Page:CAB Accident Report, United Airlines Flight 16.pdf/10

 full-feathering propellers. The right propeller hub had accumulated a total of about 6,471 hours and each of the blades about 1,135 hours. The left propeller hub and blades each had a total of about 6,447 hours.

The radio equipment installed in the airplane included four receivers, a radio range receiver (UAL) ES-198), a two-way plane to ground communication receiver (Western Electric type 12-a, modified), an auxiliary receiver (RGA type AVR-7A, modified) which could be used either for range reception or for reception on the company circuit, and an ultra-high frequency marker receiver (Western Electric type 27-A, modified). Also installed in the airplane were a receiving dynamotor (Eclipse type 80-2, model 2749), a transmitting dynamotor (Eclipse type 80-2325A), and a 50-watt radio telephone transmitter, (UAL ES-271). The transmitter was licensed by the Federal Communications Commission. The airplane was equipped with overhead and belly fixed antennae and also with a loop antenna. Head phones and microphones were provided for both the Captain and the First Officer and a switch arrangement was installed to that either or both could use any of the receivers. The airplane was also equipped with two of the anti-static discharge cartridges which had been developed and used by United Air Lines for the purpose of reducing precipitation static.

Compete de-icing equipment was installed on the airplane as well as a full complement of the necessary instruments required by the Civil Aeronautics Administration and by United. In addition, the airplane was equipped with the necessary facilities for providing oxygen for the passengers and crew. These included an oxygen bottle of 1,300 litres capacity with four outlets, one for use by the Captain, one for the First Officer, and two for the passenger compartment.