FLC OF AN SF340 SETTLE FOR AN 8 HR CREW REST PERIOD WHEN CREW SCHEDULING ADVISES THEM THAT THE 8 HRS IS OK.

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THIS EVENT IS REGARDING CREW REST. ON JUL/MON/98; THE CREW HAD JUST OVER 8 HRS OF REST INSTEAD OF THE REQUIRED 9 HRS. AS A FO; I WAS WITH THE CAPT WHEN HE CALLED SCHEDULING TO INQUIRE ABOUT OUR REST REQUIREMENT. THE CAPT; FLT ATTENDANT AND I THOUGHT WE NEEDED MORE REST; THEREFORE; DELAYING THE FLT IN THE MORNING. THE SCHEDULER AT AIRLINE SAID WE WERE ALL OK WITH 8 HRS OF REST. THE NIGHT BEFORE WE ALL HAD PROPER REST. BOTH THE CREW AND THE SCHEDULING DEPT DID NOT CONSIDER THE FLT HRS DURING A 24 HR PERIOD. AS A CREW WE DID NOT INQUIRE THE SCHEDULING DEPT AFTER HE SAID 8 HRS WAS FINE. I FEEL THE REASONS WE THE CREW DID NOT CONSIDER THE SIT LONGER WAS: 1) OUR LAST FLT WAS ONLY 30 MINS IN WHICH WE CHANGED TIME ZONES. FLEW FROM CENTRAL-EASTERN-BACK TO CENTRAL. I REMEMBER CONFUSION ABOUT TIME CHANGES. 2) CALLED SCHEDULING TO CONFIRM AND WAS NOT TOLD TO TAKE MORE REST; THEREFORE CLOSING THE ISSUE TOO QUICKLY. 3) DUTY DAY WAS 14 HRS AND 12 MINS. WE WERE AVOIDING TSTMS DURING THE EVENING. FATIGUE WAS A FACTOR. LATER; FINDING OUT; AIRLINE WAS UNABLE TO CATCH THE REQUIRED CREW REST BECAUSE WX CAUSED PROBS FOR THEIR COMPUTER SYS. AS A CREW WE SHOULD HAVE BEEN MORE RESPONSIBLE TO CATCH THIS MISTAKE. AIRLINE IS FILING A DISCLOSURE ON THIS.