 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A B777-204 descending on the sayge arrival to den responds to a TCASII RA resulting from a conflict with traffic at 16000 ft that apparently was not under control of ATC.
| Attributes | |
| ACN | 626310 |
| Time | |
| Date | 200408 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : witne |
| State Reference | CO |
| Altitude | msl single value : 16200 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv.artcc tower : cae.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdv.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 15000 flight time type : 800 |
| ASRS Report | 626310 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 16 flight time total : 4800 flight time type : 800 |
| ASRS Report | 626182 |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | aircraft equipment : tcas other controllerb other flight crewa other flight crewb |
| Resolutory Action | controller : issued advisory flight crew : took evasive action |
| Miss Distance | horizontal : 5000 vertical : 200 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Airspace Structure ATC Human Performance |
| Primary Problem | Ambiguous |
Narrative:
On the sayge 4 arrival into denver we were given a clearance to 13000 ft. While passing through approximately 17000 ft, the controller said he had conflicting traffic and did not know its intentions. He gave us an approximately 45 degree turn to the right which put us in direct conflict with the intruding traffic. I noticed that he was at 16000 ft as we were passing through 16500 ft. I told the PNF to climb and almost at the same time the controller told us to climb as we got a climb RA. We descended to 16200 ft before the aircraft started to climb as we had also stopped our turn during the climb. Supplemental information from acn 626182: he gave us a turn to 280 degrees, which turned us directly into the traffic. The traffic was a TA at this point but within seconds turned to an RA. I immediately responded to the RA and climbed to approximately 16800 ft. I could clearly see the other aircraft at our altitude maneuvering to turn away from us. He was climbing out of den through the arrival sector. We passed at what I estimate to be less than a mi.
Original NASA ASRS Text
Title: A B777-204 DSNDING ON THE SAYGE ARR TO DEN RESPONDS TO A TCASII RA RESULTING FROM A CONFLICT WITH TFC AT 16000 FT THAT APPARENTLY WAS NOT UNDER CTL OF ATC.
Narrative: ON THE SAYGE 4 ARR INTO DENVER WE WERE GIVEN A CLRNC TO 13000 FT. WHILE PASSING THROUGH APPROX 17000 FT, THE CTLR SAID HE HAD CONFLICTING TFC AND DID NOT KNOW ITS INTENTIONS. HE GAVE US AN APPROX 45 DEG TURN TO THE R WHICH PUT US IN DIRECT CONFLICT WITH THE INTRUDING TFC. I NOTICED THAT HE WAS AT 16000 FT AS WE WERE PASSING THROUGH 16500 FT. I TOLD THE PNF TO CLB AND ALMOST AT THE SAME TIME THE CTLR TOLD US TO CLB AS WE GOT A CLB RA. WE DSNDED TO 16200 FT BEFORE THE ACFT STARTED TO CLB AS WE HAD ALSO STOPPED OUR TURN DURING THE CLB. SUPPLEMENTAL INFO FROM ACN 626182: HE GAVE US A TURN TO 280 DEGS, WHICH TURNED US DIRECTLY INTO THE TFC. THE TFC WAS A TA AT THIS POINT BUT WITHIN SECONDS TURNED TO AN RA. I IMMEDIATELY RESPONDED TO THE RA AND CLBED TO APPROX 16800 FT. I COULD CLRLY SEE THE OTHER ACFT AT OUR ALT MANEUVERING TO TURN AWAY FROM US. HE WAS CLBING OUT OF DEN THROUGH THE ARR SECTOR. WE PASSED AT WHAT I ESTIMATE TO BE LESS THAN A MI.
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.