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A B777 over the pacific deviated 15 mi off course after being denied clearance to maneuver around thunderstorms.
| Attributes | |
| ACN | 706290 |
| Time | |
| Date | 200608 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : rjtg.artcc |
| State Reference | FO |
| Altitude | msl single value : 35000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Rain Thunderstorm |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : rjtg.artcc tower : rsw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute : pacific |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 706290 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | inflight encounter : weather non adherence : clearance other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended or assigned course |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Ambiguous |
Narrative:
Deviated to south (right) of course up to 15.6 mi in order to avoid line of thunderstorms on assigned track. Clearance to deviate was denied from both tokyo and sfo. We would have had to fly right through storm (cells) if we had not deviated. Came close to declaring an emergency; but did not because I did not think I would end up that far off track. Should have declared an emergency when forced to deviate without clearance.
Original NASA ASRS Text
Title: A B777 OVER THE PACIFIC DEVIATED 15 MI OFF COURSE AFTER BEING DENIED CLRNC TO MANEUVER AROUND TSTMS.
Narrative: DEVIATED TO S (R) OF COURSE UP TO 15.6 MI IN ORDER TO AVOID LINE OF TSTMS ON ASSIGNED TRACK. CLRNC TO DEVIATE WAS DENIED FROM BOTH TOKYO AND SFO. WE WOULD HAVE HAD TO FLY RIGHT THROUGH STORM (CELLS) IF WE HAD NOT DEVIATED. CAME CLOSE TO DECLARING AN EMER; BUT DID NOT BECAUSE I DID NOT THINK I WOULD END UP THAT FAR OFF TRACK. SHOULD HAVE DECLARED AN EMER WHEN FORCED TO DEVIATE WITHOUT CLRNC.
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.