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Phl approach controller cleared a B733 to 13000 ft, but forgot he had DH8 on the same course and cleared to the same altitude. Loss of separation occurred.
| Attributes | |
| ACN | 592367 |
| Time | |
| Date | 200308 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : ptw.vortac |
| State Reference | PA |
| Altitude | msl bound lower : 12000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : phl.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : phl.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : vacating altitude cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : developmental pilot : instrument |
| Experience | controller radar : 8 controller time certified in position1 : 0.25 flight time total : 850 |
| ASRS Report | 592367 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued advisory |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 19500 vertical : 600 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I climbed DH8 to 12000 ft, then reissued 13000 ft, 10 mi in trail I climbed to 13000 ft. I thought the DH8 was climbing to 12000 ft. I tried to turn the B737, but I xferred communication. I also issued traffic to the B737 about the DH8, who (B737) had in sight.
Original NASA ASRS Text
Title: PHL APCH CTLR CLRED A B733 TO 13000 FT, BUT FORGOT HE HAD DH8 ON THE SAME COURSE AND CLRED TO THE SAME ALT. LOSS OF SEPARATION OCCURRED.
Narrative: I CLBED DH8 TO 12000 FT, THEN REISSUED 13000 FT, 10 MI IN TRAIL I CLBED TO 13000 FT. I THOUGHT THE DH8 WAS CLBING TO 12000 FT. I TRIED TO TURN THE B737, BUT I XFERRED COM. I ALSO ISSUED TFC TO THE B737 ABOUT THE DH8, WHO (B737) HAD IN SIGHT.
Data retrieved from NASA's ASRS site as of July 2007 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.