Narrative:

I was receiving VFR vectors from cleveland approach in the cle class B airspace to transition from the south side of the class B to bkl (burke lakefront airport) in the northern portion of the class B. Weather was VFR with continuous moderate to occasionally severe chop. Traffic was not a factor. No traffic was called to me and only one target (at 10 miles) showed on the adsb while in the class B. I was cleared at 3;500' with heading changes as necessary. The aircraft was on autopilot. At approximately ixore intersection; I hit some extreme turbulence. The aircraft rolled more that 90 degrees right; altitude increased violently; then decreased violently leaving a net gain of 600' and a heading deviation of 40 degrees right. This all happened simultaneously. The autopilot disconnected; whether from exceeding its limitations or my hand hitting the disconnect switch; I don't know. My first reaction was to roll level and then start a turn back to the proper heading and a descent down to the correct altitude. The controller asked if I needed any assistance. I declined as I was very busy. Back on heading and altitude; I explained to the controller what had happened.so far as I know; there was no loss of separation. However; for a few seconds I had absolutely no control over the aircraft. The experience was what I have always thought a wake turbulence encounter would be like; although I doubt that this was the case here because of the lack of other traffic.the one change I will make in my procedures because of this is to keep my seat belt even tighter.

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Original NASA ASRS Text

Title: PA-24 pilot reported loss of control for several seconds in severe turbulence that resulted in track and altitude excursions before control was regained.

Narrative: I was receiving VFR vectors from Cleveland Approach in the CLE Class B airspace to transition from the south side of the Class B to BKL (Burke Lakefront Airport) in the northern portion of the Class B. Weather was VFR with continuous moderate to occasionally severe chop. Traffic was not a factor. No traffic was called to me and only one target (at 10 miles) showed on the ADSB while in the Class B. I was cleared at 3;500' with heading changes as necessary. The aircraft was on autopilot. At approximately IXORE intersection; I hit some extreme turbulence. The aircraft rolled more that 90 degrees right; altitude increased violently; then decreased violently leaving a net gain of 600' and a heading deviation of 40 degrees right. This all happened simultaneously. The autopilot disconnected; whether from exceeding its limitations or my hand hitting the disconnect switch; I don't know. My first reaction was to roll level and then start a turn back to the proper heading and a descent down to the correct altitude. The Controller asked if I needed any assistance. I declined as I was very busy. Back on heading and altitude; I explained to the Controller what had happened.So far as I know; there was no loss of separation. However; for a few seconds I had absolutely no control over the aircraft. The experience was what I have always thought a wake turbulence encounter would be like; although I doubt that this was the case here because of the lack of other traffic.The one change I will make in my procedures because of this is to keep my seat belt even tighter.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.