"Greg Esres" wrote in message
...
A student has an Archer II that has a red arc painted on the glass of
the tach between 2150 and 2350 RPM. The POH makes no mention of a red
arc.

I'm thinking that either the tach came out of an Arrow (which has a
red arc in this range) or some A&P confused the Archer with an Arrow
and painted it on.

I'm surprised the arc is red (prohibited), it should be yellow (caution) to
warn against continuous operation in that rpm range.

It's pretty hard to accelerate from idle to max rpm, without passing through
the range that is red arced on the tach.