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Lycoming Airworthiness Directive: Ensuring Your Aircraft’s Safety with Aviation Laboratories

As leaders in aviation analysis, Aviation Laboratories is committed to keeping our valued customers informed about critical industry updates. The recent Federal Aviation Administration (FAA) Airworthiness Directive (AD) concerning Lycoming engines is a significant development that requires immediate attention from aircraft owners and operators.

Understanding the Directive

Effective December 5th, 2024, the new AD mandates the following for many Lycoming engine models:

  • Visual inspection of the oil filter or screen during every oil change
  • If bronze particles are detected and traced to the Connecting Rod Bushing, a visual inspection of this part is required
  • Replacement of the Connecting Rod Bushing if confirmed as the source
  • No further visual inspections for bronze particles are required post-replacement under this AD

It’s crucial to note that part replacement should never be postponed beyond the standard overhaul period.

Who Needs to Take Action?

This directive affects owners and operators of aircraft equipped with numerous Lycoming engine models. If you’re operating an aircraft with a Lycoming engine, it’s essential to familiarize yourself with these new requirements and take appropriate action.

Why Filter Analysis, Not Oil Analysis?

We’ve received inquiries about using oil analysis to satisfy the AD requirements. However, it’s crucial to understand that the AD specifically calls for filter analysis. Here’s why:

  • Oil analysis primarily detects elements smaller than 10 microns, while bronze particles are typically larger
  • Bronze is an alloy (a combination of copper and tin), not a single element
  • Oil analysis might show increases in copper and tin, but these could come from sources other than bronze (like brass or various additives)
  • Filter analysis can definitively identify bronze particles, providing the specific information required by the AD

Lycoming understands these limitations, which is why they’ve specified filter analysis in the AD.

Aviation Laboratories: Your Trusted Partner in Compliance

As experts in aviation-only analysis, we offer unparalleled services to help you meet the new AD requirements:

  • State-of-the-art equipment for precise metal particle detection
  • Rapid turnaround times to minimize downtime
  • Expert interpretation of results by experienced technicians
  • Comprehensive support to ensure AD compliance

Take Action Now

Don’t wait until the December 5th deadline. Protect your aircraft and ensure compliance:

At Aviation Laboratories, we’re not just a service provider – we’re your dedicated partner in maintaining aircraft safety and compliance. Let us help you navigate this new directive with confidence and peace of mind.

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4 Responses

  1. I have a Challenger oil filter on my plane that is reusable. At oil change, it is flushed cleaned with mineral spirits and particles filtered out. Could this be used to satisfy the filter analysis?

  2. I have a Lycoming 0320 that is subject to the new AD for connecting rod issues. I do not have a filter so will need to pull oil screen at every oil change to look for bronze particles. I was wondering if there is value in having an oil analysis kit available for every oil change as well that could help validate any issues with connecting rods? I learned from your website that a filter is best way to capture large particles, and oil analysis only will not be able to verify sources of bronze.

    1. Oil analysis can only “see” elements. Bronze is an alloy comprised primary of the elements copper and tin, but copper and tin can sometimes be found in other things, so their detection is not necessarily indicative of bronze. Bronze however, can be definitively detested from “chips”.