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2 IFR aircraft departing on the same SID, but different transitions, experience a potential conflict when both aircraft transgressed approximately 2 pt 5 mi off course while on parallel rtes.
| Attributes | |
| ACN | 412780 |
| Time | |
| Date | 199808 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 18000 msl bound upper : 18000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Harrier |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 8 |
| ASRS Report | 412870 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Miss Distance | horizontal : 28200 vertical : 600 |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | other |
Narrative:
Both aircraft were flying within 2 1/2 mi centerline of dall 4 departure. One on the eic transition and one on the eld transition. Their departure radials are so close in proximity that unless the aircraft are established dead center centerline, loss of separation 'will' occur again. The investigation was deemed a non occurrence.
Original NASA ASRS Text
Title: 2 IFR ACFT DEPARTING ON THE SAME SID, BUT DIFFERENT TRANSITIONS, EXPERIENCE A POTENTIAL CONFLICT WHEN BOTH ACFT TRANSGRESSED APPROX 2 PT 5 MI OFF COURSE WHILE ON PARALLEL RTES.
Narrative: BOTH ACFT WERE FLYING WITHIN 2 1/2 MI CTRLINE OF DALL 4 DEP. ONE ON THE EIC TRANSITION AND ONE ON THE ELD TRANSITION. THEIR DEP RADIALS ARE SO CLOSE IN PROX THAT UNLESS THE ACFT ARE ESTABLISHED DEAD CTR CTRLINE, LOSS OF SEPARATION 'WILL' OCCUR AGAIN. THE INVESTIGATION WAS DEEMED A NON OCCURRENCE.
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.