combiners. Specific requirements tailored for ┬ôspace flight application┬ö components are included to represent the highest reliability components specified herein. Such components are intended for use in NASA manned, satellite, interplanetary or launch vehicle programs.

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MIL-DTL-23971D

3.6.14 Temperature cycling screen. When items are tested as specified in 4.7.23, VSWR (4.7.4), insertion loss

(4.7.5), and isolation (4.7.6) tests shall be conducted following the temperature cycling screen, to confirm success or

failure.

3.7 Marking. The items shall be marked in accordance with MIL-STD-1285, method I, with the part or identifying

number (PIN) and the manufacturer's source code (CAGE). Marking characters shall be approximately .125 inch

(0.32 mm) in height. The marking shall be placed on the identification plate, using a method which will provide legible

and permanent marking for the life of the item. The manufacturer's name or trademark may also be included in the

marking provided such is not expressly forbidden in the contract. When space does not permit use of an

identification plate or when component usage (eg. space applications) forbids use of a label or plate, marking may be

applied directly on a flat or cylindrical surface of the body. Letter size may be reduced to accommodate the following:

PREFERRED

M23971/

military designator and specification number

XX-YY

specification sheet (XX) and dash (YY) no.

ZZZZZ

Manufacturer's source code (CAGE)

PERMISSIBLE

military designator

23971/

specification number

XX-YY

specification sheet (XX) and dash (YY) no.

ZZZZZ

Manufacturer's source code (CAGE)

3.7.1 Special marking. When acquisition requirements (see 6.2) specify, items shall be specially marked with a

four digit date code denoting the last two digits of the calendar year (first two digits) and the week of the calendar

year (last two digits) when the item was manufactured. Date code marking facilitates process improvement, failure

analysis and reliability enhancement.

3.8 Serialization. When the contract requires the items be serialized, each item shall be marked with a unique

serial number assigned consecutively within the inspection lot, allowing traceability to the item and test results.

3.9 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.

3.10 Workmanship. The items shall be manufactured and processed in such a manner as to be uniform in quality,

and external surfaces shall be free from tool marks, burrs, deep scratches, and other defects that will affect life,

serviceability, or appearance.

4. VERIFICATION

4.1 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities of sufficient

accuracy, quality, and quantity to permit performance of the required inspection shall be established and maintained

by the contractor. The establishment and maintenance of a calibration system to control the accuracy of the

measuring and test equipment shall be in accordance with NCSL-Z540.3.

4.2 Classification of inspections. The inspection requirements specified herein are classified as follows:

Materials inspections (see 4.3).

First article inspection (see 4.5).

Conformance inspection (see 4.6).