Product-Improvement Test of Component TBO Extension, UH-1( ) Helicopter

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Product-Improvement Test of Component TBO Extension, UH-1( ) Helicopter

The majority of UH-1( ) dynamic components are replaced for overhaul or retirement at 1100-hour intervals. The UH-1( ) flying-hour program in the Republic of Vietnam (RVN) is 70 hours per month. Extension of the time between overhaul (TBO)of major dynamic components of the UH-1B and UH-1D Helicopters is highly desirable to improve the world-wide UH-1( ) supply posture and the availability rate of aircraft affected, and to provide substantial monetary savings. TBO extensions should be based only on experience gained from overhauls and from operation of sufficient number of test components beyond the authorized TBO. A UH-1( ) TBO Committee Meeting was held at the airframe manufacturer's plant on 25 and 26 March 1965 to examine the dynamic components removed at the completion of the logistical evaluation of the UH-1B Helicopter (Serial number 63-8659) at high takeoff gross weight, USATECOM Project No. 4-3-0100-08. It was decided at the meeting that the only UH-1( ) components suitable for a TBO extension program were: (1) Main-rotor hub assembly, P/N 204-011-101-9. (2) Intermediate (42-degree) gearbox, P/N 204-040-003-23. (3) Tail-rotor (90-degree) gearbox, P/N 204-040-012-7.