EASA AD US-2020-04-01
Engine - LP10 Oil Supply Tube & Fuel Oil Cooler - Inspection
Summary
FAA Airworthiness Directive 2020-04-01 is a final rule addressing Pratt & Whitney PW1519G, PW1521G, PW1521GA, PW1524G, PW1525G, PW1521G-3, PW1524G-3, PW1525G-3, PW1919G, PW1921G, PW1922G, PW1923G, and PW1923G-A model turbofan engines. It mandates inspections and potential replacement of the LP10 oil supply tube and the fuel oil cooler (FOC) due to reports of in-flight shutdowns caused by oil leaks at their connection. This directive aims to prevent engine fires and damage to aircraft.
What Changed
This new airworthiness directive introduces requirements for initial and repetitive gap inspections between the LP10 oil supply tube and the FOC using a 0.001 inch feeler gauge. If a gap is detected, the affected parts must be replaced before further flight. Additionally, the directive requires removal and replacement of these parts at the next engine shop visit after the effective date.
Why It Matters
This directive is critical for aviation professionals to prevent unsafe conditions that could lead to engine failure and potential in-flight shutdowns. Operators and maintenance teams must ensure compliance to avoid engine fires and aircraft damage, thereby maintaining safety and regulatory adherence. It also impacts maintenance planning and parts inventory management due to the inspection and replacement requirements.
What To Do
Operators must perform an initial gap inspection within 300 engine cycles from March 27, 2020, and repeat inspections every 850 engine cycles if no gap is found. If any gap is detected, the LP10 oil supply tube and FOC must be replaced before further flight. Furthermore, these parts must be removed and replaced at the next engine shop visit following the directive's effective date.
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