The 63900-174 is a Piper OEM airframe bushing used as a structural wear component in light aircraft mechanical assemblies. It functions as a precision sleeve interface between moving parts and fixed structural lugs, typically in control systems, linkage pivots, or airframe attachment points where controlled rotation and reduced wear are required.

In Piper aircraft applications, this type of bushing is installed in joints where a bolt or pin rotates within a structural bracket. Its purpose is to prevent direct metal-to-metal contact, maintaining alignment, reducing friction, and preserving the integrity of the surrounding airframe structure. This helps ensure consistent control feel and long-term dimensional stability in high-cycle, vibration-prone environments.

The 63900-174 is a certified aviation part and is referenced in multiple Piper parts catalogs and service documentation as a required component in specific airframe assemblies. It is commonly supplied as a precision-machined metallic bushing (often bronze or steel alloy depending on installation location), selected for wear resistance and compatibility with lubricated pivot systems.

Because it is a structural wear component, inspection focuses on elongation, scoring, corrosion, and fit tolerance. Excessive wear can introduce play in control systems or structural joints, making timely replacement essential for maintaining airworthiness.

Key features include:

Piper 63900-174 airframe sleeve bushing
Used in structural pivot and control linkage assemblies
Reduces friction and prevents metal-to-metal wear
Maintains alignment in rotating airframe joints
Installed in lugs, brackets, and control system pivots (model-dependent)
Material: typically bronze or aircraft-grade steel alloy
Designed for high-cycle, vibration-prone aviation environments
Precision-fit component critical for control system integrity
Subject to wear inspection and replacement per maintenance limits
Referenced in Piper IPC and service bulletins as a required part