Product Improvement Test, UH-1C Input End of the Mixing Lever and the Output End of the Scissors.

摘要

The UH-1( ) has undergone various test programs since initial procurement by the Army in an effort to improve the reliability and durability of the helicopter and the safety of personnel. At the 21 May 1967 UH-1( ) Product Improvement Program Conference at Bell Helicopter Company, the evaluation of certain improved Model 540 rotor components was proposed. Two UH-1C scissors and two mixing levers were modified by the installation of redesigned Shafer bearings (part number 540-011-415-1). Although outwardly appearing the same as the old bearings, the improved bearings have a closer tolerance between the ball and the bearing outer race, and incorporate a special parting agent between the ball and the Teflon which results in a burnished effect on the Teflon. The USAAVNTBD conducted this Category II product improvement test at Fort Rucker, Alabama, during the period 29 November 1967 through 19 June 1968. The mixing levers and scissors assembly, with redesigned bearings, were installed on UH-1C Helicopter, S/N 65-9445. During the test period, they were inspected in accordance with the aircraft organizational maintenance technical manual.