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for instrument flight navigation, including radio range receiver, communication receiver, marker receiver, communication transmitter and an automatic direction finder system. The aircraft was powered with four Wright GR-1820G-105A engines, equipped with two-stage superchargers, manufactured by the Wright Aeronautical Corporation, Patterson, New Jersey. Each engine was rated at 900 horse power. The propellers installed on the aircraft were the hydromatic full-feathering type with constant speed control and were manufactured by the Hamilton Standard Propellers Division of United Aircraft Corporation, East Hartford, Connecticut. The aircraft had a total operating time of 133 hours and 12 minutes, while the engines and propellers had a total operating time of approximately 87 hours.[1]
Captain Otis. F. Bryan, aged 32, who was in command of the flight at the time of the accident, had a total flying time of 9412 hours and 13 minutes, approximately 126 hours and 47 minutes of which had been in Boeing 307-B's. Captain F. G. Richardson, aged 37, First Officer on the flight involved, at the time of the accident had a total flying time of 11,177 hours and 19 minutes, approximately 9 hours and 8 minutes of which had been accumulated as copilot on Boeing 307-B's. Both airmen possessed the required ratings and certificates of competency required for the equipment involved. Richard R. deCampo and L. E. Hubbard were assigned to the flight
- ↑ The G102 engines originally installed on the airplane were later changed for the G105-A, which were designed to give greater performance at higher altitudes.
