What are the FCC or FAA regulations that require one to use their full registration as radio callsign, unless abridged by air traffic control, when using an aircraft radio for transmitting? It seems it is becoming popular to use type of aircraft and color only for transmitting.
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$\begingroup$ Note that the callsign does not necessarily have to be the registration. For general aviation it usually is, but commercial operations normally use the operator name and flight number. (“blue cessna” is never a valid callsign though). $\endgroup$– Jan HudecSep 16, 2017 at 16:15
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$\begingroup$ @JanHudec "blue Cessna" is a fairly common call sign when flying the Ripon arrival into KOSH for Airventure. The caveat is ATC talks to you, pilots respond by rocking their wings. You are correct though that it wouldn't be valid to call up ATC and use it as a call sign. $\endgroup$– GerrySep 17, 2017 at 0:57
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The AIM discusses communications with ATC in Chapter 4.
4−2−3. Contact Procedures a. Initial Contact. 1. The terms initial contact or initial callup means the first radio call you make to a given facility or the first call to a different controller or FSS specialist within a facility. Use the following format:
(a) Name of the facility being called; (b) Your full aircraft identification as filed in the flight plan or as discussed in paragraph 4−2−4, Aircraft Call Signs; (c) When operating on an airport surface, state your position. (d) The type of message to follow or your request if it is short; and (e) The word “Over” if required.
c. Subsequent Contacts and Responses to Callup from a Ground Facility. Use the same format as used for the initial contact except you should state your message or request with the callup in one transmission.
4−2−4. Aircraft Call Signs 2. ATC specialists may initiate abbreviated call signs of other aircraft by using the prefix and the last three digits/letters of the aircraft identification after communications are established.…The pilot may use the abbreviated call sign in subsequent contacts with the ATC specialist.
When operating at a non-towered field, many pilots have begun to identify their aircraft by type and color. I’m not sure when this started, but if you listen to popular YouTube flyers like steveo1kinevo, you will notice that when they are flying into non-towered fields, they just give the aircraft type, e.g. Caravan or TBM. From a practical standpoint, it makes a lot of sense. You can’t see the numbers but you can see the type and color. And unless there are lots of white Cessnas in the pattern, it is easy to keep track of who is where. What you want to know in the pattern is where are the other planes and how fast are they going.
Type and color gives you the necessary information. For me at least, it is easier to keep track of type and color than it is to keep track of N numbers.
