Narrative:

Z time: XX30Z frequency/altitude: 118.7/11000 ft MSL. ATC facility: mvd tower. Location: mvd. Flying VOR/DME runway 6 to mvd in moderate turbulence and rain. I started a descent after seeing ADF needle fluctuate and broke out below the ceiling. Captain noticed the ADF still pointed ahead, so I started to climb. Saw runway as I climbed, so flew normal visual approach and landing. Turbulence, a big crab angle and loud rain noise led to my error. I will be sure to wait for full swing on the ADF needle on future approachs.

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Original NASA ASRS Text

Title: B767 DSNDING INTO MVD, FO, MAKES PREMATURE DSCNT BECAUSE THE FLC BELIEVES THE ADF NEEDLE SHOWED STATION PASSAGE WHEN IT DID NOT. FORTUNATELY FOR THE FLC THE WX CLRED ENOUGH THEY WERE ABLE TO SEE THE RWY.

Narrative: Z TIME: XX30Z FREQ/ALT: 118.7/11000 FT MSL. ATC FACILITY: MVD TWR. LOCATION: MVD. FLYING VOR/DME RWY 6 TO MVD IN MODERATE TURB AND RAIN. I STARTED A DSCNT AFTER SEEING ADF NEEDLE FLUCTUATE AND BROKE OUT BELOW THE CEILING. CAPT NOTICED THE ADF STILL POINTED AHEAD, SO I STARTED TO CLB. SAW RWY AS I CLBED, SO FLEW NORMAL VISUAL APCH AND LNDG. TURB, A BIG CRAB ANGLE AND LOUD RAIN NOISE LED TO MY ERROR. I WILL BE SURE TO WAIT FOR FULL SWING ON THE ADF NEEDLE ON FUTURE APCHS.

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.