EASA AD US-2022-16-03: Ignition - Magneto Roller Bearings - Inspection / Replacement

What to do

Affected operators must replace or inspect the magnetos within 25 operating hours time-in-service or before further flight if the magneto has already exceeded 25 hours. If inspection reveals no white grease lubricant, magneto components must be replaced and the magneto reassembled according to Continental Aerospace Technologies Critical Service Bulletin CSB673, Revision C. Comments on the AD are accepted until September 12, 2022.

Summary

Federal Aviation Administration Airworthiness Directive 2022-16-03 is a final rule addressing certain Continental Aerospace Technologies, Inc., Lycoming Engines, and Textron Lycoming/Subsidiary of Textron, Inc. reciprocating engines. It targets magnetos with improperly lubricated roller bearings that may overheat and seize, affecting engine performance and safety. The directive applies to multiple engine series including Continental GTSIO-520, IO-346, IO-470, IO-520, IO-550, LTSIO-520, O-470, TSIO-520, TSIOL-550, Lycoming AEIO, AIO, GO, GSO, HIO, IGO, IGSO, IO, LIO, LTIO, O, TIGO, TIO, TVO, VO series, and Textron Lycoming IO-720 engines.

What changed

This new airworthiness directive requires operators to replace affected magnetos or inspect them for the presence of the specified white grease lubricant. If the lubricant is absent, magneto components must be replaced and the magneto reassembled. The directive clarifies that returning parts to the manufacturer or discarding roller bearings is not mandatory under this AD.

Why it matters

This AD addresses a critical safety issue caused by a manufacturing quality escape involving improperly lubricated roller bearings in magnetos, which can lead to overheating, accelerated wear, magneto seizure, and potential engine failure. Compliance is essential to prevent in-flight engine shutdowns and ensure continued airworthiness of affected aircraft. Operators, maintenance providers, and compliance teams must prioritize this directive to mitigate risks associated with ignition system failures.