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B737 flight crew on inbound arrival vectors descending into cle, take evasive TCASII action due to conflicting traffic.
| Attributes | |
| ACN | 420870 |
| Time | |
| Date | 199811 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : cle |
| State Reference | OH |
| Altitude | msl bound lower : 7000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : private pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 15000 flight time type : 7000 |
| ASRS Report | 420870 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 80 flight time total : 11700 flight time type : 3 |
| ASRS Report | 421201 |
| Events | |
| Anomaly | conflict : ground critical non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 0 |
| Supplementary | |
| Air Traffic Incident | Operational Error |
Narrative:
We were cleared to descend from 10000 ft to 8000 ft then slow to 210 KTS. Prior to leveling at 8000 ft, ATC reclred us to 6000 ft. We slowed to 210 KTS passing 8000 ft by slowing our descent to 300-500 FPM. While approaching 7000 ft ATC instructed us to turn immediately to 010 degrees and expedite descent. Just prior to that, our TCASII RA was saying descend. As we made the turn, the TCASII RA changed to climb. We had the speed brakes out and it took a while to get the plane climbing, with full power and 15-20 degrees nose up. When the TCASII ended, we leveled at 8400 ft and then descended, as directed by ATC. We estimate we were at the same altitude (7000 ft) as traffic and approximately 2 mi. We never had visual contact with traffic. Possibly the speed decrease at 8000 ft was a contributing factor as this airplane is hard to slow when descending. And the ATC controller did not plan it.
Original NASA ASRS Text
Title: B737 FLC ON INBOUND ARR VECTORS DSNDING INTO CLE, TAKE EVASIVE TCASII ACTION DUE TO CONFLICTING TFC.
Narrative: WE WERE CLRED TO DSND FROM 10000 FT TO 8000 FT THEN SLOW TO 210 KTS. PRIOR TO LEVELING AT 8000 FT, ATC RECLRED US TO 6000 FT. WE SLOWED TO 210 KTS PASSING 8000 FT BY SLOWING OUR DSCNT TO 300-500 FPM. WHILE APCHING 7000 FT ATC INSTRUCTED US TO TURN IMMEDIATELY TO 010 DEGS AND EXPEDITE DSCNT. JUST PRIOR TO THAT, OUR TCASII RA WAS SAYING DSND. AS WE MADE THE TURN, THE TCASII RA CHANGED TO CLB. WE HAD THE SPD BRAKES OUT AND IT TOOK A WHILE TO GET THE PLANE CLBING, WITH FULL PWR AND 15-20 DEGS NOSE UP. WHEN THE TCASII ENDED, WE LEVELED AT 8400 FT AND THEN DSNDED, AS DIRECTED BY ATC. WE ESTIMATE WE WERE AT THE SAME ALT (7000 FT) AS TFC AND APPROX 2 MI. WE NEVER HAD VISUAL CONTACT WITH TFC. POSSIBLY THE SPD DECREASE AT 8000 FT WAS A CONTRIBUTING FACTOR AS THIS AIRPLANE IS HARD TO SLOW WHEN DSNDING. AND THE ATC CTLR DID NOT PLAN IT.
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.