An airworthiness directive (AD) impacting thousands of high-wing Piper aircraft has sparked innovation among vintage Piper enthusiasts, especially those with airframe and powerplant certifications, who are working on solutions to reinforce rather than replace parts.

The final rule, released on February 13 and effective March 20, mandates replacing rudders with 1025 carbon steel rudder posts on affected aircraft with posts made of 4130 low-alloy steel. The rule also allows alternative methods of compliance (AMOCs), which, with FAA approval, could help address the anticipated shortage of replacement rudders.

Vintage Piper communities, including short-wing, J-series, and Super Cub groups, are exploring cost-effective ways to repair, reinforce, and replace the 1025 rudder posts in hopes of gaining FAA approval. One proposal involves reaming the post to eliminate weld penetrations, then inserting a 4130 tube inside the existing post, all while keeping the rudder covering intact.

Rudder suppliers, like Jim Dyer of Univair Aircraft Corp., are supportive of AMOC approvals as they would ease the strain on their operations. Dyer explained that his inventory of rudders is already sold, and his welders can only work so fast. AMOC approval would alleviate some pressure on his business, which is already running at full capacity.

The AD gives aircraft owners two to ten years to comply, depending on their aircraft’s design, so mass groundings are unlikely. However, the next few years may be busy as owners seek parts and mechanics work to accommodate increasing demand. Despite the challenges, many vintage Piper enthusiasts are dedicated to keeping their aircraft flying for future generations.

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