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The degree of preservation is determined by the anticipated length of time an engine is expected to be inactive. The three categories of storage are:

a. Flyable storage. An engine that will not be operated for a period of at least 72 hours, nor more than 14 days, must be preserved and maintained with all components and systems in an operable condition. On the third day, the engine must be run-up or motored with the starter. If the engine is only motored on the third day, it must be run up on the seventh.


b. Temporary storage. An engine that will not be operated for over 14 days, but less than 45 days, must be placed in temporary storage. Engines normally falling in this category are those undergoing minor repair or modification, awaiting assignment or disposition, being held in operational reserve, or any other condition which requires idleness for a period not to exceed 45 days.

c. Extended storage. An engine that will be inactive for more than 45 days, but not exceeding 180 days, must be preserved and maintained in extended storage. Usually, this includes those engines undergoing major repair or modification, those declared surplus and awaiting final disposition, or any other circumstance that would warrant idleness for 45 to 180 days.


Permanent storage is a depot level function.

ENGINE PRESERVATION - GENERAL. All preservation procedures require that any accumulation of dirt be removed from the engine with dry cleaning solvent. Under usual conditions, it will not be necessary to clean the entire external surface of the engine. If necessary, perspiration residues can be removed from close tolerance bare metal surfaces by wiping with a clean cloth dampened in fingerprint remover before cleaning with solvent.


To prevent oil contamination, never mix synthetic-base oils with mineral-base oils. Synthetic-base lubricating oil is required for the engine. Only a synthetic-base corrosion preventive oil can be used to spray the compressor for corrosion prevention.



David L. Heiserman, Editor

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Revised: June 06, 2015