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Mlt Y climb to occupied altitude had less than standard separation from small transport X. System error.
| Attributes | |
| ACN | 241345 |
| Time | |
| Date | 199305 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : suu |
| State Reference | CA |
| Altitude | msl bound lower : 8000 msl bound upper : 8300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa tracon : suu |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Military Transport |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 2 |
| ASRS Report | 241345 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : flight data |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Intra Facility Coordination Failure |
Narrative:
Travis approach had a pointout on a slow climbing small transport X, enebound (040 degree bdg). Travis approach's airspace ceiling is 8000 ft. Mlt Y departed travis climbing to 8000 ft and a route change direct bebop intersection was approved by the radar assistant. As small transport X was leaving 8300 ft climbing to 13000 ft, I noticed mlt Y level at 8000 ft turned head-on with small transport X. I and the assistant assumed travis was going to provide visual with small transport X. At approximately 5 NM, head-on, mlt Y was put on my frequency. Small transport X was leaving 8400 ft. Mlt Y expedited climb through 9000 ft, climbing to FL230. Small transport X instructed to descend back to 8000 ft. 2 updates and mlt Y was leaving 9700 ft. Small transport X was leaving 8300 ft descending. Exact lateral and vertical separation at closest point unknown. I estimate between 3.5 to 4.0 NM laterally, and approximately 400-500 ft vertically.
Original NASA ASRS Text
Title: MLT Y CLB TO OCCUPIED ALT HAD LTSS FROM SMT X. SYS ERROR.
Narrative: TRAVIS APCH HAD A POINTOUT ON A SLOW CLBING SMT X, ENEBOUND (040 DEG BDG). TRAVIS APCH'S AIRSPACE CEILING IS 8000 FT. MLT Y DEPARTED TRAVIS CLBING TO 8000 FT AND A RTE CHANGE DIRECT BEBOP INTXN WAS APPROVED BY THE RADAR ASSISTANT. AS SMT X WAS LEAVING 8300 FT CLBING TO 13000 FT, I NOTICED MLT Y LEVEL AT 8000 FT TURNED HEAD-ON WITH SMT X. I AND THE ASSISTANT ASSUMED TRAVIS WAS GOING TO PROVIDE VISUAL WITH SMT X. AT APPROX 5 NM, HEAD-ON, MLT Y WAS PUT ON MY FREQ. SMT X WAS LEAVING 8400 FT. MLT Y EXPEDITED CLB THROUGH 9000 FT, CLBING TO FL230. SMT X INSTRUCTED TO DSND BACK TO 8000 FT. 2 UPDATES AND MLT Y WAS LEAVING 9700 FT. SMT X WAS LEAVING 8300 FT DSNDING. EXACT LATERAL AND VERT SEPARATION AT CLOSEST POINT UNKNOWN. I ESTIMATE BTWN 3.5 TO 4.0 NM LATERALLY, AND APPROX 400-500 FT VERTICALLY.
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.