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A TCASII RA called for a 1500 FPM descent and being in the clouds the flight crew responded, told the controller, and when they broke out of the clouds there was no one there.
| Attributes | |
| ACN | 290734 |
| Time | |
| Date | 199412 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : iiu |
| State Reference | KY |
| Altitude | msl bound lower : 29500 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid tower : vny |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 50 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 80 flight time total : 13900 flight time type : 9000 |
| ASRS Report | 290734 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
30 mins after takeoff while in cruise at FL310 the TCASII gave an RA and commanded a 1500 FPM descent. Descent was commenced in response to RA and ARTCC (ZID) was immediately advised. The aircraft TCASII/ivsi indicators showed traffic level at 12 O'clock, 1 mi, level at the moment the RA occurred. Descent was made to FL295, RA went out, traffic disappeared from TCASII/ivsi. ARTCC advised that no traffic was within 20 NM of our position. We cleared the clouds 2 mins later and observed no traffic visually. We then received ATC clearance to climb back to FL310. The TCASII gave a 10 second RA during the climb but stopped as we leveled at FL310 in the clear with no traffic ever sighted. TCASII test performed immediately after incident passed.
Original NASA ASRS Text
Title: A TCASII RA CALLED FOR A 1500 FPM DSCNT AND BEING IN THE CLOUDS THE FLC RESPONDED, TOLD THE CTLR, AND WHEN THEY BROKE OUT OF THE CLOUDS THERE WAS NO ONE THERE.
Narrative: 30 MINS AFTER TKOF WHILE IN CRUISE AT FL310 THE TCASII GAVE AN RA AND COMMANDED A 1500 FPM DSCNT. DSCNT WAS COMMENCED IN RESPONSE TO RA AND ARTCC (ZID) WAS IMMEDIATELY ADVISED. THE ACFT TCASII/IVSI INDICATORS SHOWED TFC LEVEL AT 12 O'CLOCK, 1 MI, LEVEL AT THE MOMENT THE RA OCCURRED. DSCNT WAS MADE TO FL295, RA WENT OUT, TFC DISAPPEARED FROM TCASII/IVSI. ARTCC ADVISED THAT NO TFC WAS WITHIN 20 NM OF OUR POS. WE CLRED THE CLOUDS 2 MINS LATER AND OBSERVED NO TFC VISUALLY. WE THEN RECEIVED ATC CLRNC TO CLB BACK TO FL310. THE TCASII GAVE A 10 SECOND RA DURING THE CLB BUT STOPPED AS WE LEVELED AT FL310 IN THE CLR WITH NO TFC EVER SIGHTED. TCASII TEST PERFORMED IMMEDIATELY AFTER INCIDENT PASSED.
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.