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Iad approach controller does not issue traffic to a descending B767 crew because he felt traffic was not a factor.
| Attributes | |
| ACN | 552930 |
| Time | |
| Date | 200207 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : doccs |
| State Reference | VA |
| Altitude | msl bound lower : 9600 msl bound upper : 10200 |
| Environment | |
| Weather Elements | other |
| Aircraft 1 | |
| Controlling Facilities | tracon : iad.tracon tracon : m98.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude descent : vacating altitude |
| Route In Use | arrival star : jasen |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : iad.tracon |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 552930 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne critical inflight encounter : vfr in imc non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated faa : reviewed incident with flight crew |
| Miss Distance | vertical : 600 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Weather ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Dulles approach cleared us to descend from 11000 ft to 7000 ft inbound to jasen on arrival. I observed a converging target at 9600 ft on TCASII. As I started to shallow my descent on my own initiative, we received a TCASII RA which was followed, ending conflict. There was no traffic call from ATC, never saw aircraft visually. I believe we were on a collision course. I called TRACON supervisor who reviewed the tape and talked to controller, who said he saw the traffic but issued no warning as he believed there was no conflict. I'm uncomfortable with that in light of the TCASII RA and the fact that this occurred in poor visibility.
Original NASA ASRS Text
Title: IAD APCH CTLR DOES NOT ISSUE TFC TO A DSNDING B767 CREW BECAUSE HE FELT TFC WAS NOT A FACTOR.
Narrative: DULLES APCH CLRED US TO DSND FROM 11000 FT TO 7000 FT INBOUND TO JASEN ON ARR. I OBSERVED A CONVERGING TARGET AT 9600 FT ON TCASII. AS I STARTED TO SHALLOW MY DSCNT ON MY OWN INITIATIVE, WE RECEIVED A TCASII RA WHICH WAS FOLLOWED, ENDING CONFLICT. THERE WAS NO TFC CALL FROM ATC, NEVER SAW ACFT VISUALLY. I BELIEVE WE WERE ON A COLLISION COURSE. I CALLED TRACON SUPVR WHO REVIEWED THE TAPE AND TALKED TO CTLR, WHO SAID HE SAW THE TFC BUT ISSUED NO WARNING AS HE BELIEVED THERE WAS NO CONFLICT. I'M UNCOMFORTABLE WITH THAT IN LIGHT OF THE TCASII RA AND THE FACT THAT THIS OCCURRED IN POOR VISIBILITY.
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.