RMQSI Answers ForumCategory: Non-Electrical Component ReliabilityQuestion on NPRD 2016 Failure Rate in AC environment
Tequila asked 1 year ago

Dear all,
Working in design, I wonder if for any AC Failure Rate taken in NPRD 2016, if it can be considered as a failure rate in Flight Hour ? Also, how to take in account the notion of flight cycle for any AC Failure Rate taken ?
Indeed, parts are not always sollicitated or as sensitive than electronic parts, and if we take the example of the following parts from NPRD 2016 for aircraft products for example that are sollicitated only during all ground phases, and more in landing phases for braking mechanical / hybrid / electrical with still mechanical parts:

  • Brake Assembly,Hydraulic > FR of 3,48281E-07 in AC environment,
  • Wheel Assembly > FR of 4,38000792E-04 in AC environment,
  • Wheel Half > FR of 6,830149E-04 in AC environment,
  • Wheel Half Assembly > FR of 4,902790E-04 in AC environment,
  • Wheel Assembly,Aircraft > FR of 5,35586476E-04 in AC environment,
  • etc.

To conclude, I face the context where sometimes:

  • I have to analyze products where there are not as sollicitated or as sensitive than electronic parts,
  • I work with partners, that propose methodologies to convert some NPRD 2016 failure rates with factors OH > FH, loading factors, etc.,

and at a certain point, I ask those questions here as I would like to freeze some endless debates I am regularly facing.
Regards,
Tequila.