T-55 Engine Compressor Stator Vane Investigation

Report No. ARL-TR-2123
Authors: Grendahl, Scott M.
Date/Pages: November 1999; 69 pages
Abstract: The U.S. Army Aviation and Missile Command (AMCOM) requested the U.S. Army Research Laboratory Weapons and Materials Research Directorate (ARL-WMRD) investigate a corrosion problem with T-55 engine stators. This investigation was part of a second source vendor qualification in which a specific vendor was failing the engine test due to significant corrosion. The stators were virtually identical before the engine test and seemingly had passed all qualification standards. The original equipment manufacturer (OEM) of the T-55 engine stator was Avco Corporation - Lycoming Division, Stratford, CT. The second source vendor being qualified was Electro-Methods Incorporated (EMI), South Windsor, CT, and EMI's coating subcontractor Microfin Corporation, Providence, RI. ARL- WMRD performed a detailed investigation that stipulated several recommendations. Some of these recommendations were adopted, and further testing was performed. The final testing of the T-55 stators that incorporated the ARL-WMRD recommended changes provided data that indicated the engine test would be successful. Upon subsequent engine testing, acceptable results were achieved with the new corrosion resistant coating system.
Distribution: Approved for public release
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Last Update / Reviewed: November 1, 1999