Narrative:

[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.

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Original NASA ASRS Text

Title: PC-12 Captain reported an airborne conflict resulted from an altitude deviation related to improper altimeter setting.

Narrative: [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.

Data retrieved from NASA's ASRS site 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.