S9413-628 - Textron Aviation OEM Preformed Packing

S9413-628 – Textron Aviation OEM Preformed Packing

Available now on the Airparts.aero Marketplace.

Overview

The Textron Aviation S9413-628 is a genuine OEM, flight-critical preformed packing O-ring, engineered to a proprietary Cessna specification for sealing key components in aircraft fuel systems. This is not a standard MS or AN O-ring; it is a seal with specific dimensions and material properties defined by Textron's engineers for a perfect fit and function. Fabricated from a high-performance Fluorocarbon (FKM) elastomer, it is designed to provide a positive, leak-proof seal against aviation fuels while withstanding the demanding conditions of the airframe environment.

Key Features

• High-Performance Fluorocarbon (FKM) Material: Fabricated from a Viton® (FKM) or equivalent fluorocarbon elastomer. This material provides exceptional resistance to chemical degradation and maintains its sealing integrity when in constant contact with aviation fuels.
• Superior Fuel Resistance: Specifically formulated for long-term, continuous exposure to 100LL Avgas and other petroleum-based fluids. It is highly resistant to swelling, hardening, and permeation, ensuring a durable, long-lasting seal.
• Proprietary Dimensions: Manufactured to a specific, non-standard dimensional specification controlled by Textron Aviation's engineering drawings. This ensures a perfect fit and the correct amount of "squeeze" in its intended application, which is critical for a reliable seal.
• Prevents Fuel Leaks & Contamination: Creates a tight, reliable seal that prevents fuel from leaking from system components and also prevents water and other contaminants from entering the fuel system.
• Genuine Textron OEM Part: As a genuine factory component, it guarantees the correct material compound, durometer (hardness), and proprietary dimensions required for a safe, airworthy, and long-lasting installation in a critical fuel system.

Technical Specifications

• Part Number: S9413-628
• Component Type: Fuel System O-Ring Seal
• Material: High-Temperature, Fuel-Resistant Fluorocarbon Elastomer (FKM / Viton®)
• Primary Function: Provides a static seal on fuel system components like fuel caps, selectors, and strainers.
• Size: Proprietary, non-standard dash size.
• Certification: FAA Production Approval

Aircraft Compatibility

The S9413-628 is a critical sealing component on a vast number of Cessna's most popular single and multi-engine aircraft. It is imperative to consult the specific aircraft's Illustrated Parts Catalog (IPC) for final verification of applicability.

• Common Aircraft Series:
  • Cessna 100 Series: 152, 172 Skyhawk, 177 Cardinal, 182 Skylane
  • Cessna 200 Series: 206 Stationair, 210 Centurion
  • Cessna 300 Series: 310, 337 Skymaster, 340

Applications

The S9413-628 is the specified OEM component for ensuring the integrity of various fuel system seals:

• Fuel Cap Seal: A common application is as the primary seal that prevents fuel from leaking from the filler cap and water from entering the tank.
• Fuel Selector & Strainer Valves: Used to seal the body or associated components of fuel selector and strainer assemblies, preventing dangerous fuel leaks.
• Mandatory Replacement Item: Must be replaced whenever a fuel component is serviced to ensure a fresh, reliable seal.

Why Choose S9413-628?

A fuel leak, no matter how small, is a significant safety hazard. The S9413-628 O-ring is the genuine, factory-specified component designed to prevent leaks at some of the most common service points in the fuel system. Using a genuine Textron Aviation OEM part is the only way to ensure the seal is made from the correct FKM compound and, most importantly, has the precise proprietary dimensions for the application. Substituting with a standard-size O-ring, even of the same material, can result in an improper fit and a dangerous fuel lea

Order Your S9413-628 O-Rings Now

Ensure a leak-free, airworthy fuel system with a genuine Textron Aviation OEM seal. Visit Airparts.aero to order your S9413-628 O-rings today.

The S9413-628 O-ring's Fluorocarbon (FKM) material is essential for its application as a fuel seal. Aviation gasoline (100LL) is a complex mixture of hydrocarbons, including a significant percentage of aromatic compounds like Toluene and Xylene. These aromatics are aggressive solvents that cause standard Nitrile (Buna-N) rubber to swell, soften, and lose its physical properties, leading to leaks. The high fluorine content in the FKM polymer chain makes it exceptionally resistant to this chemical attack. It maintains its durometer (hardness) and compression set resistance even after prolonged immersion in fuel, ensuring a consistent and reliable sealing force for the life of the component.

Note: This is a single-use, flight-critical sealing component. It must be replaced whenever the component it seals is removed. Ensure all sealing surfaces are meticulously clean, dry, and free of nicks or scratches before installation. Lubricate the O-ring with clean engine oil or a compatible lubricant before assembly to prevent damage.