tested as specified in 4.10.