S9413-558 – Textron Genuine OEM O-Ring
Available now on the Airparts.aero Marketplace.
Overview
The Textron S9413-558 is a genuine OEM, flight-critical preformed packing O-ring, engineered to a proprietary Cessna specification for use as a primary fuel cap seal. This is not a standard hardware O-ring; it is a seal with specific dimensions and material properties defined by Textron's engineers to create a positive, leak-proof barrier on the fuel tanks of a vast range of Cessna aircraft. Fabricated from a high-performance Fluorocarbon (FKM) elastomer, it is designed to prevent fuel siphoning and water contamination while withstanding constant exposure to aviation fuels and harsh environmental conditions.
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 Jet Fuel. It is highly resistant to swelling, hardening, and permeation, ensuring a durable, long-lasting seal against volatile fluids.
- Positive Sealing Action: Creates a tight, reliable seal that prevents fuel from leaking or siphoning from the filler neck during flight maneuvers and changes in atmospheric pressure. It also serves as the primary barrier preventing rainwater and de-icing fluids from contaminating the fuel supply.
- 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 the fuel cap groove for a reliable seal.
- Genuine Textron OEM Part: As a genuine factory component, it guarantees the correct material compound, durometer (hardness), and shelf-life controls required for a safe, airworthy, and long-lasting installation in a critical fuel system.
Technical Specifications
- Part Number: S9413-558
- Component Type: Fuel Cap O-Ring Seal
- Material: High-Temperature, Fuel-Resistant Fluorocarbon Elastomer (FKM / Viton®)
- Primary Function: Provides a static seal for aircraft fuel caps.
- Size: Proprietary, non-standard dash size.
- Certification: FAA Production Approval
Aircraft Compatibility
The S9413-558 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.
- Common Aircraft Series:
- Cessna 100 Series: 172 Skyhawk, 177 Cardinal, 182 Skylane
- Cessna 200 Series: 206 Stationair, 210 Centurion
- Cessna 300 Series: 310, 337 Skymaster, 340
- Cessna 400 Series: 402, 414, 421
Applications
The S9413-558 is the specified OEM component for ensuring the integrity of the fuel tank sealing:
- Fuel Cap Seal: The primary seal that prevents fuel from leaking from the filler cap and water from entering the tank.
- Preventative Maintenance: A common replacement item during annual inspections or any time the old seal is found to be hardened, cracked, or deformed.
- Mandatory Replacement Item: Must be replaced whenever a fuel cap is serviced or overhauled to ensure a fresh, reliable seal.
Why Choose S9413-558?
A missing or degraded fuel cap O-ring is a serious safety concern. It can allow rainwater to seep into the fuel tanks, leading to engine failure, and can allow fuel to siphon out of the tanks in flight, creating a fire hazard and reducing usable range. The S9413-558 is the genuine, factory-specified component designed to prevent these issues. Using a genuine Textron Aviation OEM part is the only way to ensure the seal has the correct proprietary dimensions and is made from the specified FKM compound capable of withstanding constant fuel exposure without deteriorating.
Order Your S9413-558 O-Rings Now
Ensure a leak-free, contaminant-free fuel system with a genuine Textron Aviation OEM seal. Visit Airparts.aero to order your S9413-558 fuel cap O-rings today.
The S9413-558 O-ring's Fluorocarbon (FKM) material is essential for its application as a fuel cap 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 should be replaced whenever the fuel cap is serviced or if the seal shows any signs of cracking, hardening, or deformation. Ensure all sealing surfaces are meticulously clean before installation. Lubricate the O-ring with clean engine oil or a compatible lubricant before assembly to prevent damage.