Airwolf’s TT Straps for Enstrom helicopters are solution to the Spindle AD

What began as an upgrade for operators who were not happy with their Lamiflex bearing’s life issues, rough ride and tracking and balancing problems, has resulted in a solution for Enstrom operators grounded by the Federal Aviation Administration’s (FAA’s) spindle airworthiness directive (AD).

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Airwolf believes there are about 550 piston Enstrom helicopters around the world, and is seeing a high demand for its STC modification for TT Straps. Airwolf Photo
Airwolf believes there are about 550 piston Enstrom helicopters around the world, and is seeing a high demand for its STC modification for TT Straps. Airwolf Photo

The recent FAA AD grounds all piston Enstrom helicopters that have more than 1,500 hours on the spindles until the spindles are replaced with new ones, and then requires 500-hour recurring inspections even for new spindles.

Helicopters converted to use TT Straps per Airwolf’s supplemental type certificate (STC) modification process are no longer affected by the AD.

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Airwolf believes that there are about 550 piston Enstrom helicopters registered around the world, and the company is seeing a high demand for the STC modification.

In anticipation of the high demand, Airwolf has invested heavily in building up its inventory of the parts required for the STC conversion and decreasing the turn time to keep Enstrom operators flying.

Airwolf is committed to shipping the completed Mod Kits back to customers in less than three weeks after receipt of the parts. The company’s goal is to keep Enstrom operators flying with as little disruption as possible.

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