From an operational availability stand point, the U.S. Navy is interested in the short term reliability of its ship based LM2500 gas turbine engines. That is the likelihood that an engine will operate successfully through a six-month deployment (usually 1500 to 2000 operational hours). From a maintenance and cost of ownership standpoint both the short-term and long-term reliability are of concern. Long-term reliability is a measure in time (in operating hours) between engine removals. To address these requirements U.S. Navy Fleet support maintenance activities employ a system of tests and evaluations to determine the likelihood that an LM2500 will meet its short and long-term goals. The lowest level inspection is the predeployment inspection, which attempts to identify primarily mechanical faults with the engine. Gas Turbine Bulletin inspections are used to determine if predefined wear out modes exists. Performance evaluations can be performed which determine the ability of the LM2500 and its control system to meet expected power requirements. Lube oil system data can be analyzed to determine if excessive leakage or excessive scavenge temperatures exist. Engine vibration characteristics can be reviewed to identify the source of both synchronous and nonsynchronous vibration and determine if corrective measures need to be taken. This paper will discuss how the lowest level inspections feed the more sophisticated analysis and how these inspections and evaluations work to provide a systematic method of insuring both short and long-term LM2500 reliability.

Hartranft, J., 1993, “Expansion of USN Gas Turbine Repair Into the Intermediate Level Repair Facility,” ASME Paper 93-GT-152.
Thompson, B. D., Badgley, R., and Hartranft, J., 1989, “Experience From Expansion of On-Board Maintenance for Marine Gas Turbines,” ASME Paper 89-GT-232.
Thompson, B. D., and Badgley, R., 1988, “Application of an Advanced Hybrid Rotordynamics Model to the Complete Structure of a Marine Gas Turbine Engine,” ASME Paper 88-GT-123.
Thompson, B. D., 1991, “Optimization of Gas Generator and Power Turbine Trim Balance Techniques,” ASME Paper 91-GT-240.
Thompson, B. D., and Raczkowski, R., 1996, “Development of a Diagnostic Tool to Trouble Shoot LM2500 Performance and Controls Problems,” ASME Paper 96-GT-213.
Schreder, D., Howell, I., Hardin, J., Mirilovich, R., and Hartranft, J., 1994, “A Gas Turbine Condition Monitoring System,” Proceedings of ASNE, Sept. 7–9.
Kandl, M. G., and Groghan, D. A., 1980, “U.S. Navy, LM2500 Gas Turbine Condition Monitoring Development Experience,” ASME Paper 80-GT-158.
You do not currently have access to this content.