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Flight crew of MD11 experienced TCASII RA while being vectored on base to final approach runway 16R at sea. Passed directly over TCASII traffic which sea approach said did not appear on his radar scope.
| Attributes | |
| ACN | 590294 |
| Time | |
| Date | 200308 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sea.airport |
| State Reference | WA |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : s46.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft, Low Wing, 2 Eng, Retractable Gear |
| Flight Phase | cruise : level |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : flight engineer |
| Experience | flight time last 90 days : 71 flight time total : 3925 flight time type : 71 |
| ASRS Report | 590294 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance Airspace Structure |
| Primary Problem | Airspace Structure |
Narrative:
I was flying an MD11 and on a vector from base to final for runway 16R under radar control with approach control. During straight and level flight at assigned vector altitude, the TCASII activated with a voice alert 'traffic, climb.' an RA of 3000 FPM climb was commanded by the TCASII and the maneuver was executed without hesitation. The captain (PNF) observed a light twin-engine (propeller, not a jet) aircraft climbing into our altitude assignment and on a collision course. The MD11 flew over the top of the light twin during the TCASII RA maneuver. The MD11 crew advised the approach controller of the TCASII RA as well as the visual sighting of the other aircraft and that the crew had performed an RA escape maneuver. The approach controller stated he had nothing on his scope in the proximity of the MD11 aircraft. The MD11 was subsequently cleared by approach control and maneuvered back to final approach and landed without incident.
Original NASA ASRS Text
Title: FLT CREW OF MD11 EXPERIENCED TCASII RA WHILE BEING VECTORED ON BASE TO FINAL APCH RWY 16R AT SEA. PASSED DIRECTLY OVER TCASII TFC WHICH SEA APCH SAID DID NOT APPEAR ON HIS RADAR SCOPE.
Narrative: I WAS FLYING AN MD11 AND ON A VECTOR FROM BASE TO FINAL FOR RWY 16R UNDER RADAR CTL WITH APCH CTL. DURING STRAIGHT AND LEVEL FLT AT ASSIGNED VECTOR ALT, THE TCASII ACTIVATED WITH A VOICE ALERT 'TFC, CLB.' AN RA OF 3000 FPM CLB WAS COMMANDED BY THE TCASII AND THE MANEUVER WAS EXECUTED WITHOUT HESITATION. THE CAPT (PNF) OBSERVED A LIGHT TWIN-ENG (PROP, NOT A JET) ACFT CLBING INTO OUR ALT ASSIGNMENT AND ON A COLLISION COURSE. THE MD11 FLEW OVER THE TOP OF THE LIGHT TWIN DURING THE TCASII RA MANEUVER. THE MD11 CREW ADVISED THE APCH CTLR OF THE TCASII RA AS WELL AS THE VISUAL SIGHTING OF THE OTHER ACFT AND THAT THE CREW HAD PERFORMED AN RA ESCAPE MANEUVER. THE APCH CTLR STATED HE HAD NOTHING ON HIS SCOPE IN THE PROX OF THE MD11 ACFT. THE MD11 WAS SUBSEQUENTLY CLRED BY APCH CTL AND MANEUVERED BACK TO FINAL APCH AND LANDED WITHOUT INCIDENT.
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.