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An air carrier experienced a near midair collision at 3;500 ft approaching atl runway 27L. The TCAS RA alerted prior to an ATC traffic alert.
| Attributes | |
| ACN | 839492 |
| Time | |
| Date | 200906 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ATL.Airport |
| State Reference | GA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Medium Large Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain |
| Events | |
| Anomaly | Conflict NMAC |
| Miss Distance | Horizontal 0 Vertical 100 |
Narrative:
Flight was on a vector cleared to intercept 27L for a visual approach at 180 KTS and 3500 MSL. On a left base 7NM from anval we received traffic warning followed by climb climb climb instantly. I immediately initiated a climb from 3500 to 4500 and followed the vertical speed indicator until clear of conflict was heard. The target showed -200 then -100 in red directly underneath the aircraft. Visual contact was never made. ATC gave us a traffic alert as we started our climb and we informed them we were responding to a TCAS threat and climbing. I intercepted the localizer and returned to 3500 ft and continued the approach with no further incident. Aircraft operating in class B airspace without contacting ATC and without having turned on transponder until airborne and climbing. Suggest better radar coverage for ATC facility to identify aircraft without transponders.
Original NASA ASRS Text
Title: An air carrier experienced a NMAC at 3;500 FT approaching ATL Runway 27L. The TCAS RA alerted prior to an ATC traffic alert.
Narrative: Flight was on a vector cleared to intercept 27L for a visual approach at 180 KTS and 3500 MSL. On a left base 7NM from ANVAL we received traffic warning followed by Climb Climb Climb instantly. I immediately initiated a climb from 3500 to 4500 and followed the vertical speed indicator until clear of conflict was heard. The target showed -200 then -100 in red directly underneath the aircraft. Visual contact was never made. ATC gave us a traffic alert as we started our climb and we informed them we were responding to a TCAS threat and climbing. I intercepted the LOC and returned to 3500 FT and continued the approach with no further incident. Aircraft operating in Class B airspace without contacting ATC and without having turned on transponder until airborne and climbing. Suggest better radar coverage for ATC facility to identify aircraft without transponders.
Data retrieved from NASA's ASRS site as of April 2012 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.