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Less than standard separation between LR35 and SF34 while on descent vectors to the airport for different runways. Operational error.
| Attributes | |
| ACN | 334292 |
| Time | |
| Date | 199604 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : pwm |
| State Reference | ME |
| Altitude | msl bound lower : 2000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pwm |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise other descent : approach descent other |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340A |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 334292 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
LR35 inbound for runway 29L downwind, SF34 inbound for runway 36L downwind. LR35 extended further than expected. Observing this, I stopped SF34 descent to 3000 ft. LR35 was descending out of 2700 ft plus or minus at the time. Turned SF34 40 degrees right away from LR35. Pilot acknowledged the turn, but track appeared to continue northbound. Called traffic at 3 mi with 1000 ft separation. I don't believe this was an error. Management does, as conflict alert went off showing 500 ft or 600 ft separation. I believe conflict alert reported incorrectly. Unsure whether this SF34 was TCASII equipped. I suspect it was. Pilot did not report an RA, possibly supporting my position of no loss of separation. This facility has experienced data block and altitude problems before. I have been (2 months or so) preoccupied with the behavior of management at our facility, and concerned that my employment could be in jeopardy. I believe that if I had not been preoccupied by management personnel policies, the situation would not have developed. I also believe that I would have ensured separation rather than provided separation by luck. Fix ASR9 ARTS to display only correct data.
Original NASA ASRS Text
Title: LTSS BTWN LR35 AND SF34 WHILE ON DSCNT VECTORS TO THE ARPT FOR DIFFERENT RWYS. OPERROR.
Narrative: LR35 INBOUND FOR RWY 29L DOWNWIND, SF34 INBOUND FOR RWY 36L DOWNWIND. LR35 EXTENDED FURTHER THAN EXPECTED. OBSERVING THIS, I STOPPED SF34 DSCNT TO 3000 FT. LR35 WAS DSNDING OUT OF 2700 FT PLUS OR MINUS AT THE TIME. TURNED SF34 40 DEGS RIGHT AWAY FROM LR35. PLT ACKNOWLEDGED THE TURN, BUT TRACK APPEARED TO CONTINUE NBOUND. CALLED TFC AT 3 MI WITH 1000 FT SEPARATION. I DON'T BELIEVE THIS WAS AN ERROR. MGMNT DOES, AS CONFLICT ALERT WENT OFF SHOWING 500 FT OR 600 FT SEPARATION. I BELIEVE CONFLICT ALERT RPTED INCORRECTLY. UNSURE WHETHER THIS SF34 WAS TCASII EQUIPPED. I SUSPECT IT WAS. PLT DID NOT RPT AN RA, POSSIBLY SUPPORTING MY POS OF NO LOSS OF SEPARATION. THIS FACILITY HAS EXPERIENCED DATA BLOCK AND ALT PROBS BEFORE. I HAVE BEEN (2 MONTHS OR SO) PREOCCUPIED WITH THE BEHAVIOR OF MGMNT AT OUR FACILITY, AND CONCERNED THAT MY EMPLOYMENT COULD BE IN JEOPARDY. I BELIEVE THAT IF I HAD NOT BEEN PREOCCUPIED BY MGMNT PERSONNEL POLICIES, THE SIT WOULD NOT HAVE DEVELOPED. I ALSO BELIEVE THAT I WOULD HAVE ENSURED SEPARATION RATHER THAN PROVIDED SEPARATION BY LUCK. FIX ASR9 ARTS TO DISPLAY ONLY CORRECT DATA.
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.