lordsummerisle
I have no reason to disagree with 1 unit per hour as a reasonable rule of thumb, but it's risky to rely on it because it is only a rule of thumb, and because it's not always easy to identify the total number of units consumed over a period.
The suggestion of 5 units max before the 8 hour 'cut-off' with which pilots are familiar was errs on the side of caution. People
might be OK with more but, since the aviation limit is zero or virtually zero (depending upon the relevant country), it's unwise to take the chance.
eg If a pilot upsets someone in the hotel bar, or an airport security guard or some member of the crew etc, and they decide for their own ulterior motives to report a 'suspicion', that wouldn't be a good time to find out that the rule of thumb to which the pilot has conscientiously adhered isn't actually 100% reliable.
Or if a pilot finds himself being breath-tested in these ludicrous circumstances:
Link
737319320321
So In my opinion, by reading all these threads, most of the flight deck think its ok to fly a plane over the limit?
Who?
.