EMB ERJ 170/175 ER/LR
Flight Crew Air Transport Pilot (ATP)
Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Issued New Clearance; Flight Crew Regained Aircraft Control; Flight Crew Took Evasive Action
Environment - Non Weather Related; Procedure
While in the downwind for runway 24R in LAX; we were sequenced behind a 747. We were provided 7 miles of separation from the traffic. While descending through 6;000 feet we encountered wake turbulence. The aircraft rolled right; then left; then right over a 10-15 second period. I do not know what the bank or pitch angles were; but we heard 'BANK ANGLE' from the aircraft. The captain; who was the pilot flying; provided full aileron control inputs in both directions to the stops; and in both cases the aircraft continued to bank in the direction opposite of the aileron correction. The wake turbulence was; in a word; severe. We asked for; and received; an altitude above where the 747 leveled off; and a heading off the SMO 068 radial. We landed uneventfully and wrote the aircraft up for severe turbulence; whereupon maintenance performed a successful inspection of the aircraft; and we continued to operate the aircraft for the remainder of the day. The controller in this case provided more than adequate separation; and I believe the wake turbulence encounter was due to a fluke of atmospheric conditions. Put simply; we should have never flown through the 747's wake.The captain; as pilot flying; performed a flawless; textbook; wake turbulence recovery. The event; and recovery; mirrored perfectly that which we see in the simulator.
EMB-175 First Officer reported encountering 'severe' wake turbulence seven miles in trail of a B747 on a visual approach to LAX.