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An altitude excursion out of FL350 when a CL65 PIC follows his TCASII RA that was issuing a false warning for a descent out of his assigned altitude 20 NM north of mei, ms.
| Attributes | |
| ACN | 550804 |
| Time | |
| Date | 200206 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zme.artcc |
| State Reference | TN |
| Altitude | msl bound lower : 34000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 200 ER&LR |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 3000 flight time type : 500 |
| ASRS Report | 550804 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | aircraft equipment : tcas other controllera other flight crewa other flight crewb |
| Resolutory Action | flight crew : returned to assigned altitude none taken : detected after the fact other |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
In cruise at FL350 just north of mei, we received a TCASII TA. The TCASII display indicated there was traffic at our altitude 6 mi ahead, at 1 O'clock position. The first officer and I became very heads up as we scanned outside for the traffic. Approximately 5 seconds after the original TA, we received an aural RA of 'descend, descend.' with this warning, company procedures dictate that the autoplt be disarmed and an immediate descent of 1500 FPM be initiated. I followed these procedures and descended to FL340 when the RA and TA stopped. As soon as we began the descent, the first officer radioed ATC to inform them of the intrusion and our descent. It soon became apparent that our TCASII had provided faulty indications as a thorough visual scan of the area and ATC surveillance showed no conflicting targets. We climbed back to FL350 and the flight continued with no further events.
Original NASA ASRS Text
Title: AN ALT EXCURSION OUT OF FL350 WHEN A CL65 PIC FOLLOWS HIS TCASII RA THAT WAS ISSUING A FALSE WARNING FOR A DSCNT OUT OF HIS ASSIGNED ALT 20 NM N OF MEI, MS.
Narrative: IN CRUISE AT FL350 JUST N OF MEI, WE RECEIVED A TCASII TA. THE TCASII DISPLAY INDICATED THERE WAS TFC AT OUR ALT 6 MI AHEAD, AT 1 O'CLOCK POS. THE FO AND I BECAME VERY HEADS UP AS WE SCANNED OUTSIDE FOR THE TFC. APPROX 5 SECONDS AFTER THE ORIGINAL TA, WE RECEIVED AN AURAL RA OF 'DSND, DSND.' WITH THIS WARNING, COMPANY PROCS DICTATE THAT THE AUTOPLT BE DISARMED AND AN IMMEDIATE DSCNT OF 1500 FPM BE INITIATED. I FOLLOWED THESE PROCS AND DSNDED TO FL340 WHEN THE RA AND TA STOPPED. AS SOON AS WE BEGAN THE DSCNT, THE FO RADIOED ATC TO INFORM THEM OF THE INTRUSION AND OUR DSCNT. IT SOON BECAME APPARENT THAT OUR TCASII HAD PROVIDED FAULTY INDICATIONS AS A THOROUGH VISUAL SCAN OF THE AREA AND ATC SURVEILLANCE SHOWED NO CONFLICTING TARGETS. WE CLBED BACK TO FL350 AND THE FLT CONTINUED WITH NO FURTHER EVENTS.
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.