Narrative:

Possible legality problem of the destination forecast WX due to the accidental use of RVR minimum visibility at vsss instead of forecast visibility applied to non RVR minimum for runway 36 at shanghai. I looked at the runway 36 ILS approach plate at shanghai and determined that the minimum visibility is 550 meters RVR or 800 meters visibility. The forecast for the destination contained conditional wording: 'ocnl 700 meters.' my company's flight operations manual states that we are not permitted to substitute RVR minimum for forecast minimums. But this was overlooked by accident by me. I was positive that fog was doubtful as ETA was approximately 2 hours after sunrise with 15 KTS wind. Actual arrival WX reported as greater than 10 KM wind 040/15 KTS, 7 meters per second.

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Original NASA ASRS Text

Title: DC10-30F ACFT RPTR CAPT BASED DEP TO DEST WX ON RVR MINIMUMS RATHER THAN FORECAST MINIMUMS. RPTR'S FLT OPS MANUAL DOESN'T PERMIT THE SUBSTITUTION, BUT RPTR DISCOVERED IT AFTER THE FACT.

Narrative: POSSIBLE LEGALITY PROB OF THE DEST FORECAST WX DUE TO THE ACCIDENTAL USE OF RVR MINIMUM VISIBILITY AT VSSS INSTEAD OF FORECAST VISIBILITY APPLIED TO NON RVR MINIMUM FOR RWY 36 AT SHANGHAI. I LOOKED AT THE RWY 36 ILS APCH PLATE AT SHANGHAI AND DETERMINED THAT THE MINIMUM VISIBILITY IS 550 METERS RVR OR 800 METERS VISIBILITY. THE FORECAST FOR THE DEST CONTAINED CONDITIONAL WORDING: 'OCNL 700 METERS.' MY COMPANY'S FLT OPS MANUAL STATES THAT WE ARE NOT PERMITTED TO SUBSTITUTE RVR MINIMUM FOR FORECAST MINIMUMS. BUT THIS WAS OVERLOOKED BY ACCIDENT BY ME. I WAS POSITIVE THAT FOG WAS DOUBTFUL AS ETA WAS APPROX 2 HRS AFTER SUNRISE WITH 15 KTS WIND. ACTUAL ARR WX RPTED AS GREATER THAN 10 KM WIND 040/15 KTS, 7 METERS PER SECOND.

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.