40-140C – Cleveland Wheels Tail Wheel Assembly ⚙️
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Overview
The Cleveland Wheels 40-140C Tail Wheel Assembly is a high-quality, certified replacement unit designed for various tailwheel-equipped light general aviation (GA) aircraft. This assembly is a complete, non-steerable or full-swiveling unit—depending on the aircraft configuration—engineered to provide reliable ground handling, stability, and control for the aircraft's aft section. The "C" suffix denotes a design evolution or improvement over previous 40-140 and 40-140A/B models, typically incorporating updated materials, sealing, or bearing configurations for enhanced durability and reduced maintenance.
The tail wheel's primary function is to support the aircraft's aft static load and manage taxiing, pivoting, and ground maneuvering. In flight, the tailwheel's design is critical for minimizing drag and resisting rotational vibration. The assembly includes the yoke (fork), the wheel hub, a pneumatic tire, and the requisite bearings and axle hardware. As a certified component, the 40-140C ensures compatibility with the aircraft's leaf spring or bungee attachment system, providing the necessary operational safety margin and dimensional accuracy.
Key Features
High-Strength Yoke/Fork: The structural component is typically cast or forged from high-strength aluminum alloy or steel, engineered to withstand the repeated shock and side loads encountered during landings and ground turns.
Tapered Roller Bearing Integration: Utilizes high-capacity tapered roller bearings within the wheel hub to efficiently handle both radial and axial loads, maximizing bearing life and reducing rolling resistance.
Corrosion-Resistant Finish: All metallic components are treated or plated to resist corrosion from moisture, mud, and environmental contaminants common during ground operations.
Divided Wheel Hub: The wheel hub is often a two-piece, divided design secured by tie bolts, facilitating easy tire and tube servicing without specialized disassembly tools.
Pneumatic Tire Interface: Designed to accommodate a specific low-pressure, high-ply-rating pneumatic tire, ensuring adequate cushioning and traction on various surface types.
Technical Specifications
Part Number: 40-140C
Component Type: Tail Wheel Assembly (Complete)
OEM Manufacturer: Cleveland Wheel & Brake Systems (A Signia Aerospace Company)
Certification Type: FAA-PMA or TSO-C26c equivalent (Component must be certified for the specific application).
Compatible Tire Size: Typically uses a tire size around 6 inches to 8 inches nominal diameter (Specific size must be verified against aircraft TCDS and CMM).
Hub/Rim Type: Divided Wheel Hub (Specific part numbers for wheel halves will be in the CMM).
Bearings: Requires two sets of high-load tapered roller bearings (Specific bearing cone/cup P/Ns verified via CMM).
Load Rating: Engineered for the maximum tail-down static and dynamic load of the applicable aircraft.
Steering Mechanism Interface: Designed to accept the steering horn/linkage or feature a full swiveling (castering) capability with a locking pin.
Aircraft Compatibility
Primary Usage: A common and highly sought-after assembly used across a wide range of light, conventional-gear (tailwheel) aircraft, including classic models from:
Piper: PA-18 Super Cub, PA-20/22 Pacer/Tri-Pacer conversions.
Cessna: C-120/140/170 series.
Stout/Experimental Aircraft: Common upgrade or OEM fitment.
System Integration: Attaches to the aircraft's Tail Gear Spring or mounting bracket.
Verification Note: The Aircraft Type Certificate Data Sheet (TCDS) and the Cleveland Component Maintenance Manual (CMM) are the definitive and final authority for part applicability.
Applications Section
The 40-140C Tail Wheel Assembly is fundamental to the aircraft's ground control phase:
Ground Steering and Pivoting: Enables precise directional control during taxiing via rudder pedals (if steerable) or differential braking (if full swiveling).
Shock Absorption: Works in conjunction with the tail spring to absorb ground impact loads during tail-down landings and taxi bumps.
Static Support: Safely supports the aft weight of the aircraft during parking and maintenance.
Why Choose the 40-140C Cleveland Tail Wheel Assembly?
The tail wheel is arguably the single component that experiences the most shock and abuse on a conventional gear aircraft. Choosing the Cleveland 40-140C certified assembly ensures the unit's structural fatigue life is validated for its intended purpose. Uncertified or worn-out assemblies often suffer from rapid bearing wear, yoke cracking, or failure of the mounting hardware. The Cleveland design focuses on robust bearing retention and high material integrity to prevent lateral collapse under hard turning, a critical safety feature. This certified component ensures reliable steering linkage integrity and minimizes the risk of ground loop incidents caused by tailwheel failure.
The design of the 40-140C is optimized for managing the complex stress field generated during a pivot turn, which involves simultaneous compression, shear, and torsion loads on the yoke assembly. The use of tapered roller bearings is crucial because they are inherently designed to handle large combined radial and axial (thrust) loads, which are unavoidable during tight ground maneuvers. The proper setting of the bearing end-play is paramount for maximizing bearing life and preventing wheel wobble. The fatigue life of the yoke's attachment points is governed by its material's endurance limit, where certified materials ensure crack propagation is resisted under the high-cycle, low-amplitude vibration experienced during taxiing.
Note: The 40-140C Tail Wheel Assembly is a fatigue-critical component subject to mandatory overhaul limits. It must be disassembled, cleaned, and inspected per the Cleveland Component Maintenance Manual (CMM) at required intervals. Critical inspection includes Non-Destructive Testing (NDT) for cracks in the yoke and measurement of bearing bore integrity. Proper bearing pre-load/end-play setting is non-negotiable for safe operation. Installation and inspection must be performed and certified by a licensed A&P mechanic in strict accordance with the CMM and the aircraft's Maintenance Manual.
Documentation
Authoritative documentation for this component includes:
Cleveland Wheel and Brake Systems Component Maintenance Manual (CMM) for 40-140C.
Consult the aircraft's Type Certificate Data Sheet (TCDS) for approved installations.
FAA Advisory Circular AC 43.13-1B: General guidance on wheel bearing installation and maintenance.