Lycoming YIO-390 — Airworthiness Directives & known issues
The Lycoming YIO-390 is installed on 383 registered aircraft. These are the Airworthiness Directives that apply to the engine family — whichever airframe it’s bolted to.
Engine ADs for the Lycoming YIO-390
- one-timeAD 04-14477 — Airworthiness Directives; Lycoming Engines (Formerly Textron Lycoming), Direct-Drive Reciprocating Engines; Correction
This document makes corrections to Airworthiness Directive (AD) 2004-10-14, applicable to Lycoming Engines (formerly Textron Lycoming), direct-drive reciprocating engines that was published in the Federal Register on May 21, 2004 (69 FR 29210). Some corrections to engine models h…
Exact applicability (by engine serial and installed parts) and compliance come from the aircraft’s engine logs.
Tailplate reads a tail number’s logbooks — engine ADs matched to compliance, time since overhaul vs TBO, and the whole records picture.
Look up a tail number →Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination.