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CRJ200 flight crew reports momentary TCAS traffic alert 10 NM south of grr at 11000 feet where the intruder aircraft appears to climb and turn towards the reporter.
| Attributes | |
| ACN | 737038 |
| Time | |
| Date | 200705 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : grr.airport |
| State Reference | MI |
| Altitude | msl single value : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : grr.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 200 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| 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 |
| Experience | flight time last 90 days : 200 flight time total : 6000 flight time type : 3500 |
| ASRS Report | 737038 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment : tcas other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took precautionary avoidance action |
| Supplementary | |
| Problem Areas | Aircraft ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Ambiguous |
Narrative:
Approximately 10-15 NM ssw of grr at 11000 ft MSL; ATC advised us that an aircraft was at our 1-2 O'clock position at 8500 ft unverified. We confirmed that information with our TCAS and it was accurate. We then slowed our descent to avoid a conflict. The other aircraft was steady state of 8500 ft. When the other aircraft was within approximately 1 NM; the other aircraft initiated a climb. So to avoid a conflict; we requested a left turn and a climb; which was approved by ATC. When we were in the turn we noticed that the other aircraft not only was climbing; but was also now following our flight path. After we initiated the climb we got a TCAS caution message briefly. After some vectors from ATC the flight continued uneventfully.
Original NASA ASRS Text
Title: CRJ200 FLT CREW REPORTS MOMENTARY TCAS TRAFFIC ALERT 10 NM SOUTH OF GRR AT 11000 FEET WHERE THE INTRUDER ACFT APPEARS TO CLIMB AND TURN TOWARDS THE REPORTER.
Narrative: APPROX 10-15 NM SSW OF GRR AT 11000 FT MSL; ATC ADVISED US THAT AN ACFT WAS AT OUR 1-2 O'CLOCK POS AT 8500 FT UNVERIFIED. WE CONFIRMED THAT INFO WITH OUR TCAS AND IT WAS ACCURATE. WE THEN SLOWED OUR DSCNT TO AVOID A CONFLICT. THE OTHER ACFT WAS STEADY STATE OF 8500 FT. WHEN THE OTHER ACFT WAS WITHIN APPROX 1 NM; THE OTHER ACFT INITIATED A CLB. SO TO AVOID A CONFLICT; WE REQUESTED A L TURN AND A CLB; WHICH WAS APPROVED BY ATC. WHEN WE WERE IN THE TURN WE NOTICED THAT THE OTHER ACFT NOT ONLY WAS CLBING; BUT WAS ALSO NOW FOLLOWING OUR FLT PATH. AFTER WE INITIATED THE CLB WE GOT A TCAS CAUTION MESSAGE BRIEFLY. AFTER SOME VECTORS FROM ATC THE FLT CONTINUED UNEVENTFULLY.
Data retrieved from NASA's ASRS site as of January 2009 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.