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F-22 Raptor Gets Zapped by International Date Line

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F-22 Raptor Gets Zapped by International Date Line - PowerPoint PPT Presentation

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F-22 Raptor Gets Zapped by International Date Line

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  1. F-22 Raptor Gets Zapped by International Date Line

  2. The Problem • The F-22 Raptor computer software failed when the aircraft crossed the International Date Line. IDL

  3. F-22 Glass Cockpit

  4. KC-10 saves the day!

  5. KC-10 Instrument Cockpit

  6. Safely back home, the investigation begins…

  7. What went wrong? • The Flight Management Software failed to properly process the location data as the F-22 flew from Hickam AFB (157° W) and crossed over the International Date Line (both 180° W and 180° E).

  8. International Date Line 1956 2007 1985 1884 1522 1937

  9. Inadequate requirements? • The system shall calculate the aircraft’s present position latitude and longitude in degrees, minutes, and seconds. • The system shall display the aircraft’s present position latitude and longitude in degrees, minutes, and seconds.

  10. Overlooked corner cases?

  11. Poorly developed code? • Rapidly changing technology from analogue to digital flight controls • Led to increasing software development • Software • Ada was mandated by government • Difficult to find/hire Ada developers

  12. Insufficient testing?

  13. Ready to fly, again.