Hydraulic Power — Hydraulic Pump Motor — Replacement
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must replace the affected hydraulic pump motor P/N 1259A with the improved motor P/N A-752511A00B within 200 operational hours or 600 landings after 18 August 2025, whichever applies. From the effective date, installation of the affected part is prohibited except for temporary removal and reinstallation during a single maintenance visit. Compliance must follow the instructions in General Atomics Service Bulletin SB-228-360.
Summary
EASA Airworthiness Directive 2025-0172 is an official safety directive addressing hydraulic pump motor replacement on General Atomics AeroTec Systems GmbH Dornier 228 aeroplanes, including models Dornier 228-100 through Dornier 228-212. The directive targets hydraulic pump motor Part Number 1259A, requiring replacement with an improved motor Part Number A-752511A00B to prevent overheating issues. This directive applies to all serial numbers of the affected Dornier 228 aircraft.
What changed
EASA Airworthiness Directive 2025-0172 introduces a mandatory replacement of the hydraulic pump motor P/N 1259A with an improved version P/N A-752511A00B that incorporates redesigned carbon brushes to prevent overheating. It prohibits reinstalling the affected part after removal and provides compliance instructions via General Atomics Service Bulletin SB-228-360. This is a new regulation addressing a specific unsafe condition without superseding any previous directives.
Why it matters
This directive is critical for aviation professionals because the affected hydraulic pump motor has been reported to suffer severe heat damage, which could lead to an uncontained fire. Operators and maintenance organizations must ensure compliance to maintain aircraft airworthiness and safety. Failure to comply could result in operational restrictions or increased risk of hydraulic system failure.
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