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TRACON controller instructed descend--TCAS advisory was to climb--traffic visually acquired and flight crew turned to avoid.
| Attributes | |
| ACN | 180412 |
| Time | |
| Date | 199106 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : tmu |
| State Reference | CT |
| Altitude | msl bound lower : 9000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pvd tower : avl |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 180 flight time total : 10000 flight time type : 5000 |
| ASRS Report | 180412 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 250 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Level at 10000', navigating into groton VOR, communicating with ocean approach. TCAS provided TA, conflict aircraft acquired visually. Potential conflict of constant bearing closing range was apparent. ATC instructed us to descend immediately to 9000'. Rapid descent initiated TCAS provided RA of 'climb, climb.' a right turn was initiated to stop closure rate. ATC instructed us to return to 10000'. Flight continued to isp for landing. No injuries to passenger or crew experienced. As the vent developed if appeared both aircraft were complying with ATC instructions. I do not know if other aircraft had a crossing restriction that would have prevented conflict. It appeared that the instruction to descend immediately was given to wrong aircraft, or clearance was taken by wrong aircraft. In any event a turn to open the closure rate was the only action that was not in conflict with ATC instruction or TCAS RA.
Original NASA ASRS Text
Title: TRACON CTLR INSTRUCTED DESCEND--TCAS ADVISORY WAS TO CLIMB--TRAFFIC VISUALLY ACQUIRED AND FLT CREW TURNED TO AVOID.
Narrative: LEVEL AT 10000', NAVIGATING INTO GROTON VOR, COMMUNICATING WITH OCEAN APCH. TCAS PROVIDED TA, CONFLICT ACFT ACQUIRED VISUALLY. POTENTIAL CONFLICT OF CONSTANT BEARING CLOSING RANGE WAS APPARENT. ATC INSTRUCTED US TO DSND IMMEDIATELY TO 9000'. RAPID DSNT INITIATED TCAS PROVIDED RA OF 'CLB, CLB.' A RIGHT TURN WAS INITIATED TO STOP CLOSURE RATE. ATC INSTRUCTED US TO RETURN TO 10000'. FLT CONTINUED TO ISP FOR LNDG. NO INJURIES TO PAX OR CREW EXPERIENCED. AS THE VENT DEVELOPED IF APPEARED BOTH ACFT WERE COMPLYING WITH ATC INSTRUCTIONS. I DO NOT KNOW IF OTHER ACFT HAD A XING RESTRICTION THAT WOULD HAVE PREVENTED CONFLICT. IT APPEARED THAT THE INSTRUCTION TO DSND IMMEDIATELY WAS GIVEN TO WRONG ACFT, OR CLRNC WAS TAKEN BY WRONG ACFT. IN ANY EVENT A TURN TO OPEN THE CLOSURE RATE WAS THE ONLY ACTION THAT WAS NOT IN CONFLICT WITH ATC INSTRUCTION OR TCAS RA.
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.