"John Galban" wrote in message oups.com...

Seth Masia schrieb:

I trained in and flew 172s for years out of an airport with a field
elevation of 5900 feet. No one on the field ever heard of this placard; no
one ever operated the planes on any fuel setting other than "both" (though
we filled the tanks with the selector on a single tank to prevent
cross-flow); and I don't recall anyone ever having a fuel starvation
problem.

Maybe it's the notorious Arkansas Triangle?


The placard was found on early model 172s and was there by AD. My
old '59 172 had it. I believe the problem was eventually solved with a
vented fuel cap on the left tank. I don't know if that terminated the
AD or not. My 172 had both the placard and the newer style vented cap
on the left tank.

John Galban=====N4BQ (PA28-180)


Just checked the C-172A fuel selector, and sure enough it says to select a single tank for operation when cruising at
and above 5000'. It also has vented caps on both tanks...