50-389133-15 - Textron Aviation OEM Engine Mount Vibration Isolator

50-389133-15 – Textron Aviation OEM Engine Mount Vibration Isolator

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Overview

The Textron Aviation 50-389133-15 is a genuine OEM, flight-critical engine mount vibration isolator for a wide range of Beechcraft Baron and Travel Air twin-engine aircraft. Colloquially known as a "Lord Mount," this is a highly engineered component that serves two equally vital functions: it is the primary structural link that supports the full weight and thrust of the Continental engine, and it is a sophisticated damping device that isolates the airframe from the engine's inherent vibrations. A failure of an engine mount would be a catastrophic structural event, making the integrity of this component absolutely paramount to flight safety.

This isolator is a composite assembly, featuring a high-strength steel core and housing with a specially formulated, high-performance elastomeric element permanently bonded between them. The elastomer is engineered to absorb and dissipate the vibrational energy of the engine, preventing it from being transmitted to the engine nacelle and the rest of the airframe. Critically, the mount features an interlocking, fail-safe metal design, which ensures that even in the unlikely event of an elastomer failure, the engine will remain securely attached to the aircraft.

Key Features

• Genuine Textron Aviation OEM Part: The original, factory-specified engine mount, guaranteeing perfect fit, correct durometer (stiffness), and conformity to the aircraft's type certificate.

• Flight-Critical Structural Component: Serves as a primary load-bearing structure, supporting the engine's static weight and all dynamic flight loads (thrust, torque, and G-forces).

• Advanced Elastomeric Core: Utilizes a proprietary, high-performance elastomer that is precisely formulated to provide the optimal vibration damping characteristics for Continental engines, and is resistant to heat, oil, and ozone.

• Fail-Safe Interlocking Design: Features a metal-to-metal interlocking geometry that prevents engine separation even if the elastomeric element is compromised, a critical life-saving feature.

• High-Strength Bonded Construction: The elastomer is chemically bonded to the metal components under immense pressure and heat, creating a single, integrated unit that is far stronger than a simple mechanical assembly.

• Corrosion-Resistant Finish: All metal components are treated with a durable coating to protect against corrosion in the harsh engine compartment environment.

Technical Specifications

• Part Number: 50-389133-15

• Component Type: Engine Mount Vibration Isolator

• OEM Manufacturer: Textron Aviation (Beechcraft)

• Material: High-Strength Steel and proprietary, high-performance Elastomer.

Aircraft Compatibility

This engine mount isolator is the specified OEM part for numerous Beechcraft twin-engine piston aircraft, including but not limited to:

• Beechcraft Baron: 55, A55, B55, C55, D55, E55, 58, 58P, 58TC

• Beechcraft Travel Air: 95, B95, D95

• Engine Applications: Primarily for aircraft equipped with Continental IO-470, IO-520, and IO-550 series engines.

Note: This is a flight-critical component. The aircraft's specific Illustrated Parts Catalog (IPC) for a given serial number is the final and absolute authority for determining part applicability.

Applications

• Engine Mounting: Provides the structural attachment points between the engine and the engine mount truss.

• Vibration Isolation: Its primary function is to absorb and damp engine vibrations, protecting the airframe, instruments, and occupants from fatigue and discomfort.

Why Choose 50-389133-15?

There is no substitute for a certified engine mount. A failed mount can lead to engine separation from the aircraft. The Textron Aviation 50-389133-15 is the only part guaranteed to be manufactured with the correctly formulated elastomer, with a durometer (stiffness) precisely tuned to the vibration frequency of the Continental engines used on the Baron and Travel Air. Using a non-certified part, or continuing to fly on old, hardened, or cracked mounts, is an extreme safety risk. A worn-out mount will transmit damaging vibrations to the firewall, engine instruments, and propeller, and a failed mount is catastrophic. For the safety of your aircraft, the genuine OEM part is the only airworthy choice.

The engineering principle that allows the 50-389133-15 mount to be so effective is viscoelastic damping. The elastomeric core is a viscoelastic material, meaning it exhibits both viscous (fluid-like, energy-dissipating) and elastic (solid-like, energy-storing) properties. When subjected to the engine's vibration (a rapid, cyclic shear strain), the elastomer deforms. Due to the polymer chains' internal friction, a significant portion of the input vibrational energy is converted into low-level heat and dissipated within the material itself, a phenomenon known as hysteresis. This energy is thus "absorbed" by the mount rather than being transmitted to the airframe. The "fail-safe" design is equally critical; it ensures that if the elastomer is ever completely compromised, interlocking metal tabs will make contact, containing the engine's movement and preventing it from detaching, albeit with a massive and immediately obvious increase in vibration felt in the cockpit.

Note: The 50-389133-15 is a flight-critical component and is replaced on condition or at specified time intervals. Installation must be performed by a certified A&P/IA mechanic. Engine mounts should always be replaced as a complete set to ensure uniform support and damping. The mounts must be inspected at every engine inspection for signs of elastomer cracking, hardening, bulging, or delamination from the metal components. Any fluid contamination (oil or fuel) will rapidly degrade the elastomer and necessitates immediate replacement.

Documentation

No public-facing OEM specification sheet was located for this proprietary part number. All authoritative technical data, installation procedures, and inspection criteria are contained within the official Textron Aviation Maintenance Manual and Illustrated Parts Catalog (IPC) for the applicable aircraft models.