Question for Paul McBride, the General Aviation News engines expert: Do you see elevated risk in flying a plane right after an engine overhaul? If so, what minimum amount of Since Major Overhaul (SMOH) hours would you like to see for optimum safety?
Ryan Purtell
Paul’s Answer: Ryan, you’ve asked an interesting question, one that I think has probably crossed the minds of many pilots.
Let me assure you that flying a plane following an engine overhaul is safe — providing that the overhaul was done in compliance with all the engine manufacturer’s recommendations and specifications, in addition to any FAA AD Notes that may apply to that specific engine.
This statement also applies to any factory engine.
The overhaul facility should make all available records of work completed, and parts used, which should be well documented and become a permanent part of the engine records.
The most important thing that needs to be complied with, for Lycoming engines, is the information set forth in Lycoming Service Instruction 1427C regarding Lycoming Reciprocating Engine Break-in and Oil Consumption. Compliance with this important publication should assure that the engine meets all of the requirements for return to service.
All of the aforementioned should provide you with confidence that the engine is safe to fly.
