PC-12
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Commercial; Flight Crew Flight Instructor
Flight Crew Last 90 Days 200; Flight Crew Total 1700; Flight Crew Type 200
Situational Awareness
Conflict Airborne Conflict; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Returned To Clearance; Flight Crew Became Reoriented
Human Factors
[We were] issued a clearance to descend and maintain 13000 ft. We began descent with autopilot engaged and failed to set the appropriate altimeter setting. The autopilot captured normally; however our altimeter setting was set to 30.43; instead of the 29.98 for the destination airport. This put us vertically in conflict with another aircraft as we were now almost 500 ft lower than we would have been. After discussing the event with my First Officer I determined that we should have set the appropriate setting immediately; instead of waiting for the new automated weather to update. It was due to update any minute. We should have asked for the updated setting instead of waiting.
PC-12 Captain reported an airborne conflict resulted from an altitude deviation related to improper altimeter setting.