The Lawyer Speaks
The legal doctrine of negligence per se applies to (a) negligence claims where (b) the asserted breach of a legal duty is shown to have involved a violation of an applicable governmental regulation or (even more clearly) some regulatory law or standard. One could argue, I guess, deviation from ICAO standard words phrases, syntax, numeric convention ("point dot or decimal??" - the Internet derivative of 'coffee, tea or me?'?) and from other expressions/indications and/or manifestations of Uniformity, the Big Uniformity, constitutes such a violation. I think not. The very fact - glaringly obvious fact - that so many posting members disagree, or even quarrel, over the relevance (.....if any) of adherence to ICAO Straight Talk proves, to a legal certainty (at least to this holder of General Counsel right title and writ) that deviations from ICAO-stuff Are NOT probative, ipso facto, of negligence per se.
Less than 70 words per sentence, I thinka, and Thank You!!-!!-!! to member who earlier urged brev-it-y. WillowRun 6-3, ORD area, With You [six words, or seven?]