I had to go to the books to refresh:
Chapter 26. Alert Areas
Section 1. General
26-1-1. DEFINITION
An alert area is airspace wherein a high volume of pilot training or an unusual type of aeronautical activity is conducted.
26-1-2. PURPOSE
Alert areas are designated to inform nonparticipating pilots of areas that contain a high volume of pilot training operations, or an unusual type of aeronautical activity, that they might not otherwise expect to encounter. Pilots are advised to be particularly alert when flying in these areas.
26-1-3. LOCATION
Alert areas must not extend into Class A, B, C, and D airspace, or Class E airport surface areas. To the extent possible, alert areas should avoid Federal airways, major terminal areas, and high volume VFR routes. Once an alert area is designated, the establishment of Federal airways through such areas should be kept to a minimum.
26-1-4. ACTIVITIES
a. Only those activities that do not pose a hazard to other aircraft may be conducted in an alert area.
b. All alert area activities must be conducted in accordance with visual flight rules, and in compliance with applicable Sections of 14 CFR.
c. Flight Service Stations may broadcast information regarding alert area activities as circumstances dictate.
26-1-5. IDENTIFICATION
Alert areas must be identified by the letter “A" prefix followed by a dash, a two or three digit number, a location, and the two-letter state abbreviation (e.g., A-292, Pensacola, FL). A letter suffix is used to indicate subdivisions. Identification numbers are assigned by Airspace Regulations and ATC Procedures Group. Aeronautical charts must be annotated to reflect the type of activity conducted in the alert area.
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I guess, by some stretch, the fact that he wasn't monitoring one of the alert freqs put him in 'violation' of 14CFR according to 26-1-4b? Although I can't for the life of me figure out where in 14CFR there's anything about requiring a radio to be on or anything. I also realized when I traced out A-381 that I operate in there on the far western edge without monitoring any of the freqs quite often. Hmmmm, another 'violation' I've racked up without knowing it.
Violation is whatever they say it is. Guessing the cost for the intercept to be around $40,000 or so? Well, thank goodness they saved the country from a -- Piper ASEL....
<edit: Be alert. The world needs more lerts.>