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An mdt flight crew responded to a TCASII RA for traffic that they could not visually locate. They responded to the commands, informed ATC, and then returned to their assigned altitude when the advisory was over. The reporter believes that the other traffic's climb rate to an assigned altitude, 1000 ft below, caused the RA.
| Attributes | |
| ACN | 334050 |
| Time | |
| Date | 199604 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : stl |
| State Reference | MO |
| Altitude | msl bound lower : 7000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : stl |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Route In Use | arrival other arrival star : star enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | climbout : intermediate altitude |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 7500 flight time type : 700 |
| ASRS Report | 334050 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 1000 |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
After passing melvy intersection on rivers arrival to stl, ATC assigned 120 degree heading. TCASII in automatic mode and traffic appeared directly below us climbing fast. TCASII ordered a climb (RA), we complied. Informed ATC of RA and returned to assigned altitude. Most probable cause of this was the other aircraft was climbing excessively fast near his/her assigned altitude (6000 ft). We were unable to gain visual contact with traffic for a possible modification of the RA. There was no traffic above in conflict during RA.
Original NASA ASRS Text
Title: AN MDT FLC RESPONDED TO A TCASII RA FOR TFC THAT THEY COULD NOT VISUALLY LOCATE. THEY RESPONDED TO THE COMMANDS, INFORMED ATC, AND THEN RETURNED TO THEIR ASSIGNED ALT WHEN THE ADVISORY WAS OVER. THE RPTR BELIEVES THAT THE OTHER TFC'S CLB RATE TO AN ASSIGNED ALT, 1000 FT BELOW, CAUSED THE RA.
Narrative: AFTER PASSING MELVY INTXN ON RIVERS ARR TO STL, ATC ASSIGNED 120 DEG HDG. TCASII IN AUTO MODE AND TFC APPEARED DIRECTLY BELOW US CLBING FAST. TCASII ORDERED A CLB (RA), WE COMPLIED. INFORMED ATC OF RA AND RETURNED TO ASSIGNED ALT. MOST PROBABLE CAUSE OF THIS WAS THE OTHER ACFT WAS CLBING EXCESSIVELY FAST NEAR HIS/HER ASSIGNED ALT (6000 FT). WE WERE UNABLE TO GAIN VISUAL CONTACT WITH TFC FOR A POSSIBLE MODIFICATION OF THE RA. THERE WAS NO TFC ABOVE IN CONFLICT DURING RA.
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.