Product Improvement Test of UH-1D Main Rotor Grip Seals

Abstract

Since the beginning of the UH-1 series helicopter, oil leakage around the main rotor grip seals has been a constant service problem. The seals have been modified three different times in a attempt to correct this problem. In February 1965, USAAVCOM approved PIP Task 5B5 with the objective of eliminating the problem. This task resulted in Engineering Change Proposal UH-1B/D/E/F-236. USAAVCOM requested through USATECOM that the USAAVNTBD test the modified seal configuration specified in the ECP. For direct comparison between the standard and the modified seal configurations, the modified seal was installed on one side of a UH-1D main rotor hub and the other side of the hub was left in the standard configuration. One side of the modified main rotor hub, P/N 204-012- 101-1, contains a P/N MS29561-240 'O' ring on the inboard fitting, a P/N MS29561-237 'O' ring on the outboard fitting, aluminum caps to the strap pins, and a radius ring containing a rubber shield to protect the grip seal. The other side of this hub was the same as a standard, 48-foot rotor UH-1D hub, P/N 204- 012-101.

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Document Details

Document Type
Technical Report
Publication Date
Jan 14, 1967
Accession Number
ADA030923

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  • Aerodynamics.
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