The AD includes additional engine models have been added to the applicability.
The AD notes that in the special flight permit paragraph, specifying “no metal contamination in the oil filter”, did not account for trace metal particles that can be found in newer engines after the break-in process.
A Special Flight Permit is still required to position the aircraft for maintenance.
The FAA AD inspection requirements apply to all engines referenced in MSB23-01A regardless of the operating hours on the engine.
The FAA AD must be completed prior to the next flight and does not provide a flight time allowance that can be used to reposition the aircraft to a maintenance facility. A Special Flight Permit will need to be requested and issued provided that:
- The engine oil filter pleats or screen are first inspected and there is no evidence of metal contamination; or
- An oil change has been completed within the previous 5 flight hours, and there was no evidence of metal contamination in the oil filter pleats or screen.
Refer to the AD for the complete requirements.