350-3-0085 - Textron Aviation OEM King Air 350 Hydraulic Hose Assembly Replaces S1167-3-0085

350-3-0085 – Textron Aviation King Air 350 Hydraulic Hose Assembly

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The 350-3-0085 is a genuine Textron Aviation (Beechcraft) OEM, flight-critical high-pressure hydraulic hose assembly. This is not a simple hose; it is a complete, factory-fabricated component engineered to transmit hydraulic power at thousands of PSI to critical systems on the Beechcraft King Air 350. As a flexible conduit, it is designed to accommodate the movement of components such as the landing gear and flight controls while maintaining full system pressure and integrity.

This hose assembly is a life-limited component with a mandatory replacement interval based on its date of manufacture. The internal elastomeric liner degrades over time, and replacement is essential to prevent in-flight failure. Each assembly is constructed from specialized materials, including a synthetic rubber inner tube, high-tensile stainless steel wire reinforcement, and a durable, abrasion-resistant outer cover. The end fittings are permanently swaged for a connection that is stronger than the hose itself. The failure of a high-pressure hydraulic hose can lead to a rapid loss of system fluid, resulting in the failure of the landing gear, brakes, or flight controls, and creating a severe fire hazard.

Key Features

• Genuine Textron Aviation OEM Part: Guarantees the correct length, material composition, pressure rating, and fitting orientation as specified in the aircraft's type design.

• High-Pressure Stainless Steel Braid Reinforcement: Features one or more layers of braided, high-tensile corrosion-resistant steel (CRES) wire, providing the strength to contain system pressures up to 3000 PSI.

• Compatible with MIL-PRF-5606/83282 Fluids: The synthetic rubber inner tube is specifically formulated for long-term compatibility with standard red petroleum-based and synthetic hydrocarbon-based aircraft hydraulic fluids.

• Permanently Swaged CRES End Fittings: The corrosion-resistant steel end fittings are permanently crimped onto the hose using a high-pressure swaging process, creating a leak-proof, blow-off-proof connection.

• Life-Limited Component for Maximum Safety: Manufactured with a specific cure date that determines its service life, ensuring that age-degraded hoses are removed from service before they can fail.

Technical Specifications

• Part Number: 350-3-0085

• Component Type: High-Pressure Hydraulic Hose Assembly

• OEM Manufacturer: Textron Aviation (Beechcraft)

• Construction:

  • Inner Tube: Synthetic Rubber (e.g., Nitrile) compatible with petroleum-based fluids.

  • Reinforcement: Braided Corrosion-Resistant Steel (CRES) Wire.

  • Outer Cover: Abrasion-Resistant Synthetic Rubber (e.g., Neoprene), typically perforated.

• End Fittings: Permanently Swaged, Corrosion-Resistant Steel.

• Operating Pressure: Designed for 3000 PSI hydraulic systems.

• Service Life: Finite life, determined by the date of manufacture (cure date) printed on the hose layline.

Aircraft Compatibility

This hydraulic hose assembly is specifically designed for use on the Beechcraft King Air 350 series of aircraft.

Crucial Note: The specific location and applicability for a given aircraft serial number must be verified using the latest revision of the official Textron Aviation (Beechcraft) Illustrated Parts Catalog (IPC).

Applications

The 350-3-0085 is used to transmit high-pressure hydraulic fluid to various moving components on the airframe. Common applications include flexible lines for:

• Landing Gear Actuation System

• Brake System

• Nose Wheel Steering System

• Hydraulically-Actuated Flight Controls

Why Choose 350-3-0085?

Choosing the genuine Textron 350-3-0085 is an absolute requirement for flight safety. The failure of a high-pressure hydraulic hose in flight is a catastrophic event. Using a non-certified, locally fabricated hose introduces unacceptable risks of incorrect materials, improper fabrication techniques, and unknown service history. The genuine OEM hose assembly is the only part that is manufactured and tested under the original, approved production certificate, guaranteeing its quality, reliability, and airworthiness. For a life-limited, flight-critical component, there is no substitute.

The structural integrity of the 350-3-0085 hose assembly is primarily derived from its stainless steel wire braid reinforcement. This braid is a precisely woven sheath that acts as the main pressure-containing member of the assembly. The wire is braided at a specific, neutral angle (approximately 54.7 degrees) which creates an equilibrium of forces. This angle ensures that when the hose is pressurized, the radial expansion and axial contraction forces are perfectly balanced, preventing the hose from changing in length and minimizing stress on the wire braid itself. The elastomeric inner tube serves only as a fluid-impermeable liner. The most insidious failure mode for an age-expired hose is the development of microscopic cracks in this inner tube. These cracks allow high-pressure hydraulic fluid to seep into the wire braid. This can lead to hidden corrosion and fatigue of the individual wire strands, dramatically reducing the hose's burst strength and setting the stage for a sudden, unannounced rupture under a normal system pressure spike. This is the fundamental engineering reason why flexible hydraulic hoses are life-limited and must be replaced based on their age (cure date), regardless of their external appearance.

Note: This is a flight-critical, life-limited component. It MUST be replaced on or before its expiration date, which is calculated from the cure date printed on the hose layline. Do not install an expired hose under any circumstances. During installation, care must be taken to avoid twisting the hose (the printed layline must remain straight), exceeding the minimum specified bend radius, or allowing the hose to chafe against the surrounding structure. Installation must be performed by a certified A&P mechanic.

Documentation

The definitive part number applicability, service life limits, and all installation procedures are detailed in the applicable Textron Aviation (Beechcraft) King Air 350 Series Illustrated Parts Catalog (IPC) and Maintenance Manual.