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Less than standard separation between air carrier medium large transport in cruise and unknown climbing opposite direction. TCASII signaled RA climb.
| Attributes | |
| ACN | 198915 |
| Time | |
| Date | 199201 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : gso |
| State Reference | NC |
| Altitude | msl bound lower : 23000 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl tracon : abe |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 230 flight time total : 17000 flight time type : 500 |
| ASRS Report | 198915 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 10000 flight time type : 6500 |
| ASRS Report | 199390 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 1500 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Inter Facility Coordination Failure |
Narrative:
At cruise at FL230, TCASII TA sounded. The intruder showed 1500 ft below us and climbing toward us at our 12 O'clock position. The advisory immediately changed to an RA and the TCASII commanded an immediate climb of approximately 1500 FPM. A climb was initiated immediately in compliance with the TCASII. At approximately 23900 ft the traffic indicated (on TCASII) it was 600 ft below us and just of the right side still climbing. I leveled the aircraft at FL240 and noted that the clear of TA was never given by TCASII. I informed ATC (ZTL 124.42) of our altitude change and of the traffic and asked if he concurred with the traffic. He said he did not see the traffic until it was behind us and said he would get back to us. He then switched us to ZJX without further explanation.
Original NASA ASRS Text
Title: LTSS BTWN ACR MLG IN CRUISE AND UNKNOWN CLBING OPPOSITE DIRECTION. TCASII SIGNALED RA CLB.
Narrative: AT CRUISE AT FL230, TCASII TA SOUNDED. THE INTRUDER SHOWED 1500 FT BELOW US AND CLBING TOWARD US AT OUR 12 O'CLOCK POS. THE ADVISORY IMMEDIATELY CHANGED TO AN RA AND THE TCASII COMMANDED AN IMMEDIATE CLB OF APPROX 1500 FPM. A CLB WAS INITIATED IMMEDIATELY IN COMPLIANCE WITH THE TCASII. AT APPROX 23900 FT THE TFC INDICATED (ON TCASII) IT WAS 600 FT BELOW US AND JUST OF THE R SIDE STILL CLBING. I LEVELED THE ACFT AT FL240 AND NOTED THAT THE CLR OF TA WAS NEVER GIVEN BY TCASII. I INFORMED ATC (ZTL 124.42) OF OUR ALT CHANGE AND OF THE TFC AND ASKED IF HE CONCURRED WITH THE TFC. HE SAID HE DID NOT SEE THE TFC UNTIL IT WAS BEHIND US AND SAID HE WOULD GET BACK TO US. HE THEN SWITCHED US TO ZJX WITHOUT FURTHER EXPLANATION.
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.