APPENDIX H – RELIABILITY
Page H-3
UAS ROADMAP 2005
Table H-1 summarizes the reliability metrics for all military UA examined in this study. With respect to the required values as outlined in the operational requirements and specifications, green and red signify instances in which the actual values meet or fall short of the requirements, respectively. In the case of the mishap rate per 100,000 hours, no requirements were identified. In addition, requirements are not available for the RQ-1A/Predator due to their development after concluding its ACTD (discussed later in this appendix), nor are they available for the Global Hawk due to relatively low flight hours.
The mishap rate per 100,000 hours is presented in two ways. The model/series mishap rate illustrates “before and after” gains made in reliability and operations between subsequent versions of the same UA model. The model mishap rate is a snapshot of the combined performance of all versions of each UA model. It incorporates all mishaps over that fleet’s cumulative flight hours.
In all cases except for the RQ-2/Pioneer, the UA systems examined in this study exceed operational requirements. The shortfalls in the RQ-2A reliability performance (shown in red) were amended with the next generation RQ-2B with the exception of the availability metric. Table H-2 presents the failure modes analysis for each UA model.
TABLE H-2: SUMMARY OF UA FAILURE MODE FINDINGS
Power/ Propulsion Flight Control Comm Human/ Ground Misc
Aircraft RQ-1A/ Predator 23% 39% 11% 16% 11%
MQ-1B/ Predator 53% 23% 10% 2% 12%
RQ-2A/ Pioneer 29% 29% 19% 18% 5%
RQ-2B/ Pioneer 51% 15% 13% 19% 2%
RQ-5A/ Hunter* 38% 5% 31% 7% 19%
RQ-7/ Shadow 38% 0% 0% 38% 24%
* The vast majority of all Hunter aborts (58 percent) were due to weather.
There are several noteworthy trends from the summary data in Table H-2.
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