MILPRF50884F
6.4 Terms and definitions.
6.4.1 Acquiring activity. The organizational element of the Government which contracts for articles, supplies, or
services may authorize a contractor or sub-contractor to be its agent. When this organizational element of the
Government has given specific written authorization to a contractor or sub-contractor to serve as agent, the agent will
not have the authority to grant waivers, deviations, or exceptions to this specification unless specific written
authorization to do so has also been given by the Government organization, which is the preparing activity or
qualifying activity. In the absence of a specific acquiring activity, the acquiring activity will be an organization within
the supplier's company that is independent of the group responsible for device design, process development, or
screening, or may be an independent organization outside the supplier's company.
6.4.2 Design standard. A document that establishes the baseline parameters (default values), standard practices
and guidelines for the design of printed wiring boards. Within this document, the term "design standard" is used to
describe those documents that contains the design, construction, material, and test coupon requirements and
guidelines used to produce panels of flexible printed wiring boards.
6.4.3 Printed wiring board type. The printed wiring board type should be as specified in IPC2223. The legacy
printed wiring board types of MILSTD2118 correspond to the types described in IPC2223 and are listed herein.
6.4.3.1 Type 1. Type 1 flexible printed wiring boards have only one conductive layer (single sided conductor
pattern) with coverlayer and no plating in the component holes. In addition, the design may contain shields or
stiffeners. Type 1 flexible printed wiring boards are usually designed for installation use B (continuous flex)
applications.
6.4.3.2 Type 2. Type 2 flexible printed wiring boards are printed wiring boards with conductor patterns on both
sides of the printed wiring board (double sided). In addition, the design of the printed wiring board may require the
following: (1) that the holes through the base material be plated through to connect the conductor patterns on both
sides together, (2) with or without shields, and (3) with or without stiffeners. Type 2 flexible printed wiring boards are
usually designed for installation use B (continuous flex) applications.
6.4.3.3 Type 3. Type 3 flexible printed wiring boards are multilayered (with three or more conductor layers) with
plated-through holes. Type 3 printed wiring boards are usually designed for installation use A (flex to install)
applications.
6.4.3.4 Type 4. Type 4 flexrigid printed wiring boards are multilayered boards containing plated-through holes
with rigid sections connected by flexible sections. Type 4 printed wiring boards are usually designed to be used in
installation use A (flex to install) applications.
6.4.3.5 Type 5. Type 5 printed wiring boards are multilayer bonded rigid and flexible printed wiring board
combinations without plated-through holes. Type 5 printed wiring boards are usually designed to be used in
installation use A (flex to install) applications.
6.4.4 Product assurance. The method of complying with the two different levels of this document using either the
QPL method or the QML method.
6.4.4.1 QPL. A transitional program that allows a manufacturer that is certified and qualified to the QML program
of MILPRF31032 to fabricate, test, and supply products to appendix A of this revision of this document.
6.4.4.2 QML. A list of manufacturers, by name and plant address, who have met the certification and qualification
requirements stated in MILPRF31032. A QML focuses on qualifying an envelope of materials and processes
rather than individual products or designs. That envelope is qualified by carefully selecting representative worst case
test vehicles or representative samples from production that contain all potential combinations of materials and
processes that may be subsequently used during production. A QML is normally appropriate for items of supply that
have very rapid technological advancement or a myriad of variations or custom designs that make individual product
qualifications impractical or excessively expensive.
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