Accident to the Cessna - U206 SUPER SKYWAGON registered F-HIDZ on 02/06/2020 at Gap-Tallard (Hautes-Alpes)

Cat. 2 investigation report: simplified-format report, adapted to the circumstances of the occurrence and the investigation stakes.

As part of the restoration work on the aeroplane started three years previously, the pilot, who was both co-director of FLY HIGH ICARIUS and deputy maintenance manager for ICARIUS AEROTECHNICS, carried out various tasks, including the installation of the new flight control cables. While carrying out this task - considered as critical - he had been uncertain about the correct routing of the cables and consulted the TEXTRON documentation, in particular the Service Manual. However, he wrongly interpreted the diagram containing illustrations which did not seem clear to him and incorrectly installed the aileron cables. He carried out the re-inspection himself without waiting for another approved inspector to be available. During this operation, he followed the flight control inspection sheet which did not stipulate to check the direction of movement of the controls, and he did not detect his error.
The technician then carried out the post-maintenance check flight himself. During the pre-flight check on the apron and when carrying out the pre-take-off checks at the holding point, he did not visually check for the correct direction of movement of the control surfaces, and in particular the ailerons. He thus did not realise that the roll control was reversed. During the take-off, he tried to counter a slight roll movement to the left by turning the control wheel to the right which amplified the bank angle of the aeroplane. Being close to the ground in a dynamic situation, he was unable to analyse that the control may be reversed.