Stu Gotts wrote:

Because if you call the FAA they'll tell you they need certification,

That's not true. There are several battery-powered clocks which are not "certified"
that directly replace the old windup models. The only time certification issues come
into play is if you tie into the aircraft electrical system. Even that may not be
true in all FSDOs (but it is with the clowns at Teterboro).

George Patterson
None of us is as dumb as all of us.