PWC32080 - Barry Mounts 5906-2SA5 Turbine Engine Vibration Isolator

The 5906-2SA5 engine mount comes with a standard manufacturer's warranty, which covers 12 months or 500 flight hours, whichever comes first.

FAA-PMA means the part is approved by the FAA under Parts Manufacturer Approval and meets safety, performance, and quality standards for replacement parts. This approval assures operators that the 5906-2SA5 is an acceptable substitute for the original engine mount.

The number of isolators required per engine depends on the aircraft model. For example, Air Tractor AT-400/402 models may use three mounts, whereas larger or twin-PT6 installations might use four or more. Always refer to the aircraft’s maintenance manual or the Barry Mounts application chart to determine the correct number.

The 5906-2SA5 is designed to dampen high-frequency vibrations from the PT6 engine, reducing transmission of engine vibration into the airframe. This helps reduce pilot and passenger fatigue and cabin noise and also mitigates long-term wear on the firewall, mount supports, and airframe structure.

Signs include visible cracking or separation of the elastomer (rubber portion), excessive movement, clam-shell or abnormal deflections, increased cabin vibration or noise, or any scheduled maintenance required replacement intervals. When worn, the isolator loses its vibration isolation effectiveness.

Yes! Replacing mounts as a set ensures the Dynafocal alignment and vibration isolation characteristics remain balanced. If one isolator is new while others are worn, imbalanced motion can lead to atypical vibration, accelerated wear on mounts or structure, and possibly early failure of neighboring components.

The isolator is part of a Dynafocal mounting system, meaning the angle and direction of each mount are tuned to converge at the engine’s center of gravity. Proper orientation ensures that vibrational modes are isolated efficiently. Misalignment during installation can reduce effectiveness and cause undue stress.

Engine mounts like the 5906-2SA5 should be visually inspected at regular intervals (often with engine overhauls or scheduled hot section inspections) for signs of wear, rubber degradation, and bonding failures. Check the torque of mount bolts and alignment, and ensure no fluid exposure has compromised the elastomer.