61475-14-43.5 - Textron Aviation Cessna OEM Washer Assembly

61475-14-43.5 – Textron Aviation Cessna OEM Washer Assembly

Available now on the Airparts.aero Marketplace.

Overview

The Textron Aviation 61475-14-43.5 is a genuine OEM, flight-critical washer assembly, engineered for one of the most demanding applications on an aircraft: securing the propeller to the engine flange on the Cessna 208 and 208B Caravan. This is not a standard flat washer; it is a high-strength, precision-ground component designed to be placed under the propeller mounting nuts. Its purpose is to provide a perfectly flat, hardened bearing surface and to uniformly distribute the immense clamping force of the torqued nuts. Manufactured from a superior-grade steel alloy, this washer assembly is essential for maintaining the integrity of the propeller installation.

Key Features

• Primary Structural Application: A critical component in the propeller mounting hardware stack. It is responsible for distributing the clamp load from the mounting nuts to the propeller hub, ensuring a secure and uniform attachment.
• High-Strength, Hardened Steel: Fabricated from a high-tensile strength steel alloy and heat-treated to a specific hardness. This prevents the washer from deforming, galling, or "cupping" under the extremely high torque values required for propeller installation, which is essential for maintaining bolt preload.
• Precision Ground Surfaces: Both faces of the washer are precision-ground to be perfectly flat and parallel. This provides a uniform bearing surface, which is critical for achieving an accurate torque reading and ensuring the clamp load is applied evenly.
• Corrosion-Resistant Finish: Plated with a durable finish to provide robust protection against corrosion from moisture and other environmental factors, ensuring the long-term integrity of the propeller attachment joint.
• Genuine Textron OEM Part: As a genuine factory component, it guarantees conformance to the stringent material, heat treatment, and dimensional specifications required by the aircraft's original Type Certificate.

Technical Specifications

• Part Number: 61475-14-43.5
• Component Type: Propeller Mounting Washer Assembly
• Material: High-Strength, Heat-Treated Steel Alloy
• Finish: Corrosion-Resistant Plating
• Primary Function: Distributes clamping force of propeller mounting nuts.
• Certification: FAA Production Approval

Aircraft Compatibility

The 61475-14-43.5 is the specified OEM propeller mounting washer for the Cessna Caravan, one of the most successful utility turboprop aircraft in the world.

• Primary Aircraft Models:
  • Cessna 208 Caravan
  • Cessna 208B Grand Caravan / Super Cargomaster

Applications

The 61475-14-43.5 has a singular, flight-critical application:

• Propeller Installation: Used under each of the propeller mounting nuts to secure the propeller assembly to the engine's propeller shaft flange.
• Mandatory Replacement Item: Propeller mounting hardware is often subject to mandatory life limits or must be replaced any time the propeller is removed for overhaul or after a propeller strike event.

Why Choose 61475-14-43.5?

The joint between the propeller and the engine is subjected to the full thrust of the engine, immense centrifugal forces, and complex vibratory loads. A failure of any component in this joint would be catastrophic. The 61475-14-43.5 washer is a critical part of ensuring this joint maintains its preload and integrity. Using a genuine Textron Aviation OEM part is the only way to ensure the washer is made from the certified steel alloy with the correct hardness to prevent deformation under load. For a component this vital to safety, there is no substitute.

Order Your 61475-14-43.5 Washer Assemblies Now

Ensure the safety and integrity of your aircraft's propeller installation with genuine, flight-critical OEM hardware. Visit Airparts.aero to order your Textron Aviation 61475-14-43.5 washer assemblies today.

The 61475-14-43.5 washer assembly is fundamental to achieving and maintaining the correct preload in the propeller mounting studs. Preload, or the tension in the studs, is what creates the powerful clamping force that holds the propeller flange tightly against the engine flange. This friction grip is what actually prevents the propeller from shifting or shearing the studs. The hardened steel surface of the 61475-14-43.5 washer provides a consistent, low-friction surface for the nut to turn against, allowing the mechanic's applied torque to be converted into the correct amount of stud tension. A soft or standard washer would gall or deform, giving a false torque reading and resulting in insufficient and unsafe clamp load.

Note: This is a flight-critical structural component. It must be installed by a certified A&P mechanic with experience in propeller systems, in strict accordance with the current Textron Aviation maintenance manual. Propeller mounting nuts must be tightened in a specific sequence using a calibrated torque wrench to the precise value specified in the manual.