Engine — Non-Synchronous Vibration During Engine Operation — Monitoring
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Airbus A319, A320, and A321 aircraft equipped with LEAP-1A engines must evaluate NSV within 125 flight cycles from 6 May 2024 and repeat every 125 flight cycles if affected parts are installed. If NSV discrepancies are detected, affected parts must be replaced and turbine components inspected per the service bulletin instructions. Installation of affected parts is prohibited from the effective date, and replacement of affected parts must occur at the next piece-part exposure or before 9,900 flight cycles since new.
Summary
EASA Airworthiness Directive 2024-0093 addresses non-synchronous vibration (NSV) issues during operation of CFM International LEAP-1A engines installed on certain Airbus A319, A320, and A321 aircraft. The directive targets specific affected parts, notably bearing No. 3 spring finger housings with certain part numbers and serial numbers, to ensure ongoing engine safety and airworthiness. It mandates monitoring and corrective actions to prevent potential engine stalls and turbine failures.
What changed
This new Airworthiness Directive introduces mandatory NSV monitoring for LEAP-1A engines with affected parts installed and prohibits the installation of these affected parts. It requires operators to perform periodic NSV evaluations within 125 flight cycles and to replace affected parts by the next piece-part exposure or before 9,900 flight cycles since new. Corrective actions include part replacement and inspections of turbine components if discrepancies are found.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk that could lead to engine stalls, turbine failures, and potential release of high-energy debris, which may compromise aircraft control. Operators and maintenance organizations must comply to maintain engine reliability and airworthiness, avoiding unscheduled downtime and ensuring regulatory compliance. Monitoring and timely corrective actions help prevent costly engine damage and enhance flight safety.
More for CFM International LEAP-1A
All 21- EASA SIB 2025-06R1Potential Risk Management Issue after Engine Load Reduction Device ActivationOct 1, 2026
- EASA AD 2025-0171R2Engine – High Pressure Turbine Rotor Stage 1 Blade – InspectionJul 3, 2026
- EASA PAD 26-006Engine — Full Authority Digital Electronic Control Software — ReplacementJan 16, 2026
- EASA AD 2025-0246Engine — Non-Synchronous Vibration During Engine Operation — Monitoring / ReplacementOct 30, 2025
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