Engine - Piston Pin - Replacement / Inspection
- Published
- Takes effect
- Deadline
- Replaces
- 2026-17-10
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators must replace the identified piston pins with eligible parts and, for certain engines, perform an oil change and inspect the engine oil filter, oil pressure screen, and oil suction screen for metal particles within 5 hours time-in-service after the AD's effective date. Installation of affected piston pins is prohibited. Compliance must be completed by November 24, 2026, the effective date of this AD, with inspections and replacements required within 25 hours time-in-service or earlier depending on engine model.
Summary
The Engine - Piston Pin - Replacement / Inspection is a Federal Aviation Administration (FAA) Airworthiness Directive (AD 2026-22-13) addressing Lycoming Engines Model O-235, O-540, and IO-540 piston pins. It mandates replacement of affected piston pins and, for certain engines, requires oil changes and inspections for metal particulates to prevent engine failure. This directive expands the applicability to additional Lycoming engine models and clarifies the definition of affected piston pins.
What changed
This AD supersedes AD 2026-17-10 by expanding the list of affected Lycoming engine models and clarifying the definition of an affected piston pin. It introduces mandatory oil changes and visual inspections of engine oil components within 5 hours time-in-service for certain engines, a requirement not included in the previous service bulletin. The AD also prohibits installation of affected piston pins on any engine and updates corrective actions for newly identified engines.
Why it matters
This AD is critical for aviation professionals because piston pin failures can cause metal contamination in engine oil, leading to engine damage, in-flight shutdowns, and potential loss of aircraft control. Operators and maintenance organizations must comply promptly to ensure engine safety and airworthiness. The expanded applicability means more engines are subject to inspection and replacement, increasing the scope of compliance and maintenance planning.
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