MIL-DTL-8971F
SR 2
SC2
2
SG
⇒ 2 or 2
F=
S
S
2
R
C
SL
Where S is the standard deviation of the test results, the subscript G indicates the greater of the
two standard deviations, and L the lesser. Again, the subscript R and C in the two example
equations on the right identify the variable as belonging to the reference or candidate electrodes.
The greater value must be the numerator, as the desired resultant value must be equal to or
greater than one.
c. Laboratory approved for accuracy and repeatability testing: Electrode accuracy and
repeatability testing can only be performed at a JOAP-EC-certified laboratory. The laboratories that
are currently approved for the conduct of electrode accuracy and repeatability tests for products that
are covered by this specification are the JOAP-EC laboratory at 85 Millington Avenue, Pensacola,
FL 32508-5010, and the Army Oil Analysis Program (AOAP) Laboratory at Building 3661 Ajax
Rd., Redstone Arsenal, AL 35898-7466. Contracting officers may obtain the costs for such testing,
and the availability of other qualified laboratories, by contacting the JOAP-EC by letter or by
facsimile to (850) 452-2348.
d. Special oil standards: The D-19 series Primary Reference Calibration Standards are
oil samples that are blended with carefully controlled levels of nineteen elements (see tables I
and II), and are used in the accuracy and repeatability testing of candidate electrodes, for factory
calibration of DoD JOAP-EC atomic emission rotrode spectrometers, and for spectrometer
standardization prior to electrode testing. The D-19 primary oil standards are available under
NSN 9150-01-355-1178 as a set containing each of the following elemental concentration levels:
0, 5, 10, 30, 50, 100, 300, 500, 700, and 900 ppm.
4.7 Retention of qualification. To retain qualification, manufacturers shall submit a
qualification retention report to the qualifying activity annually, with a copy to the preparing
activity (if different), and to the JOAP-EC. The qualifying activity shall establish the initial
reporting date for each manufacturer. The report shall consist of an information and certification
document, signed by a responsible company official, and a summary of the results of all
conformance inspections performed since the most recent qualification retention report,
qualification, or requalification, whichever occurred last. At the option of the qualifying activity,
the information and certification document may be a DD Form 1718 (Certification of Qualified
Products) or it may be a more detailed questionnaire. The summary of results of conformance
inspections shall identify the number of lots of products that were manufactured for delivery to
the Government by the manufacturer during the period, the number of lots that passed
conformance inspection, and the number of lots that failed conformance inspection. For the
failed lots, the summary shall include the numbers and types of failures. The results of
inspections of all reworked lots shall be identified and accounted for in the report.
4.7.1 Retention of qualification inspection. In addition to the requirements of 4.7, every 36
months following the most recent qualification or requalification, the manufacturer shall be
responsible for the performance of density, resistivity, and flexural strength inspections (see
16
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