B787 Captain and F/O reported encountering wake turbulence in trail of an A380 in cruise flight at FL360.
Synopsis
B787 Captain and F/O reported encountering wake turbulence in trail of an A380 in cruise flight at FL360.
Narrative
We were flying on PACOT East 2 track at F350; 19 miles behind another aircraft at FL370. We attempted voice contact with them on XXX.XX frequency to get a ride report but got no response. We were SLOPed 1.5 NM right and the aircraft ahead had zero SLOP (Strategic Lateral Offset Procedure). Winds were from left; slightly aft; at 43 kts. We had been held down because of this aircraft and wanted to climb do burn less fuel. We were off our altitude profile. We discussed climbing to FL360 as we didn't think wake turbulence would be a factor. We climbed to FL360 and within a few minutes encountered what we thought was severe clear turbulence with some rolling motions about 10 degrees. We sat the flight attendants immediately according to turbulence procedures. We requested a descent back to FL350 because it had been smooth. We sent a PIREP of severe turbulence and discussed what might have caused this. WSI and the radar didn't indicate any turbulence possibilities. We re-attempted contact with the aircraft ahead and it was an A380 Super. The light bulb came on that it was probably wake turbulence due to our 1.5 NM offset; 1;000 ft below; and winds from the left at 40kts-ish. We immediately zeroed out the SLOP. After a bit of time it was night time and the 3/4 moon came up and we were eventually able to see [the A380's] contrails. We asked them to offset right while we stayed zero SLOP.
Second reporter narrative
At FL350 climbed to FL360. Suddenly encountered severe turbulence. Made PA announcement for Flight Attendants (FA) to seated immediately. Requested descent back down to FL350. Clearance received after about 1 minute; descended to FL350. Turbulence decreased. Made PA for FA to take jump seats. After about 5 minutes; determined it was safe and made PA for FA to check in. No injuries were reported.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.