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A B767 flight crew given ATC clearance to descend to 6000 ft, but receives a TCASII 'climb, climb' RA. The flight crew followed the TCASII, then notified ATC.
| Attributes | |
| ACN | 575143 |
| Time | |
| Date | 200302 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | OH |
| Altitude | msl single value : 6000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : day.tracon tower : dfw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B767-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : day.tracon |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : commercial pilot : atp pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 165 flight time total : 10500 flight time type : 1800 |
| ASRS Report | 575143 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne critical |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued alert flight crew : overrode automation flight crew : took evasive action flight crew : took precautionary avoidance action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance Airspace Structure Flight Crew Human Performance Weather |
| Primary Problem | Ambiguous |
Narrative:
Given a descent from 7000 ft to 6000 ft by day approach. He advised us of traffic at our 12 O'clock position, which we saw on TCASII as 1800-1900 ft below us. TCASII changed from TA to RA as we leveled at 6000 ft. I disconnected the autoplt and initiated a climb as advised by our TCASII. At 7000 ft, TCASII advised traffic no longer a factor. We let dayton know we were complying with an RA immediately. At no time did we ever see our traffic visually. Dayton responded that he noticed our traffic climbing. We came within 400-500 ft vertically. We attempted to spot our traffic but, in MVFR, were not successful. In my experience, dayton is an overworked ATC facility. They do excellent work, but have numerous military/civilian/part 121 operations to manage.
Original NASA ASRS Text
Title: A B767 FLT CREW GIVEN ATC CLRNC TO DSND TO 6000 FT, BUT RECEIVES A TCASII 'CLB, CLB' RA. THE FLT CREW FOLLOWED THE TCASII, THEN NOTIFIED ATC.
Narrative: GIVEN A DSCNT FROM 7000 FT TO 6000 FT BY DAY APCH. HE ADVISED US OF TFC AT OUR 12 O'CLOCK POS, WHICH WE SAW ON TCASII AS 1800-1900 FT BELOW US. TCASII CHANGED FROM TA TO RA AS WE LEVELED AT 6000 FT. I DISCONNECTED THE AUTOPLT AND INITIATED A CLB AS ADVISED BY OUR TCASII. AT 7000 FT, TCASII ADVISED TFC NO LONGER A FACTOR. WE LET DAYTON KNOW WE WERE COMPLYING WITH AN RA IMMEDIATELY. AT NO TIME DID WE EVER SEE OUR TFC VISUALLY. DAYTON RESPONDED THAT HE NOTICED OUR TFC CLBING. WE CAME WITHIN 400-500 FT VERTLY. WE ATTEMPTED TO SPOT OUR TFC BUT, IN MVFR, WERE NOT SUCCESSFUL. IN MY EXPERIENCE, DAYTON IS AN OVERWORKED ATC FACILITY. THEY DO EXCELLENT WORK, BUT HAVE NUMEROUS MIL/CIVILIAN/PART 121 OPS TO MANAGE.
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.