Narrative:

I was the r-side receiving a break. I had a traffic conflict with aircraft X level at FL360. Prior to completing the briefing I turned aircraft X 20 degrees right. The confliction was noted to the next controller and briefing completed. I was informed later that night that a deal was almost had with aircraft X. I was told that the aircraft was complaining about the time he was on the heading and the next controller told me at that time they appeared to turn back to the left without clearance to do so.they were then turned further to the right; and eventually cleared to FL350. They took the turn; but didn't start out of FL360 for over 50 seconds after the clearance was given. Aircraft X proceeded to go right along the minimum separation; but was never lost. After reviewing the event on falcon; it appeared the aircraft turned back to the left on their own; and didn't obey an ATC command in a timely manner. This was an unsafe situation caused by a possible pilot deviation and disregard of an ATC clearance.pilot should be reprimanded for not obeying a clearance. Our job is to separate the traffic; and if aircraft don't obey our commands we cannot effectively do our job.

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Original NASA ASRS Text

Title: ZMP Controllers reported of a pilot who did not follow ATC instructions and turned the aircraft to a different heading than what was assigned.

Narrative: I was the R-side receiving a break. I had a traffic conflict with Aircraft X level at FL360. Prior to completing the briefing I turned Aircraft X 20 degrees right. The confliction was noted to the next controller and briefing completed. I was informed later that night that a deal was almost had with Aircraft X. I was told that the aircraft was complaining about the time he was on the heading and the next controller told me at that time they appeared to turn back to the left without clearance to do so.They were then turned further to the right; and eventually cleared to FL350. They took the turn; but didn't start out of FL360 for over 50 seconds after the clearance was given. Aircraft X proceeded to go right along the minimum separation; but was never lost. After reviewing the event on Falcon; it appeared the aircraft turned back to the left on their own; and didn't obey an ATC command in a timely manner. This was an unsafe situation caused by a possible pilot deviation and disregard of an ATC clearance.Pilot should be reprimanded for not obeying a clearance. Our job is to separate the traffic; and if aircraft don't obey our commands we cannot effectively do our job.

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.