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Flight crew of a saab SF340B (SF34L), descended in response to a TCASII RA. A false TCASII warning is believed possible by the crew since ATC showed no traffic in their vicinity nor did the crew sight traffic.
| Attributes | |
| ACN | 403840 |
| Time | |
| Date | 199806 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : fnt |
| State Reference | MI |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dtw tower : fai |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340B |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 270 flight time total : 4000 flight time type : 1500 |
| ASRS Report | 403840 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Dtw-fnt. About 18 mi southeast of fnt we responded to an RA to descend. We did not visually see any aircraft so we complied. We never did receive a TA. I believe the RA was false. There did turn out to be traffic 1500 ft below us but the TCASII commanded us to descend. There was never any conflicts with any aircraft per a reply from dtw approach.
Original NASA ASRS Text
Title: FLC OF A SAAB SF340B (SF34L), DSNDED IN RESPONSE TO A TCASII RA. A FALSE TCASII WARNING IS BELIEVED POSSIBLE BY THE CREW SINCE ATC SHOWED NO TFC IN THEIR VICINITY NOR DID THE CREW SIGHT TFC.
Narrative: DTW-FNT. ABOUT 18 MI SE OF FNT WE RESPONDED TO AN RA TO DSND. WE DID NOT VISUALLY SEE ANY ACFT SO WE COMPLIED. WE NEVER DID RECEIVE A TA. I BELIEVE THE RA WAS FALSE. THERE DID TURN OUT TO BE TFC 1500 FT BELOW US BUT THE TCASII COMMANDED US TO DSND. THERE WAS NEVER ANY CONFLICTS WITH ANY ACFT PER A REPLY FROM DTW APCH.
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.