[Docket No. FAA-2005-21331; Directorate Identifier
2005-NE-07-AD; Amendment 39-14605; AD 2006-10-21]
ANN is looking over yet
another Lycoming AD that was just published to the Federal
Register, affecting a number of Lycoming 360 and 540 series
engines, using ECi connecting rods.
According to the FAA, it is "adopting a new
airworthiness directive (AD) for certain Lycoming Engines (formerly
Textron Lycoming) 360 and 540 series reciprocating engines with ECi
connecting rods, part number (P/N) AEL11750, installed. The
Airmotive Engineering Corp, Division of Engine Components
Incorporated (ECi), holds the Parts Manufacturer Approval (PMA) for
the affected parts, and markets the parts as ECi parts."
"This AD requires replacing certain lot and serial numbered
connecting rods, P/N AEL11750, having forging part number AEL11488.
This AD would also prohibit installing certain ECi connecting rods,
P/N AEL11750, into any Lycoming 360 or 540 series reciprocating
engines. This AD results from reports of connecting rods with
excessive variation in circularity of the journal bores. We are
issuing this AD to prevent fatigue failure of the connecting rod
and a possible uncommanded shutdown of the engine."
The AD becomes effective June 22, 2006.
In its final ruling, the FAA also addresses the comments made by
many pilots that such an airworthiness directive is not needed,
based on the relatively few incidents reported.
"Several commenters question the need for the connecting rod
AD," the FAA stated. "We disagree. We confirmed that a
manufacturing defect existed in the ECi connecting rods. The FAA
has determined that this defect was the most probable cause of an
engine shutdown and forced landing incident."
"ECi identified the manufacturing process deficiencies that were
responsible for the defective condition and took specific actions
to correct these deficiencies. We also determined that the subject
ECi connecting rods in service could possess these manufacturing
defects and could, therefore, fail during operation."