MILPRF55110G
APPENDIX A
A.3
A.3. REQUIREMENTS
A.3.1
A.3.1 General. The performance requirements contained in this section, although sometimes determined by
examination of sampled printed wiring boards or test coupons, apply to all deliverable printed wiring boards.
A.3.1.1
A.3.1.1 Master drawing (see A.6.2.1.c). Printed wiring boards delivered under this specification shall be of the
material, design, and construction specified on the applicable master drawing. For the purposes of this appendix,
when the term "specified" is used without additional reference to a specific location or document, the intended
reference shall be to the applicable master drawing. If individual design details are not specified on the applicable
master drawing, then the baseline design parameters shall be as detailed in the design standard that was used to
design the printed wiring board (see A.3.3).
A.3.2
A.3.2 Qualification. Printed wiring boards furnished under this specification shall be products that are authorized
by the qualifying activity for listing on the applicable QPL at the time of award of contract (see A.4.5 and A.6.3). In
addition, the manufacturer shall certify that the product assurance procedure requirements of A.4.5.5.2 have been
met and are being maintained.
A.3.3
A.3.3 Design (see A.6.2.1.d). Printed wiring boards shall be of the design as specified (see A.3.1.1). Unless
otherwise specified, if individual design details are not specified on the applicable master drawing, then the baseline
design parameters to be use for acceptability of finished product requirements shall be as detailed in the design
standard that was used to design the printed wiring board. If no design standard is specified on the master drawing or
the appropriate design standard cannot be determined, then the default design shall be performance class 3 of
A.3.3.1
A.3.3.1 Test coupons. Test coupon design and placement on a panel shall be in accordance with the applicable
design standard specified (see A.3.1.1). Test coupon selection, usage, and quantity on a panel shall be determined
by the manufacturer in order to meet the in-process, group A, and group B inspection requirements. NOTE: Test
coupon design shall be as specified in the applicable design standard and shall reflect worst case design conditions of
the printed board(s) they represent.
A.3.4
A.3.4 Material. The printed wiring boards shall be constructed of material as specified (see A.3.1.1). When a
definite material is not specified (see A.3.1.1), a material shall be used that will enable the printed wiring board to
meet the performance requirements of this specification. Acceptance or approval of any material shall not be
construed as a guaranty of the acceptance of the finished printed wiring board.
A.3.4.1
A.3.4.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
A.3.4.2
A.3.4.2 Pure tin. Unless otherwise specified (see A.3.1.1), the use of pure tin, as an underplate or final finish, is
prohibited both internally and externally. Tin content of printed board finishes and solder shall not exceed 97 percent,
by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see A.6.8).
A.3.5
A.3.5 External visual and dimensional requirements. When examined in accordance with A.4.8.1, the finished
printed wiring board shall meet the visual and dimensional requirements specified in A.3.1.1 and A.3.5.1 through
A.3.5.7.5. IPC-A-600 contains figures, illustrations, and photographs that can aid in the visualization of externally
observable accept/reject conditions of test specimens. If a condition is not addressed herein or specified on the
master drawing, it shall comply with the class 3 criteria of IPC-A-600.
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