S1104-3 – Textron Aviation OEM Flight Control Rod End Bearing
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Overview
The S1104-3 is a flight-critical, genuine Textron Aviation Original Equipment Manufacturer (OEM) female-threaded rod end bearing, commonly known as a heim joint. This is a primary flight control component, engineered to serve as a high-strength, self-aligning pivot point in the control linkages of numerous Cessna aircraft. Its primary function is to connect the push-pull rods to bellcranks, torque tubes, and control surface horns in the aileron and flap systems, translating pilot or autopilot inputs into precise mechanical movement.
The S1104-3 is not a simple fastener; it is a precision-engineered articulating joint. It consists of a high-strength, cadmium-plated steel body with a swaged-in precision spherical bearing. This bearing allows for the minor angular misalignment that occurs from wing flexure and the arc of travel of control components, preventing binding and ensuring smooth, responsive control feel. As the genuine OEM part, it is the only component guaranteed to meet the material strength, load ratings, and wear characteristics required for this no-compromise application.
Key Features
Genuine Textron Aviation OEM Part: Guarantees the part is the factory-specified and fully certified component, ensuring a perfect fit and uncompromising flight safety.
Self-Aligning Spherical Bearing: The integral spherical bearing accommodates angular misalignment in multiple planes, preventing binding and ensuring smooth operation of the control system.
High-Strength Steel Body: The body is forged or machined from a high-strength steel alloy and cadmium-plated for exceptional strength in both tension and compression, as well as superior corrosion resistance.
Precision Bearing Construction: Features a precision-ground steel ball swaged into a race (typically bronze or a proprietary self-lubricating liner) for low-friction, high-reliability performance.
Primary Flight Control Application: A direct, load-bearing link in the aileron and flap control systems, essential for the command of the aircraft's flight path.
Designed for Push-Pull Loads: Engineered to transmit forces in both tension and compression without buckling or failure.
Technical Specifications
Part Number: S1104-3
Component Type: Rod End Bearing (Heim Joint), Female
OEM Authority: Textron Aviation (Cessna)
Material (Body): High-Strength Steel, Cadmium Plated.
Bearing: Precision spherical bearing, steel ball in a bronze or self-lubricating race (per OEM specification).
Thread Specification: #10-32 UNF (Female).
Governing Specification: Textron Aviation Engineering Drawing S1104.
Aircraft Compatibility
This OEM rod end bearing is a standard flight control component on a vast fleet of Cessna's most popular aircraft.
Primary Textron Aviation Platforms:
Cessna 172 Skyhawk
Cessna 182 Skylane
Cessna 206 Stationair
Cessna 210 Centurion
And many other models specifying this part.
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 serve as a high-strength, self-aligning pivot point in primary flight control systems, including:
Connecting aileron push-pull rods to bellcranks and aileron horns.
Connecting flap push-pull rods to flap actuators and flap track linkages.
Why Choose S1104-3?
The integrity of the flight control system is the most critical aspect of an aircraft's airworthiness. Worn rod end bearings introduce "slop" or free play into the system, which can lead to degraded control response, control surface oscillation, and potentially catastrophic aerodynamic flutter. The genuine Textron OEM S1104-3 is the only part guaranteed to be manufactured from the correct, certified materials with the proper bearing clearances and load ratings. The use of a non-certified, industrial-grade heim joint would introduce an unacceptable risk of material failure, premature wear, or seizure of a primary flight control.
The S1104-3 rod end's ability to accommodate misalignment is due to its integral spherical plain bearing. This component functions as a spatial linkage joint, allowing for both rotational motion around the bearing's axis and angular tilting of the inner spherical ball relative to the outer race. This is fundamentally different from a simple bushing, which only permits rotation on a single axis. This multi-axis freedom is essential in an aircraft wing, which is a semi-rigid structure designed to flex under aerodynamic loads. As the wing flexes, the geometric relationship between a bellcrank mounted on a rib and a control horn on a moving aileron changes. The spherical bearing in the S1104-3 automatically compensates for this dynamic misalignment, preventing the push-pull rod from being subjected to dangerous bending stresses and ensuring the control system operates without binding. The bearing's race is often made of a self-lubricating bronze alloy or lined with a material like PTFE, providing a low-friction tribological surface that prevents galling and ensures smooth control feel.
Note: This is a primary flight control, flight-critical component. It is a wear item and must be inspected for any signs of radial or axial free play ("slop"), corrosion, or binding in accordance with the aircraft maintenance manual. Installation must be performed by a certified A&P mechanic. The number of exposed threads and the proper tightening of the jam nut are critical rigging adjustments that must be performed as specified in the maintenance manual to ensure both correct control travel and full structural strength of the connection.
Documentation
All technical data, installation procedures, and rigging specifications for the S1104-3 rod end bearing 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.