MIL-PRF-39035 Resistor, Variable, Nonwirewound \(Adjustment Type\), Nonestablished Reliability, And Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\) and established reliability \(ER\), multiturn lead-screw actuated, and single-turn, nonwirewound, variable resistors with a contact bearing uniformly over the surface of the entire resistive element, when positioned by an actuator. These resistors are capable of full-load operation \(when the maximum resistance is engaged\), at a maximum temperature of 150 Degrees C, with a resistance tolerance of ??10 percent. The ER resistors will have life failure rate levels ranging from 1.0 to 0.001 percent per 1,000 hours \(see 1.2.1.5\). These failure rate levels are established at a 60 percent confidence level maintained at 10 percent producer\'s risk on the basis of the life tests.

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MIL-PRF-39035E

APPENDIX A

PROCEDURE FOR QUALIFICATION INSPECTION

A.1 SCOPE

A.1.1 Scope. This appendix details the procedures for submission of samples for qualification inspection of

resistors covered by this specification. The procedure for extending qualification of the required sample to other

resistors covered by this specification is also outlined herein. This is a mandatory part of the specification. The

information contained herein is intended for compliance.

A.2 APPLICABLE DOCUMENTS

A.2.1 Government documents.

A.2.1.1 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 (see 6.2).

DEPARTMENT OF DEFENSE STANDARDS

Leads for Electronic Component Parts

(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).

A.2.2 Order of precedence. In event of a conflict between the text of this document and the references cited herein

(except for related associated specifications, specification sheets, or MS sheets), the text of this document takes

precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific

exemption has been obtained.

A.3. SUBMISSION

A.3.1 Product levels. Qualification of the C (non-ER) level, is predicated upon meeting the ER qualification

requirements for FR level M (see A.4.1) and the completion of the qualification lot through the 10,000 hour life test.

The procedure for submitting samples to become qualified to the initial FR level M is specified in A.3.2 of this

appendix.

A.3.2 Sample. The sample size and test routine for each style shall be as indicated in table A-I. After qualification

has been granted, no change shall be made in materials, design, or construction without prior notification to the

qualifying activity.

A.4. EXTENT OF QUALIFICATION

A.4.1 Extent of qualification. The resistance range included in the qualification of any one resistor style will be

between the highest and lowest resistance values inspected. Qualification of characteristic H is basis for qualification

of F and C, qualification of characteristic F is basis for qualification of characteristic C. Characteristic C qualifies

characteristic C only. Qualification of one terminal type may be extended to other terminal types provided the internal

construction is the same and additional testing is performed in accordance with table A-I. The extent of qualification

between FR levels shall be specified in table A-II.