 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Flight crew of a cpr falcon 20F did not respond to a TCASII RA during vectors to the ILS since approach controller had provided a TA, descent leveloff and turn to assure traffic separation. In addition, the flight crew had the B737 sighted.
| Attributes | |
| ACN | 454409 |
| Time | |
| Date | 199911 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : atl.airport |
| State Reference | GA |
| Altitude | msl single value : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Falcon 20FJF/20C/20D/20E/20F |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : atl.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine pilot : atp |
| Experience | flight time last 90 days : 80 flight time total : 12565 flight time type : 1035 |
| ASRS Report | 454409 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : multi engine pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 90 flight time total : 11000 flight time type : 800 |
| ASRS Report | 454834 |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment : tcas other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance controller : issued advisory controller : separated traffic flight crew : took precautionary avoidance action |
| Miss Distance | horizontal : 12000 vertical : 400 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
We were eastbound on a right downwind leg, vectors for the ILS to runway 26R at atl, and descending to 5000 ft as assigned by ATC. Out of approximately 6500 ft, the TCASII issued a TA for traffic at our 9:30 O'clock position. We established visual contact with aircraft Y passenger jet at approximately 2 1/2 mi and 400 ft below us. I believe it was a B737. We stopped the descent. At the same time, atl approach ordered us to level at 6000 ft and turn right to a heading of 130 degrees. Upon leveling at 6000 ft, the TCASII issued a 'climb' RA. Since we had visual contact with the other aircraft, and it was clear they would descend below us, we maintained 6000 ft. Aircraft Y was on a heading of approximately 180 degrees. They were also descending. The TCASII was the first warning of an impending conflict. Its value cannot be overstated. The TA gave us time to evaluate and resolve a developing traffic problem. A correct and timely RA was issued which would have prevented a close call or worse, had we been unable to establish visual contact. Supplemental information from acn 454834: I believe the airliner was slow in its descent, and approach control didn't catch the possible conflict.
Original NASA ASRS Text
Title: FLC OF A CPR FALCON 20F DID NOT RESPOND TO A TCASII RA DURING VECTORS TO THE ILS SINCE APCH CTLR HAD PROVIDED A TA, DSCNT LEVELOFF AND TURN TO ASSURE TFC SEPARATION. IN ADDITION, THE FLC HAD THE B737 SIGHTED.
Narrative: WE WERE EBOUND ON A R DOWNWIND LEG, VECTORS FOR THE ILS TO RWY 26R AT ATL, AND DSNDING TO 5000 FT AS ASSIGNED BY ATC. OUT OF APPROX 6500 FT, THE TCASII ISSUED A TA FOR TFC AT OUR 9:30 O'CLOCK POS. WE ESTABLISHED VISUAL CONTACT WITH ACFT Y PAX JET AT APPROX 2 1/2 MI AND 400 FT BELOW US. I BELIEVE IT WAS A B737. WE STOPPED THE DSCNT. AT THE SAME TIME, ATL APCH ORDERED US TO LEVEL AT 6000 FT AND TURN R TO A HDG OF 130 DEGS. UPON LEVELING AT 6000 FT, THE TCASII ISSUED A 'CLB' RA. SINCE WE HAD VISUAL CONTACT WITH THE OTHER ACFT, AND IT WAS CLR THEY WOULD DSND BELOW US, WE MAINTAINED 6000 FT. ACFT Y WAS ON A HDG OF APPROX 180 DEGS. THEY WERE ALSO DSNDING. THE TCASII WAS THE FIRST WARNING OF AN IMPENDING CONFLICT. ITS VALUE CANNOT BE OVERSTATED. THE TA GAVE US TIME TO EVALUATE AND RESOLVE A DEVELOPING TFC PROB. A CORRECT AND TIMELY RA WAS ISSUED WHICH WOULD HAVE PREVENTED A CLOSE CALL OR WORSE, HAD WE BEEN UNABLE TO ESTABLISH VISUAL CONTACT. SUPPLEMENTAL INFO FROM ACN 454834: I BELIEVE THE AIRLINER WAS SLOW IN ITS DSCNT, AND APCH CTL DIDN'T CATCH THE POSSIBLE CONFLICT.
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.