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How does one keep track of 168 hours looking forward and back?
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Ah, the same way you keep track of 7 days under the old rule?
Not true, 168 hrs is not the same as 7 calendar days. While 7 days may be as much as 168 hrs, it can be a much as 169 hrs if you have a DST to STD transition. Also with the old rules the clock starts only at midnight, so if you have a flight that ends at 13:00 the old 30 in 7 rule would only need to look back 157 hrs, with the new rule it is always a consistent 168 hr lookback.
Instead of 30 hrs block in 7 you could be limited by 60 hrs of FDP in 168.
With respect to the weekly rest, under 121 it was 24 in 7, a full consecutive 24 hrs free of duty must be able to be found, now under 117 the new rule is 30 in 168, look back from the start of any FDP (or reserve) 168 hrs, you must be able to find a 30 hour rest period within the 168 hrs, an easier way is to see when the last 30 hour rest period ended, if it is more than 138 hrs to the start of the FDP, you can't go. (138 = 168 - 30).
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