Investigation of the effect of IRAN (inspect and repair as necessary) depot maintenance on the F-106 aircraft. This effect is measured in terms of aircraft performance (using ADCM 66-28 data) before and after IRAN, and in terms of interval length between successive IRANs. Results indicate that aircraft are not in a degraded condition prior to IRAN, and are not improved by IRAN. Further, aircraft with long intervals (calendar time or flying hours) between successive IRANs are not in worse condition than those with short intervals. In addition, there is no measurable significant difference in depot maintenance manhours as a function of interval between IRANs. When this study was conducted in early 1970, the results did not support the then current Air Force policy that required an F-106 IRAN at two year intervals.
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