Originally Posted by
Baradium
Part 117.25(E)
Bolded for emphasis.
While the rest period must be immediately prior to the reserve or flight duty period and must contain a minimum of 8 hours sleep opportunity the measurement is done from release from your previous duty period. Nowhere does it say that only the previous 10 hours are considered. What is says is that the period must be AT LEAST 10 hours and have the 8 hours sleep opportunity. The 8 hours can be anywhere in the rest period and there is no limit to how long the rest period can be.
That is written to establish a 10 hour minimum. If you have more than 10, then the only portion effecting you is the part about 10/8 immediately prior to the new FDP. You can have more rest measured from when duty ended, you just can’t have less than 10 measured from when duty ended.
If you do have more, it’s the 10/8 immediately prior to the new FDP that counts. This is clear, even in the interpretations cited elsewhere in this thread.