Federal Register #2026-22785

FAA safety directive requiring corrective action for affected Lycoming engine piston pins

The FAA issued a safety directive for certain Lycoming aircraft engines fitted with affected piston pins. - Government buyer / issuing office: U.S. Department of Transportation (DOT), Federal Aviation Administration (FAA). This is a safety regulation, not a procurement solicitation. - OEM: Lycoming Engines, manufacturer of the affected engines and piston pins. - Affected product: Piston pin P/N LW-13445, in specified Lycoming engine models, where the pin was manufactured during the covered period or its manufacture date is unknown. Quantity is not specified. - Required actions: Replace affected pins with parts eligible for installation under the directive. For applicable engine groups, change the oil and inspect the oil filter, oil pressure screen, and oil suction screen for metal particulates; if particulates are found, replace affected pins before further flight. - Compliance and restriction: Deadlines vary by engine group and condition, ranging from a short flight-time deadline to specified flight-time limits or the next qualifying maintenance event or overhaul. Installing affected pins on any engine is prohibited. - Safety purpose: Address piston-pin failure risks that could cause engine damage or failure, an in-flight shutdown, and loss of aircraft control.

Description

The Federal Aviation Administration is issuing an airworthiness directive for certain Lycoming engines with affected piston pins, superseding AD 2026-17-10 and expanding the list of affected engine models. The directive requires replacement of affected piston pins with eligible parts and, for certain engines, an oil change and visual inspection of the oil filter and screens for metal particulates. It also prohibits installing affected piston pins on any engine. The rule is effective November 24, 2026, and comments are due by December 24, 2026.

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