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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier came in close proximity to another aircraft at the same altitude resulting in less than standard separation.
| Attributes | |
| ACN | 128629 |
| Time | |
| Date | 198911 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bpi |
| State Reference | WY |
| Altitude | msl bound lower : 35600 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 4 |
| ASRS Report | 128629 |
| 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 | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 1400 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Operational Error Intra Facility Coordination Failure |
Narrative:
I was working air carrier X southbound along the east boundary of my sector. I was aware of traffic, cga Y, wbound, same altitude. Conflict (2 min) alert activated. I immediately called the controller working cga Y in the airspace (sector) east of me. He said he would move cga Y and provide sep. I hung up, satisfied. 30 seconds later, the other controller called me back and told me cga Y was NORDO! I asked if I could descend air carrier X to FL330 (he would enter that controller's airspace). He said no, he had cleared cga Y to FL330 and had gotten no reply. I was unaware of winds of 145 KTS from the northwest. I turned air carrier X left to an 080 degree heading. His original heading was 185 degrees. He turned and ground speed topped 650 KTS. I saw I would not have sep and cga Y had not left FL330. I cleared air carrier X to FL330. They passed with air carrier X at FL336, 3 mi north of cga Y.
Original NASA ASRS Text
Title: ACR CAME IN CLOSE PROX TO ANOTHER ACFT AT THE SAME ALT RESULTING IN LESS THAN STANDARD SEPARATION.
Narrative: I WAS WORKING ACR X SBND ALONG THE E BOUNDARY OF MY SECTOR. I WAS AWARE OF TFC, CGA Y, WBOUND, SAME ALT. CONFLICT (2 MIN) ALERT ACTIVATED. I IMMEDIATELY CALLED THE CTLR WORKING CGA Y IN THE AIRSPACE (SECTOR) E OF ME. HE SAID HE WOULD MOVE CGA Y AND PROVIDE SEP. I HUNG UP, SATISFIED. 30 SECS LATER, THE OTHER CTLR CALLED ME BACK AND TOLD ME CGA Y WAS NORDO! I ASKED IF I COULD DSND ACR X TO FL330 (HE WOULD ENTER THAT CTLR'S AIRSPACE). HE SAID NO, HE HAD CLRED CGA Y TO FL330 AND HAD GOTTEN NO REPLY. I WAS UNAWARE OF WINDS OF 145 KTS FROM THE NW. I TURNED ACR X LEFT TO AN 080 DEG HDG. HIS ORIGINAL HDG WAS 185 DEGS. HE TURNED AND GND SPD TOPPED 650 KTS. I SAW I WOULD NOT HAVE SEP AND CGA Y HAD NOT LEFT FL330. I CLRED ACR X TO FL330. THEY PASSED WITH ACR X AT FL336, 3 MI N OF CGA Y.
Data retrieved from NASA's ASRS site as of August 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.