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How frequently are avionics on large commercial aircraft updated? And how are the systems updated?

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Infrequently. Large fleets, lots of down time, lot of equipment to buy.

The fleets are cycled thru at a refittng center where the panels are disassembled and re-assembled. Here is one example

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  • $\begingroup$ Though the post doesn't specify it is tagged with software, which wouldn't necessarily require lots of new equipment. $\endgroup$
    – fooot
    Commented May 17, 2018 at 19:41
  • $\begingroup$ Well, being a hardware engineer, I was looking at from the hardware perspective. I just had new hardware put in my airplane (solid state gyros, GPS/Nav/Com, Transponder, Engine Monitor). And today the software was updated in the gyros and GPS/Nav/Com, which I never had hardware before that could be updated like that. $\endgroup$
    – CrossRoads
    Commented May 18, 2018 at 21:30
  • $\begingroup$ Even software doesn't get updated that often (Databases like maps are a different animal) For example, avionics company A might only put out a software update from 6 months to 2 years, depending on the product. $\endgroup$ Commented May 19, 2018 at 19:50

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