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It is important to see that the engine compartment is kept as clean as possible because the high-velocity airflow through the engine will draw any foreign objects into the compressor. All loose parts, such as safety wire, cotter pin clippings, and nuts and bolts should be removed immediately. Tubing and lines should be checked for security, nicks, chafing, dents, and leaks.

Inspection and maintenance of gas-turbine engines are somewhat easier than those of reciprocating engines because the gas turbines stay cleaner. Besides, the first several stages of most compressors can be inspected for FOD by using a strong light. Also, the last two turbine stages are readily opened for inspection of heat damage.

The oil system is checked on the daily inspection for proper oil level. However, when adding oil, different types should not be mixed. In the past the Army has used MIL-L-7808 lubricating oil in turbine engines. Because of the higher operating temperatures encountered in the current gas turbine engines, a new oil has been developed. Military Specification No. MIL-L-23699 uses a new synthetic base and new additive combination to cope with the more severe operating conditions and higher temperature ratings. When changing from MIL-L-7808 to MIL-L-23699 lubricating oil, check the engine TM for proper procedures.



David L. Heiserman, Editor

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Revised: June 06, 2015