EASA SIB NE-20-05
Continental Aerospace Technologies 470, 520 and 550 Engines - Camshaft Gear Tooth Fracture
The Special Airworthiness Information Bulletin SAIB: NE-20-05 is an FAA informational bulletin addressing potential fatigue failure of camshaft gear teeth in Continental Aerospace Technologies 470, 520, and 550 series reciprocating AvGas engines. It highlights the risk of in-flight engine power loss due to fractured camshaft gear teeth and introduces improved camshaft gear part number 656818 as a replacement for older, superseded part numbers. The bulletin applies to engine models O-470-U, IO-470, IO-520, L/TSIO-520, LIO-520, IO-550, IOF-550, TSIO-550, and TSIOL-550.