B737-300
Flight Crew Last 90 Days 158
Workload; Distraction; Confusion
Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Weather / Turbulence
Flight Crew Returned To Clearance; Flight Crew Became Reoriented
Human Factors; Weather
We were given a descent to 13;000 FT. There were reports of moderate turbulence in the descent and the wind at the airport was gusting to 49 KTS. We were discussing the landing conditions and turbulence. We descended through 18;000 FT. The current altimeter setting at DEN was 29.64. The Captain set 29.64 in her window and I set 30.64 in my window. I called for the Descent Checklist. In the response of 'altimeter and bugs;' I glanced at the Captain's window and saw .64 and looked at mine and saw .64 and verified crosschecked. We were experiencing moderate turbulence in the descent. I was slowing the descent down as I approached 13;000 FT. When the Captain voiced; 'Aren't we supposed to be leveling at 13;000 FT; I immediately looked at her altimeter and then looked at the ATIS sheet and realized my altimeter was set incorrectly at 30.64 instead of 29.64. I stopped the descent and climbed back up to 13;000 FT. We had in fact reached 12;100 FT. The Captain said to ATC that we had gone below our assigned altitude and were climbing back up to the correct altitude.
A B737 First Officer erroneously set his altimeter at 30.64 while the Captain correctly set 29.64 and nearing 12;000 FT realized they have overshot the clearance altitude of 13;000 FT and corrected.