MIL-STD-1285D
APPENDIX N
N.3.1.2 Method I marking (for QPL parts).
N.3.1.2.1 Printed circuit and printed wiring boards. Each production printed wiring board, each qualification test specimen, and each set of conformance test circuit strips (as opposed to each individual test coupon) shall be marked in accordance with the master drawing. As a minimum, each production printed wiring board, qualification test specimen, or conformance test circuit strip shall reference the printed wiring board manufacturer's CAGE (Commercial and Government Entity), lot date, and printed wiring board traceability code. The marking shall be produced by the same process used in producing the conductive pattern; or by the use of a nonconductive, fungistatic ink, or paint applied to the printed wiring board, or to a label which is applied to the printed wiring board, or by mechanical pencil marking on a metallic area provide for marking purposes. All marking shall be able to withstand solder fluxes, cleaning solutions, and molten solder encountered in the manufacture of printed wiring boards, shall remain legible after all tests, and in no manner affect printed wiring board performance.
N.3.1.3 Method II marking (for QML parts). Marking of compliant printed boards and their associated test coupons shall be in accordance with MIL-PRF-31032, the following requirements, and the identification and marking provisions of the printed board procurement documentation. The marking shall be permanent, legible, complete, and shall meet the marking adhesion requirements of the associated specification sheets. If any additional marking is used or required by the printed board procurement documentation, it shall in no way interfere with the marking required herein, and shall be visibly separated. Only the QML manufacturer is authorized to apply the QML brand.
N.3.1.3.1 Full marking. Unless otherwise specified by the printed board procurement documentation, the following full marking shall be placed on each printed board and test coupon strip:
a. "QML" or "Q" brand.
b. Printed board Part or Identifying Number (PIN) with revision level (when applicable) or other special coding system detailed by the procurement documentation.
c. Lot date code.
d. QML manufacturer's CAGE code. e. Traceability.
N.3.1.3.2 Minimum marking. When the physical size of the printed board precludes the placement of the information specified in N.3.1.3.1, the minimum marking shall be as specified in the printed board procurement documentation. In those cases where full marking requirements are not on the printed board, the full marking shall be placed on the unit package.
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