On Fri, 05 Oct 2007 18:38:09 -0000, wrote:

On Oct 6, 4:25 am, "karl gruber" wrote:
On many Cessna 172s you are REQUIRED to run on either left or right (not
both) above 5000'

Karlhttp://www.caa.is/datadir/bsdata/img/adnotes/72-07-02.pdf


Many cessna 172's? How many were not modified -I've not seen the
required placard...

The modification was to add a new vent line. I don't know any on the
flight lines I have access to that weren't done. They also all
complied with AD79-10-14R1 (new vented fuel caps) at the same time.