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An air carrier B757 flight crew report receiving a TCASII RA that rapidly went to a 'clear of conflict.' no traffic was seen by the flight crew or the controller.
| Attributes | |
| ACN | 368870 |
| Time | |
| Date | 199705 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : stt |
| State Reference | VI |
| Altitude | msl bound lower : 2000 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : stt |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 368870 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | none taken : anomaly accepted other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
On 6 mi final runway 10 stt in good VMC. Received climb RA on TCASII. While in the transition to comply with the climb RA, we received a clear of conflict message. The TCASII showed the traffic at -500 and went instantly from TA to RA. The only traffic observed was on a parallel course to final approximately 1 mi south of final and -1000 ft. We had just discussed that the traffic area appeared clear. We never had visual contact with any intruder traffic and ATC reported that there was no known traffic and was unable to visually contact any traffic. As we continued towards the airport we heard an air carrier shorts report a TCASII event.
Original NASA ASRS Text
Title: AN ACR B757 FLC RPT RECEIVING A TCASII RA THAT RAPIDLY WENT TO A 'CLR OF CONFLICT.' NO TFC WAS SEEN BY THE FLC OR THE CTLR.
Narrative: ON 6 MI FINAL RWY 10 STT IN GOOD VMC. RECEIVED CLB RA ON TCASII. WHILE IN THE TRANSITION TO COMPLY WITH THE CLB RA, WE RECEIVED A CLR OF CONFLICT MESSAGE. THE TCASII SHOWED THE TFC AT -500 AND WENT INSTANTLY FROM TA TO RA. THE ONLY TFC OBSERVED WAS ON A PARALLEL COURSE TO FINAL APPROX 1 MI S OF FINAL AND -1000 FT. WE HAD JUST DISCUSSED THAT THE TFC AREA APPEARED CLR. WE NEVER HAD VISUAL CONTACT WITH ANY INTRUDER TFC AND ATC RPTED THAT THERE WAS NO KNOWN TFC AND WAS UNABLE TO VISUALLY CONTACT ANY TFC. AS WE CONTINUED TOWARDS THE ARPT WE HEARD AN ACR SHORTS RPT A TCASII EVENT.
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.