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L1011 flight crew receives a TCASII TA then RA then approach control alert to climb. Other aircraft supposed to be maintaining visual separation.
| Attributes | |
| ACN | 337591 |
| Time | |
| Date | 199606 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 7300 msl bound upper : 7500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011 Tri-Star All Series |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 10000 flight time type : 2000 |
| ASRS Report | 337591 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : nmac other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 500 vertical : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Descending into atl in clear and VFR conditions, the first officer was flying. We were on vectors for the ILS runway 8L when we first received a TA on the TCASII at about 7500 ft MSL, followed quickly by an RA and simultaneously by approach control telling us to make an immediate climb to 7500 ft for a DC9 at 7000 ft who was supposed to be maintaining visual separation from us. The TCASII said one time, 'descend' and then went to 'climb.' we took aggressive action but lost sight of the DC9 as we climbed back to 7500 ft. I believe some factors involved that slowed my response were the DC9 was military (no TCASII). When the TCASII sounded 'descend,' I expected the DC9 to climb, but with no TCASII, he received no commands. Additionally, his position relative to the atlanta airport was inconsistent with normal arrs to the atl airport in that he was level at 7000 ft north of where he should have been and heading north. I learned later he was going to dobbins AFB on an arrival for that airport, but I was not expecting him in that position and there was no communication from approach control about him until we were told to climb to 7500 ft.
Original NASA ASRS Text
Title: L1011 FLC RECEIVES A TCASII TA THEN RA THEN APCH CTL ALERT TO CLB. OTHER ACFT SUPPOSED TO BE MAINTAINING VISUAL SEPARATION.
Narrative: DSNDING INTO ATL IN CLR AND VFR CONDITIONS, THE FO WAS FLYING. WE WERE ON VECTORS FOR THE ILS RWY 8L WHEN WE FIRST RECEIVED A TA ON THE TCASII AT ABOUT 7500 FT MSL, FOLLOWED QUICKLY BY AN RA AND SIMULTANEOUSLY BY APCH CTL TELLING US TO MAKE AN IMMEDIATE CLB TO 7500 FT FOR A DC9 AT 7000 FT WHO WAS SUPPOSED TO BE MAINTAINING VISUAL SEPARATION FROM US. THE TCASII SAID ONE TIME, 'DSND' AND THEN WENT TO 'CLB.' WE TOOK AGGRESSIVE ACTION BUT LOST SIGHT OF THE DC9 AS WE CLBED BACK TO 7500 FT. I BELIEVE SOME FACTORS INVOLVED THAT SLOWED MY RESPONSE WERE THE DC9 WAS MIL (NO TCASII). WHEN THE TCASII SOUNDED 'DSND,' I EXPECTED THE DC9 TO CLB, BUT WITH NO TCASII, HE RECEIVED NO COMMANDS. ADDITIONALLY, HIS POS RELATIVE TO THE ATLANTA ARPT WAS INCONSISTENT WITH NORMAL ARRS TO THE ATL ARPT IN THAT HE WAS LEVEL AT 7000 FT N OF WHERE HE SHOULD HAVE BEEN AND HDG N. I LEARNED LATER HE WAS GOING TO DOBBINS AFB ON AN ARR FOR THAT ARPT, BUT I WAS NOT EXPECTING HIM IN THAT POS AND THERE WAS NO COM FROM APCH CTL ABOUT HIM UNTIL WE WERE TOLD TO CLB TO 7500 FT.
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.