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Air carrier X had less than standard longitudinal separation from air carrier Y in oceanic control airspace. System error.
| Attributes | |
| ACN | 204045 |
| Time | |
| Date | 199203 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pye |
| State Reference | CA |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : non radar |
| Qualification | controller : non radar |
| Experience | controller non radar : 2 |
| ASRS Report | 204045 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| 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 : 99000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X on route from klax to rjaa at FL310, requested climb to FL350. A traffic check was accomplished and it was determined that FL350 was not available due to traffic 4 min in-trail. A further check indicated that FL330 was available. A climb clearance was issued to FL330. During a sector relief briefing, the relieving controller noticed that air carrier X and air carrier Y had only 8 min longitudinal separation vice the required 10 mins. Air carrier X was descended to FL310 and separation was regained at XX14 Z when the aircraft reported level.
Original NASA ASRS Text
Title: ACR X HAD LESS THAN STANDARD LONGITUDINAL SEPARATION FROM ACR Y IN OCEANIC CTL AIRSPACE. SYS ERROR.
Narrative: ACR X ON RTE FROM KLAX TO RJAA AT FL310, REQUESTED CLB TO FL350. A TFC CHK WAS ACCOMPLISHED AND IT WAS DETERMINED THAT FL350 WAS NOT AVAILABLE DUE TO TFC 4 MIN IN-TRAIL. A FURTHER CHK INDICATED THAT FL330 WAS AVAILABLE. A CLB CLRNC WAS ISSUED TO FL330. DURING A SECTOR RELIEF BRIEFING, THE RELIEVING CTLR NOTICED THAT ACR X AND ACR Y HAD ONLY 8 MIN LONGITUDINAL SEPARATION VICE THE REQUIRED 10 MINS. ACR X WAS DSNDED TO FL310 AND SEPARATION WAS REGAINED AT XX14 Z WHEN THE ACFT RPTED LEVEL.
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.