MIL-PRF-39015 Resistors, Variable, Wirewound, \(Lead Screw Actuated\), Nonestablished Reliability, And Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\) and established reliability \(ER\), lead screw actuated; wirewound variable resistors with a contact bearing uniformly over the surface of the entire resistive element, wound linearly, when positioned by a multiturn lead screw actuator. These resistors are capable of full load operation \(when the maximum resistance is engaged\), at a maximum temperature of 85OC and are capable for continuous operation, when properly derated, at maximum temperature of 150OC \(see 3.6\), with a resistance tolerance of ??5 percent. The ER resistors have life failure rate \(FR\) levels ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.4\). These FR levels are established at a 60 percent confidence level on the basis of life tests.

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MIL-PRF-39015E

DEPARTMENT OF DEFENSE STANDARDS

- Electronic and Electrical Component Parts, Test Methods for.

- Failure Rate Sampling Plans and Procedures.

- Standard Practice for Established Reliability and High Reliability Qualified

Products List (QPL) Systems for Electrical, Electronic, and Fiber Optic Parts

Specifications

MIL-STD-810 - Environmental Test Methods and Engineering Guidelines.

MIL-STD-1285 - Marking of Electrical and Electronic Parts.

(Copies of these documents are available online at https://assist.daps.dla.mil/quicksearch/ or

https://assist.daps.dla.mil or from the Standard Document Order Desk, 700 Robbins Avenue, Building 4D,

Philadelphia PA 19111-5094.)

2.3 Non-government publications. The following documents form a part of this document to the extent

specified herein. Unless otherwise specified, the issues of the documents which are those listed in the

solicitation or contract.

ELECTRONIC INDUSTRIES ASSOCIATION (EIA)

Assessment of Average Outgoing Quality Levels in Parts Per Million (PPM).

Statistical Process Control Systems (SPC).

(Copies of these documents are available from https://www.geia.org or from the Electronic Industries

Association, 2500 Wilson Boulevard, Arlington, VA 22201-3834.)

2.4 Order of precedence. In the event of a conflict between the text of this document, and the

references cited herein (except for 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.

3. REQUIREMENTS

3.1 Specification sheets. The individual item requirements shall be as specified herein and in

accordance with the applicable specification sheet. In the event of any conflict between the requirements

of this specification and the specification sheet, the latter shall govern (see 6.2).

3.2 Qualification. Resistors furnished under this specification shall be products that are authorized by

the qualifying activity for listing on the applicable Qualified Products List (QPL) before contract award

(see 4.4 and 6.3). In addition, the manufacturer shall obtain certification from the qualifying activity that

the QPL system requirements of 3.3 and 4.2 have been met and are being maintained. Authorized

distributors that are approved to MIL-STD-790 distributor requirements by the QPL manufacturer are

listed in the QPL.

3.3 QPL system. The manufacturer shall establish and maintain a QPL system for parts covered by

this specification. Requirements for this system are specified in MIL-STD-790 (all product levels) and

MIL-STD-690 (ER part only). In addition, the manufacturer shall also establish a Statistical Process

Control (SPC) and Part Per Million (PPM) system that meets the requirements as described in 3.3.1 and

3.3.2 respectively.