Since the inception of Pan American’s jet operations, the JT-4 and JT-3 jet engines have logged over 1,200,000 engine hours. During the period of operation to December 1, 1961, a total of 2083 engines were changed. Seventy-eight per cent of the JT-4’s removed were planned, as were 71 per cent of JT-3 removals. The author discusses some of the experiences which have occurred in the use and overhaul of these engines.

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