EASA AD 2019-0029
Engine — Propeller Reduction Gear Excentric Axle Bearings — Replacement
Summary
EASA Airworthiness Directive 2019-0029 is an airworthiness directive addressing Solo Kleinmotoren GmbH Solo 2350 B, 2350 BS, 2350 C, and 2350 D engines installed on powered sailplanes from manufacturers such as DG Flugzeugbau, Alexander Schleicher Segelflugzeugbau, Schempp-Hirth Flugzeugbau, and Technoflug Leichtflugzeugbau. The directive mandates replacement of the propeller reduction gear eccentric axle bearings and related parts to prevent failure. It applies to all serial numbers of the affected engines.
What Changed
This new directive introduces a requirement to replace the affected hex-nut securing the pulley bearing with a redesigned flange-nut and imposes a 15-year life limit on the reduction gear ball bearings. It also prohibits installation of affected parts after the effective date and requires replacement of bearings before they reach the life limit or within 12 months of the directive's effective date.
Why It Matters
This directive is critical for aviation professionals as it addresses a safety risk where bearing failure could lead to propeller separation, potentially causing loss of aircraft control and damage. Operators and maintenance organizations must ensure compliance to maintain airworthiness and avoid unsafe conditions. The life limit and part replacement requirements affect maintenance planning and parts inventory management.
What To Do
Operators of Solo 2350 B, BS, C, and D engines must replace the affected hex-nut with the serviceable flange-nut within 12 months of 22 February 2019 if installed. Additionally, all affected ball bearings must be replaced before accumulating 15 years of service or within 12 months after the effective date, whichever is later. Installation of affected parts is prohibited from the effective date onward unless replaced with serviceable parts.
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