Gulfstream G-IV flight crew reported a significant wake turbulence encounter on arrival into LAX in trail of a B787.
Synopsis
Gulfstream G-IV flight crew reported a significant wake turbulence encounter on arrival into LAX in trail of a B787.
Narrative
We were about to begin the descent from 7000 to 5000 about 5NM south of TRNDO; an IF for the ILS 25L LAX. We were following a B787 about 5 miles ahead of us. They never appeared to be above our flight path. Just as we were instructed to begin descent; we encountered significant wake turbulence. The airplane rolled 40 degrees right followed by a 30 degree left wing low roll. The autopilot disconnected and we received FGC (Flight Guidance Computer) 1-2 fail annunciation. The airplane also climbed about 400ft. We immediately advised ATC of the encounter and asked for time to work the problem. The flight was given a vector. PIC took controls while SIC ran the FGC 1-2 fail checklist. After resetting both CBs (Circuit Breakers); the autopilot initially appeared operative but then tripped off with a FGC1 fail. The crew switched to FGC2 which worked fine for the remainder of the flight. The flight was given a vector to intercept the ILS and the rest of the flight was uneventful. Both FGCs worked fine when checked after landing and for the rest of the day.
Second reporter narrative
[Report narrative contained no additional information.]
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.