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Track 2 Session 8
2:20 to 3:20 p.m. Thursday March 27, 2008

Using FRACAS Data to Analyze the Achieved Reliability for an Aircraft Radar Operated by the Swedish Air Force

During the period 1971-01-01 to 2000-12-31, more than 100 Saab AJ 37 Viggen aircraft were operated by the Swedish Air Force. During this period, more than 212.000 flight hours were accumulated. All discovered failures were reported using a Failure Reporting, Analysis and Corrective Action System (FRACAS) called DIDAS. The reported failures were classified as relevant or not relevant. The classification was carried out in cooperation by representatives from the Swedish Air Force, the Central Workshop and the producer of the radar system, i.e. Saab Microwave Systems (formerly Ericsson Microwave Systems AB). This case study illustrates how the analysis of FRACAS data can be a very effective and important tool for reliability work employed by both the user and the producer in order to address all failures reported from operation and maintenance. It can help to:

  • Analyse and correct failures
  • Perform better predictions of failure rates and MTBF by using field data in the predictions according to similarity analysis
  • Find out when infant mortality period ends
  • Find out the time for the best period
  • Find out if a wearout period exists
  • Calculate the need of spare parts initially and later on
  • Calculate the amount of NFF (No Fault Found)
  • Estimate reliability growth period in theory and practice
  • Define the need of design changes
  • Define need of preventive maintenance
  • Define safety-related failures

Key Words: FRACAS (Failure Reporting and Corrective Action System), Reliability Prediction, MTBF, MFTBF (Mean Flight Time Between Failures), Similarity Analysis, Best Period, NFF (No Fault Found), Reliability Growth

Gilbert Markling
Saab Microwave Systems
Sweden

 

 

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