 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
ARTCC radar controller released control of large transport for right turn and descent to adjacent sector, without pointing out conflicting traffic. Less than standard separation occurred.
| Attributes | |
| ACN | 194970 |
| Time | |
| Date | 199111 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hbu |
| State Reference | CO |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 4 controller radar : 3 |
| ASRS Report | 194970 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Intra Facility Coordination Failure |
Narrative:
I called sector 4 with plan to descend large transport X to FL310 for traffic. They requested control for right turn and descent on same aircraft. I did not reference an overflt. I had medium large transport Y that I thought was no factor and would cross 20-25 mi behind at FL350. The large transport X flight was on a heading of 315 degrees and sector 4 on contact turned large transport X to 020 degrees heading for spacing (65 degree right turn). We also had winds of 310 degrees at 100 KTS at the time. A min later I noticed large transport X was turning into medium large transport Y. I instructed medium large transport Y to turn 50 degrees left immediately, then called sector 4 to turn large transport X immediately. Conflict alert never went off! Separation lost. I never expected sector 4 controller to turn large transport X 65 degrees to right. With the strong winds the end result of the turn was almost 90 degrees (excessive).
Original NASA ASRS Text
Title: ARTCC RADAR CTLR RELEASED CTL OF LGT FOR R TURN AND DSCNT TO ADJACENT SECTOR, WITHOUT POINTING OUT CONFLICTING TFC. LTSS OCCURRED.
Narrative: I CALLED SECTOR 4 WITH PLAN TO DSND LGT X TO FL310 FOR TFC. THEY REQUESTED CTL FOR R TURN AND DSCNT ON SAME ACFT. I DID NOT REF AN OVERFLT. I HAD MLG Y THAT I THOUGHT WAS NO FACTOR AND WOULD CROSS 20-25 MI BEHIND AT FL350. THE LGT X FLT WAS ON A HDG OF 315 DEGS AND SECTOR 4 ON CONTACT TURNED LGT X TO 020 DEGS HDG FOR SPACING (65 DEG R TURN). WE ALSO HAD WINDS OF 310 DEGS AT 100 KTS AT THE TIME. A MIN LATER I NOTICED LGT X WAS TURNING INTO MLG Y. I INSTRUCTED MLG Y TO TURN 50 DEGS L IMMEDIATELY, THEN CALLED SECTOR 4 TO TURN LGT X IMMEDIATELY. CONFLICT ALERT NEVER WENT OFF! SEPARATION LOST. I NEVER EXPECTED SECTOR 4 CTLR TO TURN LGT X 65 DEGS TO R. WITH THE STRONG WINDS THE END RESULT OF THE TURN WAS ALMOST 90 DEGS (EXCESSIVE).
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.