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Less than standard separation when 2 air carrier's meet at high altitude on over ocean airways at same altitude.
| Attributes | |
| ACN | 92020 |
| Time | |
| Date | 198808 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hcn |
| State Reference | FO |
| Altitude | msl bound lower : 39000 msl bound upper : 39000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : rctp tower : sju |
| 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 oceanic enroute : pacific enroute airway : rctp |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : other oceanic enroute : pacific |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 7000 |
| ASRS Report | 92020 |
| Person 2 | |
| Affiliation | Other |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
After making turn over hengchun VOR via G581 to hong kong, encountered other aircraft at same altitude, proceeding southbound on A577 (crossing point parpa intersection). Made right turn off arwy for avoidance, passing within approximately 2 mi of other aircraft. The controller on duty was then changed and he said they had at least 5 mi of sep from other aircraft. The other aircraft confirmed the close proximity of the 2 aircraft and saw us take evasive action. Callback conversation with reporter revealed the following: no follow up contact was made with the center in taipei by telephone. After this incident took place, with a female controller talking on the radio, the controller was removed and a male voice told the reporter that the other aircraft was really 5 mi away and that sep was not lost. On the radio later, reporter had a conversation with the flight crew of the other aircraft, and both agreed that sep was no more than 2 mi and possibly even less. Reporter said that his evasive turn was probably not necessary, but he did not feel like taking chances at that point. The courses of the aircraft were nearly perpendicular, with reporter's aircraft proceeding eastbound and the other aircraft southbound.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION WHEN 2 ACR'S MEET AT HIGH ALT ON OVER OCEAN AIRWAYS AT SAME ALT.
Narrative: AFTER MAKING TURN OVER HENGCHUN VOR VIA G581 TO HONG KONG, ENCOUNTERED OTHER ACFT AT SAME ALT, PROCEEDING SBND ON A577 (XING POINT PARPA INTXN). MADE R TURN OFF ARWY FOR AVOIDANCE, PASSING WITHIN APPROX 2 MI OF OTHER ACFT. THE CTLR ON DUTY WAS THEN CHANGED AND HE SAID THEY HAD AT LEAST 5 MI OF SEP FROM OTHER ACFT. THE OTHER ACFT CONFIRMED THE CLOSE PROX OF THE 2 ACFT AND SAW US TAKE EVASIVE ACTION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: NO FOLLOW UP CONTACT WAS MADE WITH THE CENTER IN TAIPEI BY TELEPHONE. AFTER THIS INCIDENT TOOK PLACE, WITH A FEMALE CTLR TALKING ON THE RADIO, THE CTLR WAS REMOVED AND A MALE VOICE TOLD THE RPTR THAT THE OTHER ACFT WAS REALLY 5 MI AWAY AND THAT SEP WAS NOT LOST. ON THE RADIO LATER, RPTR HAD A CONVERSATION WITH THE FLT CREW OF THE OTHER ACFT, AND BOTH AGREED THAT SEP WAS NO MORE THAN 2 MI AND POSSIBLY EVEN LESS. RPTR SAID THAT HIS EVASIVE TURN WAS PROBABLY NOT NECESSARY, BUT HE DID NOT FEEL LIKE TAKING CHANCES AT THAT POINT. THE COURSES OF THE ACFT WERE NEARLY PERPENDICULAR, WITH RPTR'S ACFT PROCEEDING EBND AND THE OTHER ACFT SBND.
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.