MIL-J-7093A (Weps)
4.5.2. 9 Mean Value Index Rating. - The statistical control index rating, Qx, for the mean values (4.5.2.8) shall be computed after each 200 firings. While the reduced normal sampling schedule is in effect, the contractor shall furnish the customer with copies of statistical control charts (4.5.2.4) along with computed QR values (4.5.2.5) and Qx values (4.5.2.8) at least after each
200 firings. The computation shall include data from 50 sub-groups accumu-
lated prior to the time of calculating statistical control index ratings. Action based on QR values has been previously specified in paragraph 4.5.2.7. Action based on Qx values is as follows:
4.5.2.9. 1 Qx has been greater than 85% for 200 consecutive firings; (a) The value of Su must be greater than 
(b) The assembled units represented by each group of four (4) test units shall be accepted if the average value, X, of all the ballistic properties specified (3.3.1) lies within the limits Su
and SL, (paragraph 4.6), and if all of the ballistic data for each of the test units are individually within the acceptance limits.
(c) If the average value requirement is not met, the assembled units represented by the four (4) test samples shall be tested in accordance with the Intermediate Production Schedule of one (1) firing per batch of propellant. If an individual value is outside of the acceptance limits of 3.3.1,the lot shall be re- jected. Failure to meet the condition (4.5.2.9.1(b) shall
not be cause for discontinuance of the Normal Sampling
Schedule.
4.5.2.9. 2 Qx has not been greater than 85% for 200 consecutive firings; (a) The value of Su must be greater than 
(b) The assembled units represented by each group of four (4)
test units shall be accepted if the average value, 
, of all the ballistic properties specified (3.3.1) lies within the limits SU an d
SL, and if all the ballistic data for each of the test units are individually within the acceptance limits (3.3.1).
(c) If the average value requirement is not met, the assembled units represented by the four (4) test samples shall be tested in
accordance with the Intermediate Production Schedule of one
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have been selected under the Normal Sampling Schedule shall
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