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206-310-004-103 – Bell Helicopter OEM Main Rotor Pitch Link Restraining Strap
Available now on the Airparts.aero Marketplace.
Overview
The Bell Helicopter 206-310-004-103 is a flight-critical, OEM restraining strap assembly for the main rotor pitch change links on the Bell 206B JetRanger and 206L LongRanger series helicopters. This is not a primary load-bearing component; it is an exquisitely engineered fail-safe device of last resort. Its sole, life-saving purpose is to provide a secondary, redundant retention path for the pitch link in the unfathomable event of a primary fastener or bearing failure. Should the main attachment fail, this strap is designed to prevent the pitch link from detaching from the swashplate or main rotor grip, an event that would cause a complete and catastrophic loss of flight control.
Manufactured from high-strength, fatigue-resistant alloy steel and heat-treated to a specific temper, this strap is designed to withstand the violent, high-cycle vibratory environment of the main rotor hub. Every aspect of its design, from the material and finish to the manufacturing and inspection processes, is dictated by the absolute necessity for it to perform its function flawlessly if ever called upon. As a component designed to prevent the ultimate failure, there is no substitute for the certified quality of this genuine Bell OEM part.
Key Features
Genuine Bell Helicopter OEM Part: The only part certified and approved for this life-saving application, manufactured to Bell's exact material and quality specifications.
Critical Fail-Safe Component: A cornerstone of the Bell 206's rotor system design philosophy, providing a redundant load path in the event of a primary control linkage failure.
High-Fatigue Life Design: Engineered to endure the extreme, high-frequency vibratory environment of the main rotor hub without cracking or failing.
High-Strength Alloy Steel Construction: Fabricated from premium, heat-treated alloy steel (e.g., 4130/4340) for the ultimate in strength and ductility.
100% NDT Inspected: Subjected to rigorous, 100% non-destructive testing (NDT), such as magnetic particle inspection, to ensure each part is free from any microscopic material defects.
Corrosion Protection: Cadmium plated for superior corrosion resistance in demanding operational environments.
Technical Specifications
Part Number: 206-310-004-103
Component Type: Main Rotor Pitch Link Restraining Strap Assembly
OEM Manufacturer: Bell Helicopter (a Textron Company)
Material: High-Strength, Heat-Treated Alloy Steel
Finish: Cadmium Plated per aerospace specifications.
JASC Code: 6410 - ROTOR BLADE CONTROL SYSTEM
Aircraft Compatibility
Bell Helicopter: 206B JetRanger III, 206L LongRanger, 206L-1, 206L-3, 206L-4.
Note: This is a flight-critical rotor system component. The specific helicopter Illustrated Parts Catalog (IPC) for a given serial number is the final and absolute authority for determining part applicability.
Applications
Secondary Control Retention: Its sole application is to act as a secondary, fail-safe retainer for the main rotor pitch change link at its attachment point to the swashplate or main rotor blade grip.
Why Choose 206-310-004-103?
There are certain components on a helicopter where the concept of a non-certified or "alternative" part is unthinkable. This is one of them. The 206-310-004-103 is an engineered safety device designed to save the lives of everyone on board in the event of a primary control system failure. Its performance depends entirely on the certified material, the precise heat treatment, and the flaw-free manufacturing process guaranteed only by the OEM. Using a part from an unknown source, or reusing a part of unknown history, introduces a risk that is beyond measure. For this life-saving application, the genuine Bell OEM part is the only airworthy choice.
The engineering principle governing the design of the 206-310-004-103 strap is that of fail-safe design and damage tolerance. In critical rotorcraft systems where full redundancy (i.e., two completely separate, loaded systems) is not practical, fail-safe components are employed. This design philosophy assumes that the primary component will eventually fail. The fail-safe component (the strap) is therefore engineered to withstand the dynamic loads it would be subjected to after the primary failure has occurred. It is designed to have a specific, finite fatigue life under these emergency loads, which is calculated to be sufficient for a pilot to recognize the failure, declare an emergency, and perform a safe landing. The material selection (high-strength, high-ductility alloy steel), the forming process (creating generous radii to eliminate stress concentrations), and the 100% NDT inspection are all mandated by this life-saving, "second-chance" design requirement.
Note: The 206-310-004-103 is a flight-critical, and may be a life-limited, component. It must be installed by a certified A&P/IA mechanic with specific type experience on Bell 206 rotor systems. Installation must be performed in strict accordance with the Bell Helicopter maintenance manual. Any strap that is bent, nicked, shows signs of corrosion, or has exceeded its service life limit must be scrapped and replaced with a new, certified part.
Documentation
No public-facing OEM documentation was located for this specific part number. All authoritative technical data, installation procedures, inspection criteria, and service life limits are contained within the proprietary Bell Helicopter 206B and 206L Series Maintenance and Overhaul Manuals and their associated Component Repair Manuals.
