Thanks Kap,
fliion,
Chk Airman
It's 100 hours in a rolling 28 days.
So you can start a 17 hour 1 leg sector on the 28th day if your look back 28 days was 99.9 hours.
If it's 100.1 you can't do the flight.
That seems a lot like the old part 121 rule of "legal to start, legal to finish"
On the west coast of the Atlantic, at no point in time should you be able to look back and count 100hrs of flight time.
In your example, our software starts at the END of the flight, and looks back 672hrs to ensure that you don't exceed the limit. That way, you could never legally start that 17hr leg.
I hope that important regulatory distinction makes it into your rulebooks. 100 hrs with 10 days off every month cannot be safe!