Larry Dighera wrote

On Wed, 22 Aug 2007 07:36:51 -0400, Ron Natalie
wrote in :

A visual indicator by itself, by the way, doesn't qualify.

Where does it say that?

The PA28-235 is equipped with only a red panel light.

(b) The stall warning may be furnished either through the inherent
aerodynamic qualities of the airplane or by a device that will give clearly
distinguishable indications under expected conditions of flight. However, a
visual stall warning device that requires the attention of the crew within
the cockpit is not acceptable by itself.

Bob Moore