NAS75-3-005 – Textron Aviation OEM Bronze Sleeve Bushing
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Overview
The NAS75-3-005 is a high-quality, plain sleeve bushing, manufactured to the National Aerospace Standard and supplied with the full certification and traceability of Textron Aviation as an OEM component. This is not a simple spacer; it is a precision-machined bearing designed to be press-fit into a flight-critical component, such as a flight control bellcrank or landing gear linkage, to provide a durable, replaceable, low-friction surface for a pivot pin or bolt.
This component is manufactured from a high-quality bearing bronze alloy, specifically chosen for its excellent strength and tribological (anti-friction and anti-wear) properties. As a sacrificial part, it is designed to wear over time, protecting the more expensive and complex structural component into which it is installed from elongation and wear. Using the genuine OEM part ensures the correct material and precise dimensions required for a proper interference fit and airworthy repair.
Key Features
Genuine Textron Aviation OEM Part: Guarantees the part is the factory-specified and fully certified component, ensuring correct performance and airworthiness.
NAS75 Standard Compliance: Manufactured in strict accordance with the National Aerospace Standard for plain, press-fit bushings.
High-Quality Bearing Bronze Alloy: Machined from a specific bronze alloy (such as SAE 660 / C93200) that provides high compressive strength, corrosion resistance, and a low coefficient of friction.
Press-Fit Installation: The outside diameter is precision-ground to a tolerance that creates a secure interference fit when pressed into a correctly sized hole, locking it in place.
Sacrificial Wear Component: Intentionally designed to be the primary wear item in a pivoting joint, protecting more costly flight control and landing gear components from wear.
Reduces Friction in Pivoting Joints: Provides a smooth, replaceable bearing surface that is essential for the fluid and responsive feel of flight controls.
Technical Specifications
Part Number: NAS75-3-005
Component Type: Plain Sleeve Bushing (Press-Fit)
OEM Authority: Textron Aviation
Governing Specification: NAS75
Material: Bearing Bronze (e.g., SAE 660 / C93200)
Finish: Per NAS75 standard.
Nominal Inside Diameter (for pin/bolt): 3/16 inch (0.1875 inches).
Outside Diameter: 5/16 inch (0.3125 inches).
Length: 5/16 inch (0.3125 inches).
Aircraft Compatibility
As a Textron Aviation OEM part and a NAS standard, this bushing is used in numerous pivoting joints on their aircraft fleet and across the general aviation industry.
Primary Textron Aviation Platforms:
Cessna Piston Aircraft (100, 200 Series)
Beechcraft Piston Aircraft (Bonanza, Baron)
Other models as specified in the IPC.
General Aerospace Usage: Common in the flight control systems and landing gear of many general aviation aircraft.
Note: Verification of applicability is the responsibility of the installer. Always consult the current version of the aircraft's Illustrated Parts Catalog (IPC) to confirm part number eligibility for a specific location.
Applications
Sole Application: To provide a replaceable, low-friction bearing surface in flight control system components and landing gear linkages, such as:
Aileron, elevator, and rudder bellcranks.
Push-pull rod ends.
Control surface hinges and linkages where a 3/16" bolt or pin is used.
Landing gear torque links and down lock mechanisms.
Why Choose this NAS75-3-005?
The feel and responsiveness of an aircraft's flight controls are directly related to the precision of its linkages. Worn bushings create "slop" or free play, which can lead to control surface flutter and unsafe handling characteristics. The genuine OEM NAS75-3-005 bushing is the only part guaranteed to have the precise outside diameter for a proper press-fit and the correct bronze alloy. Using a non-certified bushing can result in a loose fit, leading to rapid wear of the parent component, or an overly tight fit, which can damage the component during installation.
The NAS75-3-005 bushing is a prime example of a component whose material science is perfectly matched to its function. It is manufactured from a leaded-tin bronze, typically C93200 (SAE 660). In this alloy, the tin provides hardness and strength, while the lead, which is largely insoluble in the copper-tin matrix, is dispersed throughout the material as soft, microscopic particles. In a bearing application, especially the low-speed, high-load, oscillating motion of a flight control, these lead particles smear across the mating surfaces. This process creates a thin, self-replenishing film of solid-film lubricant. This gives the material an exceptionally low coefficient of friction and excellent anti-galling and anti-seizure properties, particularly in boundary lubrication conditions where a full hydrodynamic grease film may not be present. This "self-lubricating" characteristic is what makes this specific bronze alloy the ideal choice for creating a durable, low-friction plain bearing.
Note: This is a flight-critical component. It is a wear item subject to periodic inspection for looseness and excessive wear. Removal of the old bushing and installation of the new one are press-fit operations that require specialized tooling (arbors and a press) and must be performed by a certified A&P mechanic in accordance with the aircraft maintenance manual. The inside diameter must be reamed to its final specified dimension after installation to ensure a proper close-tolerance fit for the pivot bolt.
Documentation
The National Aerospace Standard governing this part is publicly available. OEM-specific application and installation data is contained within the Textron Aviation maintenance and parts manuals.
Defense Logistics Agency - NAS75 Document: https://everyspec.com/NAS/NAS-0-99/NAS75_55755/