Don’t Ignore Service Bulletins

One of the biggest gotchas with major upgrades-and it doesn't matter if it's avionics retrofits or airframe and engine mods-is not keeping the system current with the latest software and hardware mods. These may come in the way of service bulletins, software bulletins and service letters. At the least, you may not be taking advantage of a system or its interface to its fullest, but more serious is doing nothing, potentially leaving you vulnerable to an inflight failure. That's what FAA ADs are for, of course, but they (sometimes, not always) don't always occur until something crashes or comes close to crashing.
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