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ZLA controller experienced loss of separation at FL270 when vectoring traffic behind another aircraft misjudging the required distance.
| Attributes | |
| ACN | 705703 |
| Time | |
| Date | 200607 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : pmd.vortac |
| State Reference | CA |
| Altitude | msl single value : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | general aviation : personal |
| Make Model Name | Gulfstream IV |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | general aviation : personal |
| Make Model Name | Premier 1 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 18 controller time certified in position1 : 16 |
| ASRS Report | 705703 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Miss Distance | horizontal : 25238 vertical : 800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
Gulfstream aircraft was sebound at FL270. Premier aircraft Y was nwbound climbing up to FL400. I observed that aircraft Y would not pass behind aircraft X; as I previously planned; so I issued aircraft Y a left turn. Aircraft Y did not respond. I issued aircraft X a left turn; which he complied with. Aircraft passed 4.78 mi apart. Our separation minima is 5 mi.
Original NASA ASRS Text
Title: ZLA CTLR EXPERIENCED LOSS OF SEPARATION AT FL270 WHEN VECTORING TFC BEHIND ANOTHER ACFT MISJUDGING THE REQUIRED DISTANCE.
Narrative: GULFSTREAM ACFT WAS SEBOUND AT FL270. PREMIER ACFT Y WAS NWBOUND CLBING UP TO FL400. I OBSERVED THAT ACFT Y WOULD NOT PASS BEHIND ACFT X; AS I PREVIOUSLY PLANNED; SO I ISSUED ACFT Y A L TURN. ACFT Y DID NOT RESPOND. I ISSUED ACFT X A L TURN; WHICH HE COMPLIED WITH. ACFT PASSED 4.78 MI APART. OUR SEPARATION MINIMA IS 5 MI.
Data retrieved from NASA's ASRS site as of January 2009 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.