MIL-PRF-19500P
APPENDIX H
CRITICAL INTERFACE AND MATERIALS
H.1 SCOPE
H.1.1 Scope. This appendix contains critical interface information which will assist manufacturers in producing
devices which meet 3.2. This appendix is a mandatory part of the specification. The information contained herein is
intended for compliance.
H.2 APPLICABLE DOCUMENTS
H.2.1 General. The documents listed in this section are specified in sections H.3, H.4, or H.5 of this specification.
This section does not include documents cited in other sections of this specification or recommended for additional
information or as examples. While every effort has been made to ensure the completeness of this list, document
users are cautioned that they shall meet all specified requirements of documents cited in sections H.3, H.4, or H.5 of
this specification, whether or not they are listed.
H.2.2 Government documents.
H.2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a
part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are
those, cited in the solicitation or contract
FEDERAL STANDARDS
FED-STD-H28
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Screw-Thread Standards for Federal Services.
(Copies of these documents are available online at https://assist.daps.dla.mil/quicksearch/ or
https://assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D,
Philadelphia, PA 19111-5094.)
H.2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited
herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws
and regulations unless a specific exemption has been obtained.
H.3 CRITICAL INTERFACE AND CONSTRUCTION CRITERIA
H.3.1 Allowable alternate design, materials, and construction. Multiple device designs may be approved by the
qualifying activity on a case by case basis for JAN, JANHC, JANKC, JANTX, and JANTXV per manufacturer (per
corporation for companies within multiple divisions), provided appropriate identification is provided to ensure
traceability and a valid need is demonstrated. For JANS devices, only one design is allowed per manufacturer (per
corporation for companies within multiple divisions), and it may differ from the design of other quality levels. For
radiation hardened devices of all levels, only one design is allowed, and it may differ from the design of non-radiation
hardened devices. With the approval of the qualifying activity (see D.3.4.2), design material and construction
alternatives for qualified device types may be allowed only for a limited time. An alternate design submitted for
approval shall be definitive of all pertinent construction features. Particular design features are not interchangeable
between approved designs. A single inspection lot or sublot, in the case of lots made up of sublots of structurally
identical devices, shall contain only one approved design, material, and construction so that homogeneity is
preserved within a given lot identification code and device type. The qualifying activity shall be notified of the first lot
incorporating the change and the last lot of the present existing design and effective date codes for each. If the
existing design is to be maintained, the manufacturer shall justify the retention, subject to approval by the qualifying
activity. The qualifying activity may periodically identify specific alternate designs by device type and specification
sheet and request justification for continued retention of that specific alternate design.
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