Product Improvement Test of Tail-Rotor Drive-Shaft Hanger Bearings (Part Number P9107NPP).

摘要

In CY 1967, the US Army Aviation Test Board (USAAVNTBD) tested a product-improvement tail-rotor drive-shaft hanger bearing (Bell P/N 204-040-623, Fafnir P/N 9107PP). The Army has obtained 2,400 bearings, P/N P9107NPP, which are similar to both the old hanger bearing, P/N 204-040-615, and the product-improvement bearing, P/N 204-040-623. Because of the large number of bearings involved, the US Army Aviation Materiel Command requested a test of four P9107NPP bearings on a UH-1H Helicopter. US Army Test and Evaluation Command directed the USAAVNTBD to conduct the test. The USAAVNTBD conducted the product improvement test of the P9107NPP bearings at Fort Rucker, Alabama, during the period 26 June 1967 to 18 March 1968. Four test bearings were installed on one UH-1H Helicopter. Accumulated time on bearings and difficulties were recorded.