wrote in message
ps.com...
Is the tetrahedron at an airport:

1) Supposed to be pinned down to show active runway
2) Allowed to be pinned down to show active runway
3) Supposed to pivot freely with the wind direction

(Background: our club has a long-standing policy to anchor the
tetrahedron. Some of us are really scratching our heads about this
policy and would like to change it. We already know that "the
tetrahedron is not a wind indicator".)

I don't know what (if anything) the FARs say about that, but it is covered
in the AIM (Section 4-3-4) "Pilots are cautioned against using a tetrahedron
for any purpose rather than as an indicator of landing direction." Curiously,
the section seems to be silent on your specific question, but does say that a
wind tee can be manually pointed as long as it is co-located with a wind
indicator.

Thanks for an interesting topic. I learned something.

Vaughn