"Dave Bushong" wrote:

Nearly all aircraft accidents are caused by a series of unlikely
events
all happening together, none of which by itself would be a problem.

I'll bet there's no record of a U.S. airline accident caused by faulty
navigation equipment for any reason, or at least excluding maybe the
early years. General aviation, yes.

Would you want to add one more "unlikely event" to your next
flight?

I have no problem with any airline with a flat "no" policy on this,
because things do happen even if rarely. NASA gathers the PED
incident data, and over a 14-year period, there have been less than
100 events, mostly in cruise, most not classed as potentially serious.
The reason they were reported is because the equipment told the pilot
about it, and often ATC did so too. Also, NASA has to take the
pilot's word for it that the anomaly was caused by a PED.

Fred F.