Narrative:

Aircraft X was departing hcf airspace from ceben to civit; aircraft Y was going aunti; A332 to helop with a deviation of 30 miles right of route initially. Hcf called back to coordinate 60 miles right of route for aircraft Y which probed green. Thought it was odd at the time; but the angle of deviation of routes could have played into that factor. Later hcf calls back to say aircraft Y looks like he's deviating more like 90 miles right of route even though he was only cleared 60; looking like he was a bit close to aircraft X but that aircraft Y looked like he was going back to what he was cleared. I probed 90 miles; which showed green; then I probed 126 mile to test the conflict with aircraft X. That showed red with conflict. Went back to probe 100 miles and that was green so I told hcf that it was probing good. Aircraft Y came out cleared 60 miles right of route but was probing 90 miles right of route to cover his possible deviance. There was no conflict showing till aircraft X crossed ceben. At that time it was flashing red. I thought maybe this was because he was on R463 and not A332; thus I re-cleared the aircraft Y only 50 miles right of route. I did not probe his originally cleared 60 miles right of route. Once aircraft Y accepted; the conflict was gone. I could have re-probed 60 right of route to confirm if what he was cleared was still good; but at the time of writing this; I'm not sure if it was. Also not sure why 90 right of route would not set off the conflict with aircraft X but 126 miles would. Will be more restrictive with deviations leaving hcf and separate more with altitude than route.

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Original NASA ASRS Text

Title: KZAK Controller reported that a course deviation by one aircraft resulted in an airborne conflict.

Narrative: Aircraft X was departing HCF airspace from CEBEN to CIVIT; Aircraft Y was going AUNTI; A332 to HELOP with a deviation of 30 miles right of route initially. HCF called back to coordinate 60 miles right of route for Aircraft Y which probed green. Thought it was odd at the time; but the angle of deviation of routes could have played into that factor. Later HCF calls back to say Aircraft Y looks like he's deviating more like 90 miles right of route even though he was only cleared 60; looking like he was a bit close to Aircraft X but that Aircraft Y looked like he was going back to what he was cleared. I probed 90 miles; which showed green; then I probed 126 mile to test the conflict with Aircraft X. That showed red with conflict. Went back to probe 100 miles and that was green so I told HCF that it was probing good. Aircraft Y came out cleared 60 miles right of route but was probing 90 miles right of route to cover his possible deviance. There was no conflict showing till Aircraft X crossed CEBEN. At that time it was flashing red. I thought maybe this was because he was on R463 and not A332; thus I re-cleared the Aircraft Y only 50 miles right of route. I did not probe his originally cleared 60 miles right of route. Once Aircraft Y accepted; the conflict was gone. I could have re-probed 60 right of route to confirm if what he was cleared was still good; but at the time of writing this; I'm not sure if it was. Also not sure why 90 right of route would not set off the conflict with Aircraft X but 126 miles would. Will be more restrictive with deviations leaving HCF and separate more with altitude than route.

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.