Narrative:

Busy clear morning. Filed IFR. Vectored around VFR traffic. Had to request descent from 3;000 feet to 2;400 feet to avoid traffic that passed over at less than 500 feet. Winds were changing and originally requested RNAV X with calm winds. Winds changed to 310 so requested RNAV xx. Winds continued to change to 330 and departing traffic was using yy. I was cleared to FAF and was doing an autopilot coupled approach which was fine until turning final when the needles were not centering and I was south of the final approach course. I was monitoring CTAF. Traffic announced departure on yy turning east. I was coming in from the east which increased the anxiety along with continuous chop. At that point ATC called and canceled radar coverage which has never happened in all the times I have flown into ZZZ. Controllers were very busy on this clear VFR day. Upon hearing the cancellation I switched to CTAF at ZZZ and hand flew the approach while communicating with the outbound traffic departing on yy. Later that day I flew back to ZZZ1 and did the RNAV xy and the needles were centered with no problems. When I got home I had a message from TRACON to call. I called and was told that I didn't cancel my IFR flight plan going into ZZZ. We discussed the situation and they reinforced that controllers cannot cancel flight plans; only pilots can. I apologized for the inconvenience that I caused through my own confusion. It was a very valuable learning experience and accentuates the compounding of factors that lead to errors being made.

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Original NASA ASRS Text

Title: Bonanza pilot reported neglecting to cancel IFR flight plan due to distractions on approach to a non-towered airport.

Narrative: Busy clear morning. Filed IFR. Vectored around VFR traffic. Had to request descent from 3;000 feet to 2;400 feet to avoid traffic that passed over at less than 500 feet. Winds were changing and originally requested RNAV X with calm winds. Winds changed to 310 so requested RNAV XX. Winds continued to change to 330 and departing traffic was using YY. I was cleared to FAF and was doing an autopilot coupled approach which was fine until turning final when the needles were not centering and I was south of the final approach course. I was monitoring CTAF. Traffic announced departure on YY turning east. I was coming in from the east which increased the anxiety along with continuous chop. At that point ATC called and canceled radar coverage which has never happened in all the times I have flown into ZZZ. Controllers were very busy on this clear VFR day. Upon hearing the cancellation I switched to CTAF at ZZZ and hand flew the approach while communicating with the outbound traffic departing on YY. Later that day I flew back to ZZZ1 and did the RNAV XY and the needles were centered with no problems. When I got home I had a message from TRACON to call. I called and was told that I didn't cancel my IFR flight plan going into ZZZ. We discussed the situation and they reinforced that controllers cannot cancel flight plans; only pilots can. I apologized for the inconvenience that I caused through my own confusion. It was a very valuable learning experience and accentuates the compounding of factors that lead to errors being made.

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.