I know of a training flight that got into class B without clearance. The instructor and student had just departed an airport and then got flight following, but in the time between the tower and approach frequency change got into the Bravo. The controller tersely "suggested" they leave the bravo. Nothing of violation or phone numbers to call over the radio was mentioned.
Are they in the clear? Or does the controller use the tail number and the FAA N number registry to look up folks and send them a letter? I have heard the tower ask for people to call them and I have heard the words pilot deviation over the radio before. In this case neither occurred- but are they in the clear? A NASA report was filed.
2014 FAA original certificates; Student-49,261 Private-17,795 Commercial-9,803 ATP-7,749 CFI-4,987
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80% chance you'll never hear about it, but the NASA form should protect you from certificate action since it was an honest mistake.
Note that ASRS will save your certificate, but will NOT prevent a violation from being entered in your record. However, when a NASA form has been submitted the FAA may not bother with the investigation/violation process since they know they can't punish you. But that's a for-sure thing.
Maybe why it was something "new" at our facility (ZOA) around 1990. Little cards were made with a magnetic back, and stuck to the metal equipment with the "new" phraseology.
Maybe new phrasing for an older concept? My reference to the 1987 case comes from a later case; it just talks about the 1987 case in terms of failure to give "a" deviation notice - it could have been talking about it in another context or before the language was standardized.