Abstract The turret assembly when assembled into the M-ATV was not functioning as intended. The problem as presented to the OEM was that the system level TIR was excessive at the stop ring in the vehicle, and that if controlled to less than .060" at the system level, the unit would function properly. We were asked to converge down to the source of the problem and statistically prove root cause to a confidence level of 95%. Challenge Inspect and segregate fully assembled BOB and WOW vehicles so we could swap components between the units. The delivery schedule for M-ATV was aggressive and holding vehicles was difficult. Working at the extremes of the distribution of interest allowed for small sample sizes to be used. Execution ? Disassemble and reassemble BOB and WOW units while maintaini

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