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ARTCC radar controller reports that 2 air carrier aircraft received false TCASII RA's while flying 75-100 NM west of grb VOR. The first aircraft, a B757 at FL290, climbed in response to the RA and was advised his only traffic was a B747 at FL330 which was 4000 ft above him. Shortly after this incident, a DC9 at FL310, received a climb RA as he passed beneath the B747.
| Attributes | |
| ACN | 381881 |
| Time | |
| Date | 199710 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : grb |
| State Reference | WI |
| Altitude | msl bound lower : 29000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp |
| 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 | climbout : intermediate altitude cruise other descent other |
| Route In Use | departure other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 15 |
| ASRS Report | 381881 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 180 flight time total : 8000 flight time type : 700 |
| ASRS Report | 381987 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Aircraft #1 on shine 1 departure out of msp at FL290. Aircraft #2 flying J89 sebound at FL330. Aircraft #1 advises he has received a TCASII RA to climb, traffic 500 ft below. I inform aircraft #1 that traffic is at FL330 and to maintain FL290. Aircraft #1 states that he is descending back to FL290. The highest ATC observed altitude reached by aircraft #1 is FL307. Approximately 3 mins later, aircraft #3 (a DC9) at FL310 passes beneath aircraft #2. The pilot advises he has received a TCASII RA to climb, traffic 500 ft below. Since aircraft #3 was on the same frequency as aircraft #1 and was also issued traffic for aircraft #2, the pilot disregarded the TCASII RA and remained at FL310. Aircraft #3 then reported aircraft #2 in sight at FL330. Supplemental information from acn 381987: TCASII gave RA climb due to an aircraft at 10 O'clock, 500 ft below and climbing. ATC stated that no traffic was there. We were at FL290. Only traffic near us was at FL330 at our 12 O'clock position in level flight. Company flight behind us also received traffic alert for same situation without an RA.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR RPTS THAT 2 ACR ACFT RECEIVED FALSE TCASII RA'S WHILE FLYING 75-100 NM W OF GRB VOR. THE FIRST ACFT, A B757 AT FL290, CLBED IN RESPONSE TO THE RA AND WAS ADVISED HIS ONLY TFC WAS A B747 AT FL330 WHICH WAS 4000 FT ABOVE HIM. SHORTLY AFTER THIS INCIDENT, A DC9 AT FL310, RECEIVED A CLB RA AS HE PASSED BENEATH THE B747.
Narrative: ACFT #1 ON SHINE 1 DEP OUT OF MSP AT FL290. ACFT #2 FLYING J89 SEBOUND AT FL330. ACFT #1 ADVISES HE HAS RECEIVED A TCASII RA TO CLB, TFC 500 FT BELOW. I INFORM ACFT #1 THAT TFC IS AT FL330 AND TO MAINTAIN FL290. ACFT #1 STATES THAT HE IS DSNDING BACK TO FL290. THE HIGHEST ATC OBSERVED ALT REACHED BY ACFT #1 IS FL307. APPROX 3 MINS LATER, ACFT #3 (A DC9) AT FL310 PASSES BENEATH ACFT #2. THE PLT ADVISES HE HAS RECEIVED A TCASII RA TO CLB, TFC 500 FT BELOW. SINCE ACFT #3 WAS ON THE SAME FREQ AS ACFT #1 AND WAS ALSO ISSUED TFC FOR ACFT #2, THE PLT DISREGARDED THE TCASII RA AND REMAINED AT FL310. ACFT #3 THEN RPTED ACFT #2 IN SIGHT AT FL330. SUPPLEMENTAL INFO FROM ACN 381987: TCASII GAVE RA CLB DUE TO AN ACFT AT 10 O'CLOCK, 500 FT BELOW AND CLBING. ATC STATED THAT NO TFC WAS THERE. WE WERE AT FL290. ONLY TFC NEAR US WAS AT FL330 AT OUR 12 O'CLOCK POS IN LEVEL FLT. COMPANY FLT BEHIND US ALSO RECEIVED TFC ALERT FOR SAME SIT WITHOUT AN 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.