Using other freqs to communicate between planes or ground?

Peter Duniho wrote:

The practice area (122.85) is close enought that you could, I suppose (if
you had a dilemma...), hail the FBO to ask for help.

The regulations don't say anything about 122.85 being usable as an
air-to-air frequency. Who told you that 122.85 is approved for use as the
"practice area" frequency? Is that published somewhere?

Check the AIM (I know it's "only" recommend and not regulatory, but
hey...), Chapter 4-1-11 Designated Unicom/Multicom Freq. Under 4-1-11 b)
2) you'll find "Other Frequency Usage designated by the FCC:

Air-to-air communications and private airports (not open to the public):
122,75, 122,85
Air-to-air communications (Helicopters)
123,025

Hope that helps.

Cheers,
Jens

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