"Tony Cox" wrote in message
nk.net...
Well, I'd certainly want to know why a gauge was flicking
around, but being pedantic (as I would be if called on it
by the FAA), how am I to know if my gauges are operational?

Per the FAR, if they show the amount of fuel in the tank, they are
operational. If they don't, they aren't. It's not rocket science. If you
have gauges that show full tanks even when they are only 1/4 full, the
gauges are not in compliance with the relevant regulation.

For that, I'd go to my POH for guidance. My POH tells me
that my fuel gauges should read 'red line' when there is no
fuel in the tank. It says nothing else.

Just because the POH only describes your "red line" for the zero fuel point,
that doesn't mean there aren't additional requirements for accuracy.

Pete