A high-stop hang-up of both propellers occurred during a simulated stall maneuver, resulting in excessive turbine temperatures and subsequent engine failure. The crew’s attempts to recover from the stall failed, leading to a crash-landing in the desert. Excessive wear on propeller hub contact switches was a contributing factor, exacerbated by inadequate maintenance and inspection procedures. Improper operation of the powerplant and controls, coupled with insufficient supervision, contributed to the incident. The incident was likely triggered by a combination of factors including engine failure, miscellaneous acts, and conditions like excessive temperature.A high-stop hang-up of both propellers occurred during a simulated stall maneuver, resulting in excessive turbine temperatures and subsequent engine failure. The crew’s attempts to recover from the stall failed, leading to a crash-landing in the desert. Excessive wear on propeller hub contact switches was a contributing factor, exacerbated by inadequate maintenance and inspection procedures. Improper operation of the powerplant and controls, coupled with insufficient supervision, contributed to the incident. The incident was likely triggered by a combination of factors including engine failure, miscellaneous acts, and conditions like excessive temperature.