Gulfstream G100/G150 (IAI 1125 Astra)
Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 300; Flight Crew Total 4000; Flight Crew Type 3000
Communication Breakdown; Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued Advisory / Alert; Flight Crew Became Reoriented; Flight Crew Returned To Clearance; Flight Crew Took Evasive Action
Human Factors
We were coming in on the initial ILS approach for runway 31 into RST. My first officer wrote down the incorrect altimeter setting due to hard to understand weather read out on frequency. Current altimeter setting was 29.21; he relayed 30.21 for our settings which put us 1;000 feet below assigned altitude. We broke out and I initiated a climb and asked for current altimeter at the field from approach control. They said low altitude alert; and gave me current altimeter setting. We continued the approach and landed safely. It was a CRM mistake; because my first officer didn't tell me he couldn't fully understand the weather. That way I could have helped listen for clarification on the correct setting.
Business jet Captain reports descending to the final approach fix altitude at RST using the wrong altimeter setting; resulting in being 1;000 feet low. ATC is queried and the correct altimeter setting is provided along with a low altitude alert.