EASA SIB NE-06-32R1: Lycoming direct-drive reciprocating engines - Propeller Strike Events - Recommended Actions

What to do

Operators and maintenance personnel should comply with FAA AD 2004-10-14 by replacing the crankshaft gear bolt according to Lycoming MSB 475C after any propeller strike. They should also follow Lycoming MSB 533A to disassemble and inspect the engine's rotating and reciprocating parts for damage. If necessary, contact the local FAA Flight Standards District Office to request a Special Flight Permit to move the aircraft safely to a repair location.

Summary

The FAA Special Airworthiness Information Bulletin SAIB: NE-06-32R1 provides guidance on Lycoming direct-drive reciprocating engines, specifically addressing propeller strike events. It applies to all Lycoming direct-drive engines including VO-360 and IVO-360 series, except certain O-320, O-360, LO-360, TO-360, LTO-360, and TIO-541 series engines. The bulletin highlights compliance requirements with Airworthiness Directive 2004-10-14 and recommends additional engine disassembly and inspection after a propeller strike.

What changed

This bulletin clarifies that AD 2004-10-14 supersedes previous AD 91-14-22 by revising the propeller strike definition and removing overhaul and gear train repair triggers for compliance. It confirms that Special Flight Permits may be issued by local FAA offices despite the AD's 'before further flight' compliance requirement, aligning with FAR Part 39.23. Additionally, it emphasizes Lycoming's supplemental recommendation for complete engine disassembly and inspection per MSB 533A, which is not mandated by the AD.

Why it matters

This information is critical for operators, maintenance organizations, and repair facilities to ensure proper compliance with FAA regulations after a propeller strike involving affected Lycoming engines. Understanding the AD requirements and the possibility of obtaining Special Flight Permits facilitates safe and legal aircraft movement to repair facilities. The additional Lycoming inspection recommendation helps prevent undetected engine damage that could compromise safety and reliability.