Citation Excel (C560XL)
Flight Crew Air Transport Pilot (ATP)
Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Wake Vortex Encounter
Aircraft Aircraft Damaged; Flight Crew Regained Aircraft Control
Chart Or Publication; Environment - Non Weather Related; Procedure
While flying the Fern5 arrival into SMO; descending thru FL370; we experienced severe wake turbulence from another aircraft in front of us. Believe [the aircraft] to be an A380; on the SADDE6 arrival to LAX. The event took place between REBRG and DERBB intersection with ATC reporting the A380 'super' was 15 NM ahead of us and descending. The aircraft upset was an abrupt negative g's; followed immediately by a right roll to 90+ degrees. Then; quickly brought the plane back to a level attitude; assessed PAX injuries; aircraft control in approach/landing configurations; and if any structural damage. No serious injuries; and aircraft integrity was verified. Continued to destination due to close proximity of all diverts (VNY; BUR; LAX). We [advised ATC of a medical issue with a passenger]; as a precaution; to have PAX checked out by medical personnel upon arrival. They were examined and released to go home within 10 MINS.The Fern5 and SADDE6 converge and share fixes at DERBB; REYES and FIM. No altitude restrictions on either arrival. The Fern5 is tailored for smaller GA aircraft and SADDE6 tends to be larger commercial aircraft. These two arrivals should not converge; share fixes; and [they should] have altitude crossing restrictions. ATC should also be aware of these conflicts and not allow 'heavies [and] supers' to be descending thru this airspace [without] much; much greater lateral and vertical separation.
Aircraft flying into LAX on the SADDE6 arrival cross over three shared points with smaller jets flying the FERN5 arrival into VNY; BUR & SMO. Seems very inappropriate to have heavy jetliners passing over smaller business jets on these two STARs. ATC should have [kept] us informed as to the location of the A380 and warned us about the possibility of wake turbulence. We couldn't even see the A380 that produced the turbulence. He had passed us 15-20 minutes before the event. These two arrivals should not share any common points with each other. Heavy aircraft (especially a 'Super') should be further away from smaller jets even in cruise flight.
C560XL flight crew reported an upset when they encountered 'severe' wake turbulence from a preceding A380 on arrival into the LAX basin.