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A united states air carrier freighter in potential conflict with opposite direction traffic in a clearance to climb through occupied altitude.
| Attributes | |
| ACN | 254387 |
| Time | |
| Date | 199310 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : rktt |
| State Reference | FO |
| Altitude | msl bound lower : 19000 msl bound upper : 19500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : rktt |
| Operator | common carrier : air carrier |
| Make Model Name | Heavy Transport, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : other oceanic enroute : pacific |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 8000 flight time type : 4500 |
| ASRS Report | 254387 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : far other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : exited adverse environment other |
| Consequence | Other |
| Miss Distance | horizontal : 2500 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
On flight from seoul to anc, climbing on the airway to FL290, passing through FL185, tague control said we have traffic at 12 O'clock, 20 mi, opposite direction, 1000 ft above us. Since we were not instructed to level off, we took it to mean that other traffic was at FL300. At FL195, tague control told us to level at FL190 just as we spotted the traffic 500 ft above us at approximately FL200. When clear of other aircraft (other air carrier medium large transport) we were cleared to FL290. I believe the korean controller expected me to level off at some unspecified altitude until clear of the traffic, but his was not made clear by the controller (until it was almost too late). We managed to stop the climb at FL195 but had passed the other aircraft prior to descending to FL190.
Original NASA ASRS Text
Title: A UNITED STATES ACR FREIGHTER IN POTENTIAL CONFLICT WITH OPPOSITE DIRECTION TFC IN A CLRNC TO CLB THROUGH OCCUPIED ALT.
Narrative: ON FLT FROM SEOUL TO ANC, CLBING ON THE AIRWAY TO FL290, PASSING THROUGH FL185, TAGUE CTL SAID WE HAVE TFC AT 12 O'CLOCK, 20 MI, OPPOSITE DIRECTION, 1000 FT ABOVE US. SINCE WE WERE NOT INSTRUCTED TO LEVEL OFF, WE TOOK IT TO MEAN THAT OTHER TFC WAS AT FL300. AT FL195, TAGUE CTL TOLD US TO LEVEL AT FL190 JUST AS WE SPOTTED THE TFC 500 FT ABOVE US AT APPROX FL200. WHEN CLR OF OTHER ACFT (OTHER ACR MLG) WE WERE CLRED TO FL290. I BELIEVE THE KOREAN CTLR EXPECTED ME TO LEVEL OFF AT SOME UNSPECIFIED ALT UNTIL CLR OF THE TFC, BUT HIS WAS NOT MADE CLR BY THE CTLR (UNTIL IT WAS ALMOST TOO LATE). WE MANAGED TO STOP THE CLB AT FL195 BUT HAD PASSED THE OTHER ACFT PRIOR TO DSNDING TO FL190.
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.