7351260-1 - Barry Controls Tube Bumper Engine Mount for DH6 Twin Otter Aircraft

7351260-1 – Barry Controls Tube Bumper Engine Mount for DHC-6 Twin Otter Aircraft

Available now on the Airparts.aero Marketplace.

Overview

The 7351260-1 is a genuine OEM, flight-critical engine mount, engineered by Barry Controls (now part of Hutchinson Aerospace & Industry) for the legendary De Havilland DHC-6 Twin Otter. This is not a simple bushing; it is a precision-engineered tube-form elastomeric vibration isolator. Its primary function is to support the Pratt & Whitney Canada PT6A turboprop engine and, most critically, to isolate the high-frequency vibrations of the turbine from the wing and airframe structure. Manufactured with a specially formulated elastomer bonded to a central metal tube, the 7351260-1 is essential for reducing airframe fatigue, lowering cabin noise, and ensuring the long-term reliability of the aircraft.

Key Features

• Tuned Vibration Isolation: The core of the mount is a proprietary elastomeric compound (a high-performance synthetic rubber) with a specific durometer (hardness) and damping characteristic. This compound is precisely "tuned" to absorb and dissipate the unique vibrational frequencies generated by the PT6A engine, preventing them from resonating with the airframe.
• Tube-Form Factor: Features a cylindrical or "tube" design, where the elastomer is bonded between a central metal tube (the "bumper" tube) and an outer housing or mounting flange. This design is highly effective at handling both radial (vertical and side) loads and torsional (twisting) loads.
• High-Strength Bonded Construction: The bond between the elastomer and the metal components is a critical chemical bond, created under high pressure and heat. This process ensures the bond is stronger than the elastomer itself, preventing delamination and failure under the extreme loads of flight and rough-field operations.
• Failsafe Design: The mount is engineered with a failsafe design. In the unlikely event of a complete failure of the elastomeric element, the interlocking metal components are designed to provide a positive mechanical stop, ensuring the engine remains securely attached to the airframe.
• Genuine OEM Component: As a genuine Barry Controls part specified by De Havilland/Viking Air, it guarantees the correct spring rate, material composition, and performance characteristics required by the aircraft's original Type Certificate.

Technical Specifications

• Part Number: 7351260-1
• Component Type: Tube-Form Elastomeric Engine Mount / Vibration Isolator
• OEM Manufacturer: Barry Controls / Hutchinson
• Elastomer Material: Proprietary, High-Damping Synthetic Rubber
• Metal Components: High-Strength Steel or Aluminum Alloy
• Primary Function: Engine support and multi-axis vibration isolation.
• Certification: FAA / TCCA Production Approval

Aircraft Compatibility

The 7351260-1 is the specified OEM engine mount for the highly successful and rugged De Havilland DHC-6 Twin Otter, an aircraft prized for its STOL performance and reliability.

• Primary Aircraft Model:
  • De Havilland Canada DHC-6 Twin Otter (all series, including those supported by Viking Air)

Applications

The 7351260-1 is a flight-critical component essential for engine installation and maintenance:

• Engine Mounting & Support: Serves as the primary structural link between the PT6A engine and the engine mount frame on the wing, supporting the full weight and operational loads of the powerplant.
• Vibration Isolation: Its primary function is to protect the airframe, instruments, and occupants from the damaging and fatiguing effects of engine vibration.
• Scheduled Maintenance Item: These mounts are life-limited components that must be inspected regularly for elastomer degradation (cracking, hardening, fluid contamination) and compression set. They are replaced as a complete set when they reach their service limits.

Why Choose 7351260-1?

Worn or failed engine mounts on a Twin Otter can lead to a dramatic increase in cabin noise and vibration, accelerated fatigue cracking in the wing and engine nacelle structure, and potential damage to engine accessories and plumbing. Using genuine Barry Controls 7351260-1 mounts is the only way to ensure the vibration isolation system performs as designed by the aircraft's engineers. The specific spring rate and damping characteristics of the elastomer are precisely tuned for the PT6A engine and the unique structural dynamics of the Twin Otter. For a component this critical to both comfort and structural integrity, there is no substitute for the proven performance and certified quality of a genuine OEM mount.

Order Your 7351260-1 Engine Mounts Now

Restore the smooth, quiet performance of your aircraft and protect your airframe from damaging vibration. Visit Airparts.aero to inquire about genuine Barry Controls 7351260-1 engine mounts today.

The 7351260-1 tube-form mount is engineered to provide controlled stiffness in multiple axes. The elastomeric element is bonded to the inner and outer metal members, and its shape is designed to be relatively "soft" in the directions of high-vibrational input, allowing it to flex and absorb energy. Simultaneously, it is designed to be "stiff" in the directions required to support the engine's static weight and react to propeller torque. This anisotropic (directionally dependent) stiffness is a key feature of advanced elastomeric isolators. The mount functions as a tuned spring-mass-damper system, where the engine is the "mass" and the 7351260-1 provides both the "spring" (stiffness) and the "damper" (energy dissipation through the elastomer's hysteresis) to isolate the airframe from the engine's resonant frequencies.

Note: Engine mounts are flight-critical components and should always be replaced as a complete set to ensure uniform performance and prevent uneven loading. Installation must be performed by a certified A&P or AME mechanic in strict accordance with the current DHC-6 Twin Otter maintenance manual. Pay close attention to the installation orientation and the specified torque values for all mounting hardware.