Today, the NTSB released its preliminary accident reporton the May 31, 2014, fatal accident of a Gulfstream G-IV at Hanscom Field, Bedford, Mass.-it stated that although the mechanical control lock was in the off position, the Fight Data Recorder (FDR) indicated the elevator position throughout the event was consistent with the control lock being engaged. Review of FDR data parameters associated with the flight control surface positions did not reveal any movement consistent with a flight control check prior to the commencement of the takeoff roll. However, the control lock handle, located on the right side of the control pedestal, was found in the forward (off) position, and the elevator control lock latch was found not engaged.
This is a companion discussion topic for the original entry at https://www.avweb.com/news/hanscom-g-iv-crash-controls-locked