Airworthiness Directive · Amendment 39-12950 · Textron Lycoming, AVCO Corporation, Lycoming Engines Engines
Textron Lycoming, AVCO Corporation, Lycoming Engines Engines
Superseded. A later AD replaced this one: AD 2004-05-24. Comply with the one in force.
This AD applies to Textron Lycoming, AVCO Corporation, Lycoming Engines AEIO-540, AEIO-540-D4A5, AEIO-540-D4B5, AEIO-540-D4C5, AEIO-540-D4D5, AEIO-540-L1B5, AEIO-540-L1B5D, AEIO-540-L1D5, IO-540 Series (all), LTIO-540-F2BD, LTIO-540-J2B, LTIO-540-J2BD, LTIO-540-K1AD, LTIO-540-N2BD, LTIO-540-R2AD, LTIO-540-U2A, LTIO-540-V2AD, LTIO-540-W2A, O-540 Series (all), TIO-540-A1A, TIO-540-A1B, TIO-540-A1C, TIO-540-A2A, TIO-540-A2B, TIO-540-A2C, TIO-540-AA1AD, TIO-540-AB1AD, TIO-540-AB1BD, TIO-540-AE2A, TIO-540-AF1A, TIO-540-AF1B, TIO-540-AG1A, TIO-540-AH1A, TIO-540-AK1A, TIO-540-C1A, TIO-540-E1A, TIO-540-F2BD, TIO-540-G1A, TIO-540-H1A, TIO-540-J2B, TIO-540-J2BD, TIO-540-K1AD, TIO-540-N2BD, TIO-540-R2AD, TIO-540-S1AD, TIO-540-T2AD, TIO-540-U2A, TIO-540-V2AD, TIO-540-W2A.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment supersedes an emergency airworthiness directive (AD) that was sent previously to all known U.S. owners and operators of Textron Lycoming (T/L) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 series reciprocating engines. That action requires replacing certain zinc-plated crankshaft gear retaining bolts. This action still requires replacing certain zinc-plated crankshaft gear retaining bolts, but expands the population of affected engines. This amendment is prompted by two recent failures of zinc-plated crankshaft gear retaining bolts, and a reassessment of the extent to which the suspect bolts may still be present in the field. The actions specified by this AD are intended to prevent loss of all engine power and possible forced landing.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
