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CF6 JET ENGINE DIAGNOSTICS
CF6 HIGH PRESSURE COMPRESSOR AND TURBINE CLEARANCE EVALUATIONS
JT8D ENGINE PERFORMANCE RETENTION
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abrasive aerospace airfoil airline airplane alloys APMS average blade tip borescope clearance changes coatings cobalt cold section combustor components cooling air flow COSAM cruise data frame deterioration rates Diagnostics Program efficiency Engine Diagnostics engine health monitoring ENGINE MONITORING SYSTEM engine operating engine performance erosion evaluation exhaust gas Figure 11 flight cycles flight loads fuel flow gas temperature GAS TURBINE hardware Hastelloy heat transfer high pressure turbine hot section improved increased inlet installed JT8D JT9D liner louver maintenance materials measured models NASA ODS alloys out-of-roundness overhaul parameters percent performance analysis performance deterioration performance loss performance retention Pratt & Whitney predicted recorded reduced refurbishment repair rotor seal segments sensor shown in Figure shroud simulated specific fuel consumption stator structural superalloys take-off tantalum test cell thermal thrust specific fuel tip clearance trend turbine engine typical vanes