MIL-J-7093A (Weps)
parts. Each group of four (4) motors shall be conditioned and test fired (in accordance with 4.8.3) alternately at -75°F and at 150°F.
4.5.2.3. 2
Acceptance. - Acceptance of the sixteen (16) lots from which the
sample of four (4) was withdrawn shall be based on the ballistic performance of the test motors selected therefrom.
4.5.2. 4 Control Charts. - The contractor shall maintain statistical control charts for each of the five (5) basic ballistic parameters (paragraph 3.3.1) for
alI motors submitted for acceptance under the Normal Sampling Schedule at each of the temperatures -75°F and 150°F.
4.5.2. 5 Range Charts. - A "statistical control index rating", QR, for each of the range charts shall be computed according to the formula:
Where
a is the percent of values on the range chart outside of the 3 limit, (paragraph 4.6).
4.5.2. 6 Data and Calculations. - Prior to initiation of the Normal Sampling Schedule, the contractor shall submit data and necessary calculations to demonstrate that the statistical control index rating for each of the range charts is at least 85% for 200 consecutive firings.
4.5.2. 7 Range Chart Index Rating. - As part of the requirements for continued application of the Normal Sampling Schedule, the statistical control index rating for the range charts (4.5.2.5) shall be computed continuously. The computation shall include data from 50 sub-groups accumulated prior to the time of calculating statistical control index ratings. Continuance of the Normal Sampling Schedule requires, in part, that the statistical control index rating for the range charts shall be at least 85%. If the computed value is less than 85%, the Normal Sampling Schedule shall be discontinued immediately, and the Intermediate Production
Schedule shall be applied. A value of less than 85% for the index rating shall not be cause for rejection of units accepted under the Normal Sampling Schedule (para- graph 4.5.2.3). In order to resume the Normal Sampling Schedule, the con-
tractor shall submit data and necessary calculations to demonstrate that the sta-
tistical control index rating for each of the range charts is at least 85% for 200 consecutive firings, or that the factor responsible for the low QR rating has been found and corrected.
4.5.2. 8
Mean Value. - A "statistical control index rating", Qx, for each
of the mean value charts (4.5.2.4) shall be computed according to the formula:
graph 4.6).
Where:
b is the percent of values outside of the limits (para- 7
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