Cirrus Aircraft Undifferentiated
Flight Crew Instrument
Flight Crew Last 90 Days 10; Flight Crew Total 430; Flight Crew Type 430
Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Regained Aircraft Control
Environment - Non Weather Related; Procedure
I was flying with Instructor on PAPI for 14L at approximately 600 feet; well situated for landing; when I saw the Boeing Heavy on my right; it having come up behind us and to the right for parallel runway; and almost immediately; I felt huge wake turbulence. (I described it to pilot friend as herd of elephants stomping on right wing).  I was flying; Instructor was handling radio. We were at the end of the day after refresher training; something I do very regularly (approximately 2x per year. Plane lurched down dramatically and to the right.  Flight Instructor immediately took control. We were very close to ground pointed westward when pilot regained control and pulled it out.  ATC witnessed and later I spoke to ATC supervisor. Boeing has parallel runways; and we had not encroached on the approach for 14R.  There was a quartering tailwind; which I think caused the wake turbulence of the Heavy to drift over and down onto my plane. I didn't see the Heavy until right before turbulence hit. I knew it was in the general vicinity; but didn't know it was that close - it had been behind us and was on different radio.  We had hugged the shoreline prior to final approach because there was a plane at 1;200 feet not on radio circling Elliott Bay.
Cirrus pilot reported encountering wake turbulence on approach to BFI on a parallel approach with a Boeing Heavy that resulted in control difficulties at low altitude.