S2385-5 – Textron Aviation OEM Landing Gear Torque Link Washer
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Overview
The S2385-5 is a flight-critical, genuine Textron Aviation (Cessna) Original Equipment Manufacturer (OEM) washer, specifically engineered for use in the nose landing gear torque link (or "scissors") assembly. This is not a standard hardware store washer; it is a precision component whose exact dimensions and material properties are critical to the proper function and safety of the landing gear system. Its primary role is to provide a smooth, hardened bearing surface and distribute the loads between the torque link pivot pins or bolts and the softer aluminum or steel torque link arms.
Manufactured from high-strength steel and typically cadmium plated for corrosion resistance, this washer is designed to withstand the high shear loads and impacts experienced during ground operations. Its precise thickness and flatness are essential for maintaining the correct clearances and geometry within the torque link assembly, preventing binding and excessive play. As the genuine OEM part, it is the only component guaranteed to meet the specific requirements of this critical application.
Key Features
Genuine Textron Aviation OEM Part: Guarantees the part is fabricated to the exact Textron engineering drawing for material, hardness, thickness, and flatness, ensuring correct fit and function.
Load Distribution: Provides a hardened surface to distribute the compressive and shear loads from the pivot pin/bolt head and nut, preventing wear and elongation of the softer torque link arm material.
Precision Thickness: Manufactured to tight tolerances to ensure the correct axial spacing and alignment within the torque link assembly, preventing both binding and excessive free play.
High-Strength Steel Construction: Made from a specific grade of steel, heat-treated for high strength and wear resistance required in a landing gear application.
Corrosion Resistant Finish: Typically cadmium plated to provide robust protection against corrosion in the harsh landing gear environment.
Flight-Critical Component: Essential for maintaining the integrity and alignment of the nose gear torque link, which is critical for preventing shimmy and ensuring directional control.
Technical Specifications
Part Number: S2385-5
Component Type: Washer / Bearing Washer
OEM Authority: Textron Aviation (Cessna)
Application: Nose Landing Gear Torque Link Pivot Joint
Material: Steel (Specific alloy and heat treatment per OEM drawing).
Finish: Cadmium Plated or other protective coating per OEM specification.
Dimensions (ID, OD, Thickness): Per Textron Aviation Engineering Drawing S2385.
Governing Specification: Textron Aviation Engineering Drawing S2385.
Aircraft Compatibility
This OEM washer is the specified component for the nose gear torque link assembly on a vast range of Cessna's most popular aircraft.
Primary Textron Aviation Platforms:
Cessna 150, 152
Cessna 172 Skyhawk
Cessna 177 Cardinal
Cessna 180, 182, 185
Cessna 206, 207
Cessna 210 Centurion
Note: Verification of applicability is the absolute responsibility of the installer. The aircraft's current Illustrated Parts Catalog (IPC) for its specific serial number is the final and absolute authority for confirming part number eligibility.
Applications
Sole Application: To be installed under the head of the pivot pin/bolt and/or under the nut in the nose landing gear torque link (scissors) assembly, providing a bearing surface and distributing loads.
Why Choose S2385-5?
The safe operation of an aircraft's landing gear relies on the precise fit and function of every component. The S2385-5 washer plays a critical role in preventing wear and maintaining the tight tolerances required to prevent nose wheel shimmy. A generic washer may lack the required hardness (leading to rapid wear and joint looseness), the correct thickness (causing binding or excessive play), or the proper corrosion protection. Only the genuine Textron OEM part is guaranteed to meet all the engineering specifications required for this demanding, flight-critical application.
The engineering function of the S2385-5 washer within the nose gear torque link pivot extends beyond simple load distribution; it serves as a critical tribological interface. The torque link experiences oscillating motion under high bearing stress, particularly during shimmy events or impacts. This washer provides a hardened, smooth surface (typically steel) against which the softer torque link arm (often aluminum) or the pivot bolt head/nut can rotate with reduced friction and wear. Without this hardened washer, the relative motion would quickly cause galling and fretting wear on the primary structural components, leading to joint looseness (play). The precise thickness of the S2385-5 is also engineered to maintain the correct axial clearance in the joint stack-up, preventing binding while minimizing the free play that can initiate shimmy oscillations.
Note: This is a flight-critical landing gear component. It is a wear item and must be inspected for wear, scoring, corrosion, or deformation in accordanceance with the aircraft maintenance manual, particularly when replacing torque link bolts or bushings. Installation must be performed by a certified A&P mechanic. The correct placement and orientation of this washer within the torque link assembly stack-up is essential for proper function.
Documentation
All technical data, including material, dimensions, hardness, and installation procedures for the S2385-5 washer, are proprietary to Textron Aviation. This information is contained within the official Maintenance Manual and Illustrated Parts Catalog for the applicable aircraft model. No public-facing documentation is available.