Studies have shown that significant improvements in aircraft effectiveness (availability, mission success, spares, aerospace ground equipment requirements) will result if system monitoring and fault isolation can be done in-flight during actual operation of those avionics systems which have the lowest reliabilities. The Central Airborne Performance Analyzer (CAPA) was used in this program to demonstrate the feasibility of in-flight fault isolation. The CAPA was installed in an RF4C aircraft and interfaced with the electronics systems of the side-looking radar, infrared detecting set, and KS72 camera without altering the circuitry of these systems. Data gathering missions were flown to acquire information about the signals being monitored. The CAPA was then programmed to continuously monitor the aircraft systems, detect any malfunction, isolate the malfunction to a line replaceable unit (LRU), and print the location of the malfunction along with the time of occurrence. In short, the CAPA produces an easily understood maintenance message which is available to the flight line crew immediately upon aircraft landing, without the use of flight line aerospace ground equipment or any ground data processing. Data developed diring the test program proved the technical feasibility and showed that the application of CAPA to RF4C reconnaissance systems would increase the aircraft's effectiveness by 30 percent through increased aircraft availability and a greater number of successful missions. (Author)


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