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FCA-25751 – Textron Aviation OEM Gasket for King Air Aircraft
Available now on the Airparts.aero Marketplace.
Overview
The Textron Aviation FCA-25751 is a flight-critical, OEM gasket specifically engineered for the exhaust system of the Pratt & Whitney Canada PT6A turboprop engine installations on Beechcraft King Air series aircraft. This precision-cut gasket is designed to create a positive, high-temperature seal at the joint between the engine's exhaust duct and the airframe's exhaust eductor or ejector assembly. Its primary function is to prevent the leakage of extremely hot, high-velocity exhaust gases into the engine nacelle, a failure of which could lead to a catastrophic in-flight fire, damage to critical structural components, and engine power loss.
Manufactured from a specialized, high-temperature metallic or composite material, the FCA-25751 is built to withstand the severe operational environment of a turboprop exhaust. This includes extreme temperatures exceeding 1000°F (538°C), significant thermal cycling, high-frequency vibration, and a corrosive chemical environment. The gasket's controlled compressibility and material resilience are critical for maintaining a gas-tight seal as the exhaust components expand and contract with temperature changes. The use of a genuine Textron Aviation OEM gasket is non-negotiable for ensuring the safety and integrity of the King Air's powerplant installation.
Key Features
OEM Certification: Genuine Textron Aviation (Beechcraft) part, guaranteeing correct material, dimensions, and performance for this critical application.
Extreme Temperature Resistance: Fabricated from materials specifically selected to maintain their mechanical properties and sealing integrity at the very high temperatures of turboprop exhaust gases.
Thermal Cycling Durability: Engineered to withstand thousands of heating and cooling cycles without cracking, warping, or loss of sealing force.
Precision Die-Cut: Manufactured to exact dimensions for a perfect fit, ensuring uniform clamping pressure and a reliable seal.
Flight-Critical Safety Component: Essential for preventing nacelle fires and protecting surrounding engine components and airframe structure.
Corrosion Resistance: Designed to resist the corrosive byproducts of combustion present in the engine exhaust stream.
Technical Specifications
Part Number: FCA-25751
Component Type: High-Temperature Exhaust Gasket
OEM Manufacturer: Textron Aviation (Beechcraft)
Application: PT6A Engine Exhaust Duct to Eductor/Ejector Joint
Material: Typically a specialized high-temperature alloy (e.g., Stainless Steel, Inconel) or a metal-reinforced composite material with a graphite or mica core. Specific material composition must be verified by the OEM Certificate of Conformance (CofC).
Governing Specifications: Manufactured to Textron Aviation proprietary specifications and meets all applicable FAA airworthiness standards for powerplant installations.
Aircraft Compatibility
Beechcraft (Textron Aviation): King Air 200, B200, 300, 350 Series and other models equipped with specific PT6A engine and exhaust configurations.
Note: This is a partial list of common applications. The aircraft's specific Illustrated Parts Catalog (IPC) for its given serial number is the final and absolute authority for determining part applicability.
Applications
Exhaust Gas Sealing: Creates a gas-tight seal at the flange connection between the engine exhaust stacks and the eductor assembly.
Fire Prevention: Acts as a critical firewall barrier, containing high-temperature gases within the exhaust system and preventing their escape into the nacelle.
Vibration Damping: The gasket material provides a degree of damping between the two joined components, helping to mitigate vibrational fatigue.
Why Choose FCA-25751?
An exhaust leak on a turboprop engine is a severe safety hazard. The FCA-25751 is not a generic gasket; it is an engineered component designed for an extreme environment. Using a non-certified part made from incorrect materials can lead to rapid failure through thermal degradation, erosion from high-velocity gases, or loss of clamping force. Such a failure could allow superheated exhaust to impinge directly on fuel lines, electrical wiring, or primary structural elements within the nacelle, creating an immediate risk of an uncontrollable in-flight fire. Sourcing a genuine, traceable Textron Aviation FCA-25751 is a critical step in ensuring the airworthiness and safety of the aircraft.
The engineering challenge in designing the FCA-25751 gasket lies in accommodating the differential thermal expansion between the engine exhaust duct and the airframe's eductor assembly. These components, often made of dissimilar nickel or cobalt-based superalloys and stainless steels, expand at different rates when heated to over 1000°F. The gasket must be compliant enough to be compressed and form an initial seal under clamping load (torque) at ambient temperature, yet possess sufficient resilience and "spring-back" to maintain a positive sealing stress as the flange gap changes dynamically during thermal cycling. High-end exhaust gaskets often employ a solid metal carrier, sometimes with embossed features to concentrate sealing stress, bonded to a compressible, oxidation-resistant core like high-purity graphite. This composite construction allows the gasket to maintain a gas-tight seal despite the microscopic movements and flange distortions inherent in a turboprop exhaust system.
Note: The FCA-25751 is a flight-critical, single-use component. It must be replaced any time the exhaust joint is separated. Installation must be performed by a certified A&P/IA mechanic in strict accordance with the current Textron Aviation King Air maintenance manual. All flange surfaces must be clean, flat, and free of defects. Fasteners must be tightened to the specified torque value and sequence to ensure proper gasket compression.
Documentation
No public-facing OEM or regulatory specification sheet was located for this specific part number. All authoritative technical data, installation procedures, and torque specifications are contained within the official Textron Aviation King Air Series Maintenance Manual and Illustrated Parts Catalog (IPC).
