Engine Fuel & Control - Power Turbine Governor Bearing Assembly - Removal / Replacement
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators and maintenance personnel must remove the PTG bearing assembly P/N 2544198 from affected Rolls-Royce model 250-C turboshaft engines and replace it with an eligible bearing assembly by August 16, 2018. Installation of the removed bearing assembly is prohibited. Compliance should follow the guidance provided in Rolls-Royce Corporation Commercial Engine Bulletin 1402, Revision 2.
Summary
The Federal Aviation Administration's Airworthiness Directive 2018-13-01 addresses certain Rolls-Royce Corporation model 250-C turboshaft engines installed on single-engine helicopters. This directive mandates the removal and replacement of the power turbine governor (PTG) bearing assembly, part number 2544198, due to reports of engine power loss including a fatal accident. The directive aims to mitigate an unsafe condition by requiring installation of a bearing assembly eligible for installation.
What changed
This new airworthiness directive introduces a mandatory removal of the PTG bearing assembly P/N 2544198 and prohibits its reinstallation. It requires replacement with a bearing assembly eligible for installation but does not specify a particular replacement part number to allow for future updates. The directive clarifies applicability to engines with the affected bearing assembly installed and adds an installation prohibition for the faulty part number.
Why it matters
This directive is critical for aviation professionals as it addresses a known safety risk that has resulted in engine power loss and a fatal accident. Operators and maintenance organizations must ensure compliance to prevent similar incidents and maintain airworthiness. The directive also impacts maintenance tracking and parts inventory by prohibiting the use of the faulty bearing assembly and requiring replacement with approved parts.
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