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B787 captain reported a track deviation in oceanic airspace while avoiding a thunderstorm without informing ATC.
| Attributes | |
| ACN | 1389677 |
| Time | |
| Date | 201609 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B787 Dreamliner Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 20 Flight Crew Total 6556 Flight Crew Type 52 |
| Events | |
| Anomaly | Deviation - Procedural Clearance Deviation - Track / Heading All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
Saw cu/trw visually many miles ahead; radar was on/operating on both displays. Showed no return at the time. As we approached the cu/trw we pulled down the huds to check our track and heading against the location of the cu. It appeared that we would pass to the left/south of the buildup. Continued to monitor the radar and getting small to no returns.first officer flying pilot left the flight deck for physiologic reasons. I continued to monitor the aircraft and radar. Approx 30 miles from the cu/trw the radar; in about 4 or 5 sweeps; suddenly showed a large area of red return and our flight path was through the return.I turned to the right/north as it was the shortest distance to avoid the WX; attempting to stay within the 3 miles slop limit. That did not offer enough clearance from the WX. Seat belt sign was turned on. Checked TCAS for traffic near us and there was none. I turned further to the right to avoid WX.we passed the WX with moderate chop; no hail but had possible ice crystals present briefly. No change in engine performance. Ended up 8 miles off course to the right/north and once clear of WX turned back to course/track. Time off course was approximately 10 minutes. We crossed the next fix within 3 minutes of ETA so no update was sent.
Original NASA ASRS Text
Title: B787 Captain reported a track deviation in oceanic airspace while avoiding a thunderstorm without informing ATC.
Narrative: Saw CU/TRW visually many miles ahead; radar was on/operating on both displays. Showed no return at the time. As we approached the CU/TRW we pulled down the HUDs to check our track and heading against the location of the CU. It appeared that we would pass to the left/south of the buildup. Continued to monitor the radar and getting small to no returns.FO Flying pilot left the flight deck for physiologic reasons. I continued to monitor the aircraft and radar. Approx 30 miles from the CU/TRW the radar; in about 4 or 5 sweeps; suddenly showed a large area of red return and our flight path was through the return.I turned to the right/north as it was the shortest distance to avoid the WX; attempting to stay within the 3 miles SLOP limit. That did not offer enough clearance from the WX. Seat belt sign was turned on. Checked TCAS for traffic near us and there was none. I turned further to the right to avoid WX.We passed the WX with moderate chop; no hail but had possible ice crystals present briefly. No change in engine performance. Ended up 8 miles off course to the right/north and once clear of WX turned back to course/track. Time off course was approximately 10 minutes. We crossed the next fix within 3 minutes of ETA so no update was sent.
Data retrieved from NASA's ASRS site 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.