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An air carrier crew declared an emergency and diverted off an oceanic track at FL360 after departing; ATC would not permit track deviation for weather avoidance.
| Attributes | |
| ACN | 836389 |
| Time | |
| Date | 200905 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 18000 Flight Crew Type 2700 |
| Events | |
| Anomaly | Deviation - Procedural Clearance Deviation - Track / Heading All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
Flying at FL360. SIGMET for severe weather was active in the area. Onboard weather radar was painting yellow targets on track and tops to approximately FL380 were visible at 12 O'clock. Via cpdlc to center deviations were requested in order L20; R20; L10. All were rejected. We were informed by center that right deviations might be available in about 10 minutes. Using captains emergency authority after our 3rd deviation request was rejected; we deviated 10L to avoid a thunderstorm. Exterior lites were turned on; FL360 was maintained and our position was broadcast. Center was informed of our actions via cpdlc. Total time of deviation was no more than 5 minutes. Center was informed when we returned to course via cpdlc and the flight then proceeded to destination without further incident.
Original NASA ASRS Text
Title: An air carrier crew declared an emergency and diverted off an oceanic track at FL360 after departing; ATC would not permit track deviation for weather avoidance.
Narrative: Flying at FL360. SIGMET for severe weather was active in the area. Onboard weather radar was painting yellow targets on track and tops to approximately FL380 were visible at 12 O'clock. Via CPDLC to Center deviations were requested in order L20; R20; L10. All were rejected. We were informed by Center that right deviations might be available in about 10 minutes. Using Captains emergency authority after our 3rd deviation request was rejected; we deviated 10L to avoid a thunderstorm. Exterior lites were turned on; FL360 was maintained and our position was broadcast. Center was informed of our actions via CPDLC. Total time of deviation was no more than 5 minutes. Center was informed when we returned to course via CPDLC and the flight then proceeded to destination without further incident.
Data retrieved from NASA's ASRS site as of April 2012 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.