Narrative:

After experiencing a very restless reduced rest (8.0 hours) overnight at gulfport, ms, we arrived to find the airport visibility about 0 and the tower reporting 700 RVR. Being extremely tired I consulted our standard practice to attempt to determine the min RVR needed to depart to atl. I misread the sp and determined that we only needed 600 RVR to depart. When we departed the RVR was 1000. En route to atl the first officer and myself discussed the RVR as required by our standard practice manual. Upon further consultation with the sp, I discovered that we needed 1600 RVR to depart. Another reason to increase the min rest required on overnights. Supplemental information from acn 192176. We (the crew) were operating on 8 hours reduced rest. While I was waiting on captain I listened to the ATIS and they said ceiling 0 visibility 0, I thought we would be there for a while. The captain arrived and much to my surprise he said we would be departing shortly. He at this time, referenced our standard practice manual and stated we would need 600 ft RVR to depart. I thought this sounded low but I did not question it at the time. When we were cleared for takeoff the tower controller said 1000 RVR cleared for takeoff. I again thought we did not have enough RVR but did not say anything because before engine start I asked the captain how much RVR was needed to depart and he said 600 and told me where to look it up in the standard practice. Since I saw him looking it up I thought it was not necessary to challenge him on it. When we were in cruise flight on the way home I decided to look it up. I saw we had made a mistake and showed it to him. He agreed. 3 things could have helped prevent this. 1. More rest. 2. My being more assertive. 3. Better crew coordination.

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Original NASA ASRS Text

Title: COMMUTER FLC DEPARTS BELOW MINS.

Narrative: AFTER EXPERIENCING A VERY RESTLESS REDUCED REST (8.0 HRS) OVERNIGHT AT GULFPORT, MS, WE ARRIVED TO FIND THE ARPT VISIBILITY ABOUT 0 AND THE TWR RPTING 700 RVR. BEING EXTREMELY TIRED I CONSULTED OUR STANDARD PRACTICE TO ATTEMPT TO DETERMINE THE MIN RVR NEEDED TO DEPART TO ATL. I MISREAD THE SP AND DETERMINED THAT WE ONLY NEEDED 600 RVR TO DEPART. WHEN WE DEPARTED THE RVR WAS 1000. ENRTE TO ATL THE FO AND MYSELF DISCUSSED THE RVR AS REQUIRED BY OUR STANDARD PRACTICE MANUAL. UPON FURTHER CONSULTATION WITH THE SP, I DISCOVERED THAT WE NEEDED 1600 RVR TO DEPART. ANOTHER REASON TO INCREASE THE MIN REST REQUIRED ON OVERNIGHTS. SUPPLEMENTAL INFO FROM ACN 192176. WE (THE CREW) WERE OPERATING ON 8 HRS REDUCED REST. WHILE I WAS WAITING ON CAPT I LISTENED TO THE ATIS AND THEY SAID CEILING 0 VISIBILITY 0, I THOUGHT WE WOULD BE THERE FOR A WHILE. THE CAPT ARRIVED AND MUCH TO MY SURPRISE HE SAID WE WOULD BE DEPARTING SHORTLY. HE AT THIS TIME, REFERENCED OUR STANDARD PRACTICE MANUAL AND STATED WE WOULD NEED 600 FT RVR TO DEPART. I THOUGHT THIS SOUNDED LOW BUT I DID NOT QUESTION IT AT THE TIME. WHEN WE WERE CLRED FOR TKOF THE TWR CTLR SAID 1000 RVR CLRED FOR TKOF. I AGAIN THOUGHT WE DID NOT HAVE ENOUGH RVR BUT DID NOT SAY ANYTHING BECAUSE BEFORE ENG START I ASKED THE CAPT HOW MUCH RVR WAS NEEDED TO DEPART AND HE SAID 600 AND TOLD ME WHERE TO LOOK IT UP IN THE STANDARD PRACTICE. SINCE I SAW HIM LOOKING IT UP I THOUGHT IT WAS NOT NECESSARY TO CHALLENGE HIM ON IT. WHEN WE WERE IN CRUISE FLT ON THE WAY HOME I DECIDED TO LOOK IT UP. I SAW WE HAD MADE A MISTAKE AND SHOWED IT TO HIM. HE AGREED. 3 THINGS COULD HAVE HELPED PREVENT THIS. 1. MORE REST. 2. MY BEING MORE ASSERTIVE. 3. BETTER CREW COORD.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.