AS3209-015 - Textron Aviation OEM Packing Preformed Fluorocarbon O-Ring

AS3209-015 – Textron Aviation OEM Fluorocarbon (Viton®) Boss Seal O-Ring

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Overview

The AS3209-015 is a high-performance, preformed O-ring packing seal that holds dual authority as a component built to the exacting Aerospace Standard (AS3209) and as a genuine Textron Aviation Original Equipment Manufacturer (OEM) part. This O-ring is fabricated from a Fluorocarbon (FKM) elastomer, a material widely known by its DuPont trade name, Viton®, and is specifically engineered for creating a static seal on AS568-015 size straight thread tube fittings in high-temperature system bosses.

The FKM material gives this O-ring an exceptional operational temperature range, up to 400°F (204°C), making it the specified component for applications where standard Nitrile (NBR) O-rings would fail. As a genuine Textron Aviation part, this AS3209-015 seal is the factory-specified component for numerous high-temperature connections on Cessna, Beechcraft, and Hawker aircraft, guaranteeing the correct material compound and performance.

Key Features

• Textron Aviation OEM Certified: Guarantees the part is the factory-approved, fully traceable component for the Textron Aviation family of aircraft.

• High-Temperature Fluorocarbon (FKM): Fabricated from a Viton® or equivalent FKM elastomer, providing a continuous service temperature rating of up to 400°F (204°C).

• Designed for Static Boss Seals: Specifically sized (AS568-015) for static axial sealing of fittings in their corresponding ports.

• Excellent Fluid Resistance: Offers superior chemical resistance to a wide range of petroleum-based and synthetic lubricating oils, hydraulic fluids, and jet fuels.

• 75 Durometer Hardness: The 75 Shore A hardness provides an excellent balance of sealing force and resistance to deformation for standard pressure applications.

• AS Standard Compliance: Meets all dimensional, material, and quality requirements of AS3209, ensuring airworthiness and interchangeability.

Technical Specifications

• Part Number: AS3209-015

• Component Type: Preformed O-Ring Packing, Boss Seal

• OEM Authority: Textron Aviation

• Governing Specification: AS3209

• Material: Fluorocarbon Elastomer (FKM / Viton®)

• Hardness: 75 ± 5 Durometer Shore A

• Color (Typical): Brown

• Dimensions (AS568-015):

  • Inside Diameter (ID): 0.551 inches

  • Cross-Section (CS): 0.070 inches

• Typical Temperature Range: -15°F to +400°F (-26°C to +204°C)

Aircraft Compatibility

As a Textron Aviation OEM part, this O-ring is specified for numerous high-temperature fluid connections on their aircraft. The underlying AS standard makes it common across the industry.

• Primary Textron Aviation Platforms:

  • Cessna Citation Series Business Jets

  • Beechcraft King Air Series

  • Hawker Business Jets

• General Aerospace Usage: Used in any aerospace application requiring a high-temperature resistant boss seal for a -015 size fitting.

Note: Verification of applicability is the responsibility of the installer. Always consult the current version of the aircraft or engine's Illustrated Parts Catalog (IPC) to confirm part number eligibility.

Applications

• Sealing of straight thread fittings and other port connections on firewall-forward components.

• Connections on engine accessories such as fuel control units, oil filter housings, and hydraulic pumps.

• Hydraulic and fuel lines located in close proximity to high-temperature bleed air ducts or exhaust components.

Why Choose this AS3209-015?

This component provides the dual assurance of meeting the public AS aerospace standard and the specific endorsement of Textron Aviation. This guarantees the seal's physical properties and, critically, ensures that the specific FKM compound used is the one tested and approved for the system fluids on Textron aircraft. Using the genuine OEM part is the only way to guarantee you are installing the correct, certified high-temperature material required for a safe and airworthy repair.

While "Fluorocarbon" or "FKM" defines a class of elastomer, it is not a single material. There are multiple FKM polymer types (e.g., Type A, B, F, GLT) with varying fluorine content and cure chemistries, each offering a different balance of properties. An aircraft manufacturer like Textron Aviation will specify a particular FKM compound from a qualified manufacturer that has been rigorously tested for compatibility with the specific hydraulic fluids, oils, and fuels used in their aircraft. Sourcing the AS3209-015 as a Textron OEM part provides a critical assurance that you are not just getting any FKM O-ring that meets the dimensional standard, but the exact FKM compound that has been certified for long-term, reliable service in that specific aircraft's chemical environment. This is a level of engineering detail and safety assurance that a generic part cannot provide.

Note: This component has a finite shelf life defined by standards like ARP5316. The cure date marked on the packaging must be verified prior to installation. It is a single-use part; a new O-ring must be used every time a fitting is reinstalled. The port and fitting sealing surfaces must be impeccably clean and free of scratches or damage. The O-ring must be lubricated with clean system fluid before installation.

Documentation

The base standard for this part is the Aerospace Standard AS3209. This is a controlled document managed by SAE International. OEM-specific application and installation data is contained within the Textron Aviation maintenance and parts manuals.