STD-2180 - Lycoming Rubber Hose

STD-2180 – Textron Aviation OEM Engine Hose for Lycoming Powerplants

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The STD-2180 is a genuine Textron Aviation standard part number for a reinforced hose, precision-cut for use in Lycoming engine installations on Textron airframes. While this hose is applied to a Lycoming powerplant and often referred to generically, it is critical for technicians to note that this is a Textron-specified component, governed by their engineering standards, not Lycoming's. Its most common application is as a rocker arm box oil drain hose, providing a flexible connection to return lubricating oil from the cylinder head's valve train back to the crankcase.

The use of this specific, OEM-specified hose is critical for flight safety. The material composition is engineered for long-term compatibility with aviation gasoline (Avgas), engine oil, and the high ambient temperatures found firewall-forward. Substituting this with a non-certified, commercial-grade hose can lead to rapid material degradation, resulting in oil leaks and creating a significant fire hazard.

Key Features

• Genuine Textron Aviation Standard Part: Guarantees perfect fit, form, and function as specified in the aircraft's original type design by the airframe manufacturer.

• Fuel and Oil Resistant Inner Tube: The synthetic rubber inner tube is specifically formulated to resist swelling, hardening, and degradation when exposed to hydrocarbon fuels and lubricating oils.

• Braided Fiber Reinforcement: An internal braided fiber layer provides excellent kink resistance and structural stability, ensuring the hose can withstand engine vibration and pressure pulses without collapsing or failing.

• Precision Pre-Cut Length: Cut to the exact 1.88-inch length required for its intended application, eliminating guesswork and ensuring a perfect fit without excess length or stress on the connections.

• Heat and Abrasion Resistant Outer Cover: The exterior of the hose is protected by a durable synthetic rubber cover designed to resist abrasion and the high radiant heat of the engine compartment.

Technical Specifications

• Part Number: STD-2180 (also referenced as STD2180)

• Component Type: Low-Pressure Reinforced Engine Hose

• Specifying OEM: Textron Aviation

• Material:

  • Inner Tube: Fuel/Oil-Resistant Synthetic Rubber (e.g., Nitrile / NBR)

  • Reinforcement: Braided Fiber (e.g., Cotton, Polyester)

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

• Governing Specification: Materials and construction typically conform to standards such as MIL-DTL-6000 for low-pressure aircraft fluid hose.

• Dimensions:

  • Inside Diameter (ID): 0.38 inches (3/8 in)

  • Length: 1.88 inches (1 7/8 in)

Aircraft Compatibility

The STD-2180 is a standard part used on numerous Textron Aviation (Cessna) aircraft equipped with Lycoming piston engines. It is commonly specified on, but not limited to, the following models:

• Cessna 172 Skyhawk (with Lycoming O-320/O-360)

• Cessna 177 Cardinal (with Lycoming O-360)

Crucial Note: This is a Textron Aviation standard part number. Its applicability for a specific aircraft model, serial number, and location must be verified using the current revision of the aircraft's Illustrated Parts Catalog (IPC).

Fits in

Applications

This hose is designed for low-pressure fluid and vapor transfer within the engine compartment. The primary, specified application is:

• Rocker Arm Cover Oil Drain Line Connector: Connects the oil drain fitting on the valve rocker cover to the oil return manifold or tubing.

It may also be specified for other applications, such as crankcase breather lines or low-pressure vent lines, as detailed in the IPC.

Why Choose STD-2180?

Choosing the genuine Textron Aviation STD-2180 is a critical decision for safety and reliability. An engine compartment is a no-compromise zone. The risk of using an unapproved hose from an automotive or industrial source is an engine fire. Such hoses lack the certified resistance to aviation-specific fluids and will quickly become brittle, cracked, or swollen, leading to leaks. The STD-2180 is guaranteed to be made from the correct, certified materials as specified by the airframe manufacturer, providing a leak-free seal and ensuring the continued airworthiness of the aircraft.

The exceptional performance of the STD-2180 hose in a petroleum-rich environment is rooted in the polymer chemistry of its inner tube, typically made of Acrylonitrile Butadiene Rubber (NBR), or Nitrile. The resistance of NBR to non-polar solvents like oil and fuel is determined by its acrylonitrile (ACN) content. The polar nitrile groups (-C≡N) along the polymer chain are not chemically attracted to the non-polar hydrocarbon molecules of the fluid. This chemical dissimilarity prevents the fluid from penetrating and swelling the rubber's polymer matrix, which would otherwise cause a catastrophic loss of material strength and elasticity. This contrasts with a non-resistant elastomer like EPDM, whose non-polar structure would readily absorb the hydrocarbon fluid, leading to rapid failure. The complete MIL-DTL-6000 hose is an engineered system where the NBR inner tube provides fluid containment, the braided fiber reinforcement provides kink and pressure resistance, and the outer cover provides thermal and abrasion protection, creating a component that is fully optimized for the hostile environment of an engine nacelle.

Note: This hose is a flight-critical component due to its location in the fire zone of the engine compartment. All flexible fluid lines have a finite service life and are subject to degradation from heat, ozone, and fluid exposure. Inspect this hose at every pre-flight and scheduled inspection for any signs of cracking, hardening, swelling, or sponginess. Installation must be performed by a certified A&P mechanic using the correct type of spring or screw-type hose clamps as specified in the maintenance manual, ensuring clamps are tight but not overtightened.

Documentation

The definitive application and installation eligibility for this component must be confirmed using the Illustrated Parts Catalog (IPC) and maintenance manuals for the specific aircraft model and serial number.