During Category II TESTING THE F-111A flew 2,019 hours, generating approximately 31,000 reliability and maintainability data records. The majority of Category II tests were flown on preproduction aircraft; however, several production aircraft were also tested. This report covered only the last 22-month period so that the analysis would be more representative of production aircraft. The analysis utilized 1,240 of the flying hours and approximately 18,000 of the data records. The F-111A had a 0.83 probability of mission success during Category II testing versus a contractor specified reliability of 0.85. The 0.83 probability of mission success may be misleading because missions which might have been aborted operationally were considered successes when part of the planned mission test objectives were met. All other avionic subsystems were below the CEI specified MTBF's except for the Countermeasures Receiver Set and Radar Homing and Warning System which had insufficient testing time to determine an MTBF. The measured maintenance man-hours per flying hour for the F-111A during Category II testing was 82.3 hours as compared to the contract specification of 35. The subsystems that failed to meet the contractor's predicted values by a large margin were the same subsystems that had the low reliability figures. (Author)


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