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Air carrier on approach to anc at 6000 is issued traffic below; controller vector/altitude assignment resulted in TCAS RA.
| Attributes | |
| ACN | 800290 |
| Time | |
| Date | 200808 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : anc.airport |
| State Reference | AK |
| Altitude | msl single value : 6000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : a11.tracon tower : bur.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Cessna Aircraft Undifferentiated or Other Model |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 38 flight time type : 23 |
| ASRS Report | 800290 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 40 flight time type : 8000 |
| ASRS Report | 800288 |
| Events | |
| Anomaly | conflict : airborne critical |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | none taken : anomaly accepted |
| Miss Distance | vertical : 600 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Weather ATC Human Performance |
| Primary Problem | Ambiguous |
Narrative:
We were flying an approach into anc. While descending to 6000 ft on a vector for the ILS 14; we were advised of traffic at our 11 O'clock position; a cessna; below our altitude. The captain was the PNF and advised anc approach that we were IMC. Approach then gave us a vector 10 degrees to the left; putting the traffic at our 12 O'clock position. We became concerned as we watched the traffic on TCAS directly ahead and less than 1000 ft below us. As we descended; we got a TCAS RA. I clicked off the autoplt and autothrottles to follow the TCAS guidance. I looked at the TCAS and noted that the traffic was 600 ft below us. We cleared the conflict and advised ATC of the RA. We were then given vectors for an uneventful ILS. Better attention to IFR and VFR traffic in the same airspace on the part of ATC.
Original NASA ASRS Text
Title: ACR ON APCH TO ANC AT 6000 IS ISSUED TFC BELOW; CTLR VECTOR/ALT ASSIGNMENT RESULTED IN TCAS RA.
Narrative: WE WERE FLYING AN APCH INTO ANC. WHILE DSNDING TO 6000 FT ON A VECTOR FOR THE ILS 14; WE WERE ADVISED OF TFC AT OUR 11 O'CLOCK POS; A CESSNA; BELOW OUR ALT. THE CAPT WAS THE PNF AND ADVISED ANC APCH THAT WE WERE IMC. APCH THEN GAVE US A VECTOR 10 DEGS TO THE L; PUTTING THE TFC AT OUR 12 O'CLOCK POS. WE BECAME CONCERNED AS WE WATCHED THE TFC ON TCAS DIRECTLY AHEAD AND LESS THAN 1000 FT BELOW US. AS WE DSNDED; WE GOT A TCAS RA. I CLICKED OFF THE AUTOPLT AND AUTOTHROTTLES TO FOLLOW THE TCAS GUIDANCE. I LOOKED AT THE TCAS AND NOTED THAT THE TFC WAS 600 FT BELOW US. WE CLRED THE CONFLICT AND ADVISED ATC OF THE RA. WE WERE THEN GIVEN VECTORS FOR AN UNEVENTFUL ILS. BETTER ATTN TO IFR AND VFR TFC IN THE SAME AIRSPACE ON THE PART OF ATC.
Data retrieved from NASA's ASRS site as of May 2009 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.