In fact, after his post, I researched the accident database through AOPA’s site and did indeed see several Lancairs with inflight breakage or wing separation. I copied the summaries of two, below. There may be more…I just did not bother reading all the fatal reports. Indeed, if you abuse it enough, even a composite wing can be broken!
Eg, summary for N29ME, May 16, 2003, “The pilot was operating the airplane on an IFR flight plan into instrument meteorological conditions in an area of known thunderstorms with severe turbulence. The airplane disappeared from radar coverage and was located in a wheat field by Sheriff Department personnel. The airplane sustained an in-flight airframe breakup. Airframe components recovered from the accident site were submitted to the NTSB Material Laboratory for examination. The examination revealed all failures were due to overload. Examination of the airframe revealed the airframe design limits were exceeded. The pilot received several preflight briefings through the use of the DUAT system. The products used forecasted thunderstorm activity along the route of flight and the pilot received Convective SIGMET’s and Central Weather Advisories warning of developing thunderstorms.”
And N102JL, on October 13, 1995, “The noninstrument-rated pilot filed for and received an instrument flight plan clearance from Atlanta to Boca Raton, Florida. The weather at the time of the accident was IMC. Transcripts of radio communications indicated that the pilot was having problems maintaining altitude and heading. Shortly after departure the pilot reported that he thought that one of the aircraft gyros was not operating properly. He later reported that he believed the problem had corrected itself. Witnesses observed the aircraft descend out of the base of the clouds and break up in flight.”