In subsequent correspondence between the NTSB and the Federal Aviation Administration (FAA), included in the final report, the NTSB questioned the then-available operating procedures and manuals for the aircraft. The NTSB found that there was insufficient guidance to pilots in the handling of "Cruise Pitch Lock Stuck" condition. For example, it was not clear based on existing instructions and guidelines whether a missed approach would be indicated and/or possible under these circumstances, and if so, what would be the recommended procedure to successfully execute the maneuver. Also, the condition of a shut down but unfeathered engine, i.e. windmilling propeller with high asymmetric drag and minimum control implications, which was encountered in this accident, was insufficiently covered, according to the NTSB.