AS3582-007 - Textron Aviation OEM Silicone O-Ring

AS3582-007 – Textron Aviation OEM EPDM Phosphate Ester Hydraulic O-Ring

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Overview

The AS3582-007 is a flight-critical, preformed O-ring packing seal, supplied with the full certification and traceability of Textron Aviation as an Original Equipment Manufacturer (OEM) component. It is manufactured in strict accordance with Aerospace Standard (AS) 3582, which explicitly defines the material requirements for O-rings used in phosphate ester-based hydraulic fluid systems. Therefore, this O-ring is fabricated from a specialized Ethylene Propylene Diene Monomer (EPDM) rubber compound. It is crucial to note that the AS3582 standard specifies EPDM rubber, not Silicone rubber, due to chemical compatibility requirements. Silicone is incompatible with phosphate ester fluids like Skydrol®.

This EPDM O-ring is engineered for its exceptional resistance to degradation from Skydrol®, HyJet™, and similar hydraulic fluids commonly used in transport category and business aircraft. The -007 suffix designates the O-ring's size according to the AS568 dimensional standard. Its primary function is to create a positive, leak-free static seal in the demanding chemical and thermal environment of these hydraulic systems. Using the genuine Textron OEM AS3582-007 O-ring is essential for maintaining hydraulic system integrity and flight safety.

Key Features

• Genuine Textron Aviation OEM Part: Guarantees the part is the factory-specified and fully certified component, ensuring correct material and performance.

• Phosphate Ester Fluid Compatible: Fabricated from a specialized EPDM compound specifically formulated for long-term resistance to Skydrol® and other phosphate ester hydraulic fluids.

• AS3582 Standard Compliance: Guarantees adherence to the aerospace standard for material composition, physical properties, dimensional tolerances, and quality control for EPDM O-rings.

• AS568 Size -007: Precisely dimensioned according to the AS568-007 standard for a perfect fit in corresponding glands.

• Distinctive Purple Color: Typically purple in color for positive visual identification, preventing accidental installation in petroleum-based fluid systems where EPDM is incompatible.

• Designed for Static Sealing: Provides a reliable seal between two stationary surfaces under hydraulic pressure.

Technical Specifications

• Part Number: AS3582-007

• Component Type: Preformed O-Ring Packing Seal

• OEM Authority: Textron Aviation

• Governing Specification: AS3582

• Material: Ethylene Propylene Diene Monomer (EPDM) Rubber ( Not Silicone )

• Hardness: 70 ± 5 Durometer Shore A

• Color (Typical): Purple

• Dimensions (AS568-007):

  • Inside Diameter (ID): 0.145 inches

  • Cross-Section (CS): 0.070 inches

• Typical Temperature Range: -65°F to +300°F (-54°C to +149°C)

• Compatible Fluids: Phosphate Ester Hydraulic Fluids (e.g., Skydrol®, HyJet™)

• Incompatible Fluids: Petroleum-based fluids (fuel, oil, mineral hydraulic fluid), hydrocarbon solvents, Silicone fluids.

Aircraft Compatibility

As a Textron Aviation OEM part conforming to AS3582, this O-ring is specified for the hydraulic systems of Textron aircraft utilizing phosphate ester fluids.

• Primary Textron Aviation Platforms:

  • Cessna Citation Series Business Jets (Models specifying phosphate ester fluid)

  • Hawker Business Jets (Models specifying phosphate ester fluid)

• General Aerospace Usage: Applicable to any certified aircraft hydraulic system requiring an AS3582-007 EPDM O-ring for phosphate ester fluid compatibility.

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

Applications

• Static sealing in hydraulic system components operating with phosphate ester fluids, including:

  • Tube fittings

  • Valves

  • Actuators

  • Pumps and reservoirs

  • Brake system components

Why Choose this AS3582-007?

Material compatibility in aircraft hydraulic systems is absolutely critical and non-negotiable. Phosphate ester fluids like Skydrol® will catastrophically degrade common seal materials like Nitrile, Fluorocarbon, and Silicone. Only EPDM, manufactured to the AS3582 standard, is suitable. Using the genuine Textron OEM AS3582-007 O-ring provides the dual assurance of meeting the public aerospace standard and the specific endorsement of the airframe manufacturer, guaranteeing the correct EPDM material and preventing potentially disastrous hydraulic system leaks or failures.

The chemical resistance of the AS3582-007 O-ring stems from the molecular structure of Ethylene Propylene Diene Monomer (EPDM). EPDM is a non-polar synthetic rubber, characterized by a saturated polymer backbone derived from ethylene and propylene monomers, with a small amount of a diene monomer incorporated to allow for sulfur vulcanization. This predominantly non-polar, saturated structure is key to its performance. Phosphate ester fluids like Skydrol® are highly polar. According to the chemical principle "like dissolves like," the non-polar EPDM is largely resistant to attack and swelling by these polar fluids. Conversely, petroleum-based oils and fuels are non-polar hydrocarbons, which readily attack and swell the non-polar EPDM. Silicone rubbers, while having a wide temperature range due to their siloxane backbone, lack the chemical structure needed to resist the aggressive phosphate ester chemistry and would fail rapidly in this application. The AS3582 standard ensures the correct EPDM polymer and cure system are used for optimal performance in Skydrol®.

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. Meticulous cleanliness is required during installation. The O-ring must be lubricated only with clean system hydraulic fluid (Skydrol®) or an approved phosphate ester-compatible lubricant. Never use petroleum-based grease, oil, or silicone grease for lubrication. Ensure positive identification; this EPDM O-ring is typically purple, whereas Silicone O-rings are often red or orange.

Documentation

The base standard for this part is Aerospace Standard AS3582. 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.