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Flight crew of air carrier medium large transport aircraft received what appeared to be a false warning from their TCASII equipment.
| Attributes | |
| ACN | 225108 |
| Time | |
| Date | 199211 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : buf |
| State Reference | NY |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 7000 |
| ASRS Report | 225108 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 1000 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
While at cruise altitude and airspeed, center gave us a 30 degree left turn for spacing into detroit. About 3 min later, the TCASII gave us 'traffic' and we spotted an air carrier widebody transport crossing our path right to left. At that time, center gave us a right turn back which took us nearly over the widebody transport aircraft. At no time did he call out the traffic. Shortly thereafter, we got 'climb, climb' from the TCASII even though we were obviously above and would remain above air carrier widebody transport. They were in cruise also. Symbology indicated that a 500 FPM climb was required. At the captain's direction we ignored the RA and after passing over air carrier widebody transport we got a 'clear of conflict.' this is the fourth RA I have experienced. All have been false. Something needs to be done to improve this system, especially in high traffic areas.
Original NASA ASRS Text
Title: FLC OF ACR MLG ACFT RECEIVED WHAT APPEARED TO BE A FALSE WARNING FROM THEIR TCASII EQUIP.
Narrative: WHILE AT CRUISE ALT AND AIRSPD, CTR GAVE US A 30 DEG L TURN FOR SPACING INTO DETROIT. ABOUT 3 MIN LATER, THE TCASII GAVE US 'TFC' AND WE SPOTTED AN ACR WDB XING OUR PATH R TO L. AT THAT TIME, CTR GAVE US A R TURN BACK WHICH TOOK US NEARLY OVER THE WDB ACFT. AT NO TIME DID HE CALL OUT THE TFC. SHORTLY THEREAFTER, WE GOT 'CLB, CLB' FROM THE TCASII EVEN THOUGH WE WERE OBVIOUSLY ABOVE AND WOULD REMAIN ABOVE ACR WDB. THEY WERE IN CRUISE ALSO. SYMBOLOGY INDICATED THAT A 500 FPM CLB WAS REQUIRED. AT THE CAPT'S DIRECTION WE IGNORED THE RA AND AFTER PASSING OVER ACR WDB WE GOT A 'CLR OF CONFLICT.' THIS IS THE FOURTH RA I HAVE EXPERIENCED. ALL HAVE BEEN FALSE. SOMETHING NEEDS TO BE DONE TO IMPROVE THIS SYS, ESPECIALLY IN HIGH TFC AREAS.
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.