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Medium large transport has TCASII RA, responds. ATC says they know nothing about the aircraft.
| Attributes | |
| ACN | 277344 |
| Time | |
| Date | 199407 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : cvg |
| State Reference | OH |
| Altitude | msl bound lower : 10500 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival other enroute airway : cvg |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Military |
| Operating Under FAR Part | other : other |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 3500 |
| ASRS Report | 277344 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude conflict : nmac other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 500 vertical : 100 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
We were level at 11000 ft coming into cvg on the milan 2 arrival. We got a TA of an aircraft at 12 O'clock. It appeared to be 500 ft below us. As aircraft get closer we got an RA for us to descend. Captain descended the airplane and we lost approximately 500 ft and then the TCASII reversed itself and gave us a climb. A climb was initiated and then the captain saw the aircraft pass off to our left slightly low. ATC then told us that we were to maintain 11000 ft and that we had traffic at 3 O'clock. I advised ATC that we were responding to a TCASII RA and didn't have time to tell them. Then I saw the aircraft that center was pointing out about 2-3 mi off our right wing. I told center about the aircraft that had passed just to our left and was behind as navigation but he said he knew nothing about that aircraft. The captain said he responded to the RA because he didn't know if the other aircraft was climbing into him or not. We don't know if it was a TCASII glitch or if the VFR traffic (looked like a navy trainer, small jet orange and white) was varying his altitude. My opinion is that in this situation he, traffic, was probably cruising at 10.5 and not right on his altitude. The TCASII RA descended us right into him. We would have been better off without it.
Original NASA ASRS Text
Title: MLG HAS TCASII RA, RESPONDS. ATC SAYS THEY KNOW NOTHING ABOUT THE ACFT.
Narrative: WE WERE LEVEL AT 11000 FT COMING INTO CVG ON THE MILAN 2 ARR. WE GOT A TA OF AN ACFT AT 12 O'CLOCK. IT APPEARED TO BE 500 FT BELOW US. AS ACFT GET CLOSER WE GOT AN RA FOR US TO DSND. CAPT DSNDED THE AIRPLANE AND WE LOST APPROX 500 FT AND THEN THE TCASII REVERSED ITSELF AND GAVE US A CLB. A CLB WAS INITIATED AND THEN THE CAPT SAW THE ACFT PASS OFF TO OUR L SLIGHTLY LOW. ATC THEN TOLD US THAT WE WERE TO MAINTAIN 11000 FT AND THAT WE HAD TFC AT 3 O'CLOCK. I ADVISED ATC THAT WE WERE RESPONDING TO A TCASII RA AND DIDN'T HAVE TIME TO TELL THEM. THEN I SAW THE ACFT THAT CTR WAS POINTING OUT ABOUT 2-3 MI OFF OUR R WING. I TOLD CTR ABOUT THE ACFT THAT HAD PASSED JUST TO OUR L AND WAS BEHIND AS NAV BUT HE SAID HE KNEW NOTHING ABOUT THAT ACFT. THE CAPT SAID HE RESPONDED TO THE RA BECAUSE HE DIDN'T KNOW IF THE OTHER ACFT WAS CLBING INTO HIM OR NOT. WE DON'T KNOW IF IT WAS A TCASII GLITCH OR IF THE VFR TFC (LOOKED LIKE A NAVY TRAINER, SMALL JET ORANGE AND WHITE) WAS VARYING HIS ALT. MY OPINION IS THAT IN THIS SIT HE, TFC, WAS PROBABLY CRUISING AT 10.5 AND NOT R ON HIS ALT. THE TCASII RA DSNDED US RIGHT INTO HIM. WE WOULD HAVE BEEN BETTER OFF WITHOUT IT.
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.