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B777 captain reports deviating around weather using his emergency authority when ATC clearance cannot be received in a timely manner.
| Attributes | |
| ACN | 977475 |
| Time | |
| Date | 201110 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | RJTG.ARTCC |
| State Reference | FO |
| Aircraft 1 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 12900 Flight Crew Type 2500 |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Track / Heading All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
At FL350 we were flying in an area of thunderstorms that were briefed to be way below us. Our radar was on; with about 1 degree down tilt. There were several lightning flashes below us; but nothing showing on the radar ahead. Then a couple lightning flashes showed a very dark shape towering ahead of us 30-40 NM. As soon as I touched the radar tilt; the cells appeared on the nd. I immediately requested cpdlc with tokyo a right deviation 20 NM south of track for weather; followed immediately with a request for 30 NM deviation south of track. They did not get back to us in time; so I used my emergency authority to deviate south of track. We checked our TCAS; no one was around; and our lights were on. We deviated about 16 miles right of track; during which we received a cpdlc message from tokyo that we were ok to deviate up to 30 NM right of track for weather. After passing the large cell; we returned to track and had no further issues with the deviation.
Original NASA ASRS Text
Title: B777 Captain reports deviating around weather using his emergency authority when ATC clearance cannot be received in a timely manner.
Narrative: At FL350 we were flying in an area of thunderstorms that were briefed to be way below us. Our radar was on; with about 1 degree down tilt. There were several lightning flashes below us; but nothing showing on the radar ahead. Then a couple lightning flashes showed a very dark shape towering ahead of us 30-40 NM. As soon as I touched the radar tilt; the cells appeared on the ND. I immediately requested CPDLC with Tokyo a right deviation 20 NM south of track for weather; followed immediately with a request for 30 NM deviation south of track. They did not get back to us in time; so I used my emergency authority to deviate south of track. We checked our TCAS; no one was around; and our lights were on. We deviated about 16 miles right of track; during which we received a CPDLC message from Tokyo that we were OK to deviate up to 30 NM right of track for weather. After passing the large cell; we returned to track and had no further issues with the deviation.
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.