EASA AD 2020-0204
Engine — Low Pressure Turbine — Inspection
Summary
EASA Airworthiness Directive 2020-0204 is an airworthiness directive addressing SaM146-1S17, SaM146-1S17C, SaM146-1S18, and SaM146-1S18C engines, commonly installed on Sukhoi RRJ-95B aircraft. The directive mandates inspection of the low pressure turbine (LPT) stage 3 disc assembly to detect incorrect assembly that could lead to disc separation and potential damage to the aircraft. It provides instructions for inspection and corrective actions if discrepancies are found.
What Changed
EASA Airworthiness Directive 2020-0204 introduces a new mandatory one-time inspection requirement for the LPT rotor assembly on specified SaM146 engine models. It requires operators to inspect the LPT stage 3 disc within 30 days of the effective date and to perform corrective actions if any assembly discrepancies are detected. This is a new directive and does not supersede any previous ADs.
Why It Matters
This directive is critical for aviation professionals because it addresses a potential unsafe condition that could lead to engine failure and release of high energy debris, posing safety risks to the aircraft and crew. Operators and maintenance organizations must ensure compliance to maintain airworthiness and prevent in-flight engine damage. Compliance teams need to track and document inspections and corrective actions to meet regulatory requirements.
What To Do
Operators of aircraft equipped with SaM146-1S17, -1S17C, -1S18, and -1S18C engines must inspect the LPT rotor assembly within 30 days of 7 October 2020, following PowerJet Service Bulletin 72-0241 instructions. If any discrepancies are found, the engine must be removed from service and repaired per PowerJet-approved instructions before further flight. Engines with prior photographic evidence confirming compliance are exempt from inspection.
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