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Phl controller experienced near loss of separation at 8000 when aircraft was descended through occupied altitude; TCAS RA saved legal separation.
| Attributes | |
| ACN | 735844 |
| Time | |
| Date | 200704 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : phl.airport |
| State Reference | PA |
| Altitude | msl single value : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | tracon : phl.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : phl.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Citation X |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : developmental |
| ASRS Report | 739844 |
| Events | |
| Anomaly | conflict : airborne critical |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert flight crew : took evasive action |
| Miss Distance | vertical : 1000 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
B737 was on a 070 degree heading at 8000 ft. CIT10 was sbound landing ilg at 7000 ft. B737 was instructed to descend to 6000 ft. I noticed B737 could conflict with CIT10 so I issued B737 a turn to the left to establish course divergence. He advised me he was responding to an RA. B737 climbed back up to 8000 ft and I turned him eastbound.
Original NASA ASRS Text
Title: PHL CTLR EXPERIENCED NEAR LOSS OF SEPARATION AT 8000 WHEN ACFT WAS DESCENDED THROUGH OCCUPIED ALT; TCAS RA SAVED LEGAL SEPARATION.
Narrative: B737 WAS ON A 070 DEG HDG AT 8000 FT. CIT10 WAS SBOUND LNDG ILG AT 7000 FT. B737 WAS INSTRUCTED TO DSND TO 6000 FT. I NOTICED B737 COULD CONFLICT WITH CIT10 SO I ISSUED B737 A TURN TO THE L TO ESTABLISH COURSE DIVERGENCE. HE ADVISED ME HE WAS RESPONDING TO AN RA. B737 CLBED BACK UP TO 8000 FT AND I TURNED HIM EBOUND.
Data retrieved from NASA's ASRS site as of January 2009 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.