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Flight crew of a canadair regional jet CL65 stopped descent and climbed in response to a TCASII RA even though center controller had issued a TA since they were in IMC.
| Attributes | |
| ACN | 432869 |
| Time | |
| Date | 199903 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : abb.vortac |
| State Reference | IN |
| Altitude | msl bound lower : 17000 msl bound upper : 17600 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger CL604 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 250 flight time total : 3100 flight time type : 1000 |
| ASRS Report | 432869 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 18000 flight time type : 2400 |
| ASRS Report | 432653 |
| Events | |
| Anomaly | conflict : airborne critical other anomaly other |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | controller : issued advisory flight crew : took evasive action |
| Miss Distance | vertical : 1200 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
While descending to 17000 ft, ATC issued a TA for traffic at 11 O'clock climbing to 16000 ft. We went to TCASII mode and then received a traffic alert at approximately 17500 ft. At approximately 17300 ft, we received the RA which commanded a climb. The ivsi command was followed and then a monitor vertical speed was received. At 17500-17600 ft, clear of conflict was given. The other aircraft was leveling at 16000 ft and our descent rate was less than 1200 FPM. Neither I nor the captain believe that the RA was warranted, but in IMC we complied. No ATC conflict took place and we descended to 17000 ft.
Original NASA ASRS Text
Title: FLC OF A CANADAIR REGIONAL JET CL65 STOPPED DSCNT AND CLBED IN RESPONSE TO A TCASII RA EVEN THOUGH CTR CTLR HAD ISSUED A TA SINCE THEY WERE IN IMC.
Narrative: WHILE DSNDING TO 17000 FT, ATC ISSUED A TA FOR TFC AT 11 O'CLOCK CLBING TO 16000 FT. WE WENT TO TCASII MODE AND THEN RECEIVED A TFC ALERT AT APPROX 17500 FT. AT APPROX 17300 FT, WE RECEIVED THE RA WHICH COMMANDED A CLB. THE IVSI COMMAND WAS FOLLOWED AND THEN A MONITOR VERT SPD WAS RECEIVED. AT 17500-17600 FT, CLR OF CONFLICT WAS GIVEN. THE OTHER ACFT WAS LEVELING AT 16000 FT AND OUR DSCNT RATE WAS LESS THAN 1200 FPM. NEITHER I NOR THE CAPT BELIEVE THAT THE RA WAS WARRANTED, BUT IN IMC WE COMPLIED. NO ATC CONFLICT TOOK PLACE AND WE DSNDED TO 17000 FT.
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.