The AIM tells you that ATC assigns speeds in terms of IAS.

It also tells you that the speed for procedure turns is in terms of IAS.

Although Part 97 and the AIM are silent on whether Approach Categories
are IAS, TAS, or ground speed, how could they possibly be anything other
than IAS?

What about the speed limits on STAR charts?

wrote:


Thanks b. For lurkers, the Jepp chart does indeed say "at 200 kt".
The reference that I was looking for is the FAR or AIM that tells the
pilots whether the charted speed is supposed to be TAS, GS, or IAS. I
realize the notam clarifies that it is IAS, but without it, how does a
pilot know? Stan