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Center controller reported that an aircraft declaring minimum fuel departed his assigned altitude without notification resulting in a conflict with another aircraft.
| Attributes | |
| ACN | 1488002 |
| Time | |
| Date | 201710 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Medium Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute Instructor |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 6 |
| Events | |
| Anomaly | Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter Fuel Issue |
| Miss Distance | Horizontal 15000 Vertical 300 |
Narrative:
Aircraft Y (FL270) was above aircraft X (FL250). Aircraft Y keyed up and said he was declaring a fuel [shortage] and would like to divert to ZZZ. My trainee keyed up and assigned heading 080 vectors for descent. I did not like that heading so I reassigned heading 110. Aircraft Y read that back; then we proceeded to gather more info. The next update; aircraft Y had descended to FL262 and the next update we lost separation. He was not assigned a descent; nor did he report out of FL270. As soon as we noticed the altitude change; I advised aircraft X of the traffic who at this point was diverging and not a factor. I believe the closest the two aircraft got was 300 feet and 3 miles diverging.pilot needs to be more informed on what he is responsible to say if he needs an altitude change; or decides he needs to change altitude without assignment.
Original NASA ASRS Text
Title: Center Controller reported that an aircraft declaring Minimum Fuel departed his assigned altitude without notification resulting in a conflict with another aircraft.
Narrative: Aircraft Y (FL270) was above Aircraft X (FL250). Aircraft Y keyed up and said he was declaring a fuel [shortage] and would like to divert to ZZZ. My Trainee keyed up and assigned heading 080 vectors for descent. I did not like that heading so I reassigned heading 110. Aircraft Y read that back; then we proceeded to gather more info. The next update; Aircraft Y had descended to FL262 and the next update we lost separation. He was not assigned a descent; nor did he report out of FL270. As soon as we noticed the altitude change; I advised Aircraft X of the traffic who at this point was diverging and not a factor. I believe the closest the two aircraft got was 300 feet and 3 miles diverging.Pilot needs to be more informed on what he is responsible to say if he needs an altitude change; or decides he needs to change altitude without assignment.
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.