 The crashed aircraft's left engine propeller blades went to 3 degrees instead of the commanded 79.2 degrees for feathering.The NTSB's final report, while acknowledging that Atlantic Southeast's practice of overworking pilots (it was estimated that the pilots only received 5 to 6 hours of sleep in violation of FARs) played no direct part in the accident, still raised concerns that the airline, along with other commuter airline corporations, "scheduled reduced rest periods for about 60 percent of the layovers in its day-to-day operations.The Safety Board believes that this practice is inconsistent with the level of safety intended by the regulations, which is to allow reduced rest periods as a contingency to a schedule disruption, and has the potential of adversely affecting pilot fitness and performance."