Product Improvement Test of T53-L-11 Engine in the UH-1D Helicopter
ARMY AVIATION BOARD FORT RUCKER AL
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As a result of the unsatisfactory performance of certain T53-L-11 engine components, the USAAVNTBD was requested to conduct a product improvement test of improved components on a T53-L-11 engine installed in a UH-1D Helicopter during the period June 1964 to December 1965. The test was terminated at the end of 941 hours of operation owing to damage resulting from failure of a bearing not being tested. It was concluded that the product-improvement items found suitable as replacements for the standard items in the T53-L-11 engine are the combustor deflector, gas-produced turbine wheel, exhaust diffuser, power turbine nozzle, and asbestos air seal that other samples of the combustor liner mounting system should be tested to analyze further the cause of the one bracket failure that the suitability of the product-improvement main-shaft carbon seal, No. 2 and No. 3 main-shaft bearings, and power turbine wheel cannot be determined because of damage sustained when the No. 4 bearing failed and that the suitability of the design to air-seal segments to keep walnut-shell compound from lodging between segments cannot be determined because the engine was not cleaned with the walnut-shell compound. It is recommended that the product- improvement combustor deflector, gas-producer turbine wheel stainless-steel exhaust diffuser, power turbine nozzle, and asbestos air seal be adopted as standard and incorporated in the T53-L-11 engines during production or overhaul that additional samples of the product-improvement main-shaft carbon seal, combustor liner mounting system, No. 2 and No. 3 main-shaft bearings, and power turbine wheel be subjected to a 1200-hour test.
- Jet and Gas Turbine Engines