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Phl controller reports of loss of separation between two aircraft under his control. Use of anticipated separation was a factor. He then reports of a second incident involving a third aircraft where speed control and vectoring play a part in another conflict.
| Attributes | |
| ACN | 1191273 |
| Time | |
| Date | 201407 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | PHL.Airport |
| State Reference | PA |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Medium Large Transport |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Climb |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Medium Transport High Wing 2 Turboprop Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Climb |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Departure |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 10 |
| Person 2 | |
| Function | Departure |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 10 |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Clearance Deviation - Speed All Types |
Narrative:
Aircraft X was level climbing to 9;000 ft direct ptw in front of aircraft Y about 5 miles. Aircraft Y was out of 10;000 ft climbing to 13;000 ft. When aircraft Y vacated 11;000 ft; I climbed aircraft X to 11;000 ft. After about a minute or two I noticed that aircraft Y stopped his climb at 11;400 ft. It appeared that the aircraft Y stayed at 11;400 for about a minute before starting his climb again. I had already switched aircraft Y to ZNY center; so I could not ask him to expedite his climb. When I noticed aircraft Y leveling off at 11;400; I noticed aircraft X vacating 10;000 ft. I advised aircraft X to stop his climb at 10;400 ft. The pilot acknowledged and read back maintain 10;400 ft. It appeared that aircraft X climbed to 10;600 ft before descending back to 10;400 ft. After calling the ZNY ptw sector to ask if they knew why aircraft Y stopped his climb; they replied they didn't know; he checked on and said he was climbing to 13;000 ft. It seemed that the stop climb from aircraft Y at 11;400 was a direct result of the possible loss of separation.
Original NASA ASRS Text
Title: PHL Controller reports of loss of separation between two aircraft under his control. Use of anticipated separation was a factor. He then reports of a second incident involving a third aircraft where speed control and vectoring play a part in another conflict.
Narrative: Aircraft X was level climbing to 9;000 FT direct PTW in front of Aircraft Y about 5 miles. Aircraft Y was out of 10;000 FT climbing to 13;000 FT. When Aircraft Y vacated 11;000 FT; I climbed Aircraft X to 11;000 FT. After about a minute or two I noticed that Aircraft Y stopped his climb at 11;400 FT. It appeared that the Aircraft Y stayed at 11;400 for about a minute before starting his climb again. I had already switched Aircraft Y to ZNY Center; so I could not ask him to expedite his climb. When I noticed Aircraft Y leveling off at 11;400; I noticed Aircraft X vacating 10;000 FT. I advised Aircraft X to stop his climb at 10;400 FT. The pilot acknowledged and read back maintain 10;400 FT. It appeared that Aircraft X climbed to 10;600 FT before descending back to 10;400 FT. After calling the ZNY PTW Sector to ask if they knew why Aircraft Y stopped his climb; they replied they didn't know; he checked on and said he was climbing to 13;000 FT. It seemed that the stop climb from Aircraft Y at 11;400 was a direct result of the possible loss of separation.
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.