Citation Excel (C560XL)
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 125; Flight Crew Total 11600; Flight Crew Type 500
Confusion
Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Became Reoriented
Human Factors
The First Officer had asked me to take the communication radio responsibilities while he listened to the AWOS advisory. I listened in; and heard; I thought; an altimeter setting of 29.96' Hg; and set that into the standby altimeter. We had descended to 4;600 FT MSL; and shortly after level off were warned of a low altitude alert by Approach. We checked our altimeters to see a 'solid' 4;600 FT and queried the Controller about the altimeter setting. He said it was 29.76' Hg; and that we showed at somewhere around 4;200 FT MSL; I believe. We reset the altimeters to 29.76' Hg and climbed the couple of hundred feet back to 4;600 FT MSL. Then we re-tuned the AWOS to listen again to find that the actual setting was 29.76' Hg. I had miss-heard the setting; and set the incorrect setting into the standby altimeter.
C560XL Captain reported setting the wrong altimeter setting on approach which resulted in an altitude deviation.