EASA SIB 2025-06R1
Potential Risk Management Issue after Engine Load Reduction Device Activation
Summary
EASA Safety Information Bulletin 2025-06R1 is an updated advisory addressing potential risk management issues following activation of the Load Reduction Device (LRD) on CFM International LEAP engines powering Boeing 737 Max and Airbus A320 NEO family aircraft. The bulletin highlights incidents where LRD activation after bird strikes caused oil leakage into the Environmental Control System (ECS), resulting in smoke in the cabin and flight deck. It provides information on the nature of the hazard, affected aircraft systems, and interim mitigation measures.
What Changed
This revision updates the original EASA SIB 2025-06 by including new safety information from recent incidents, ongoing investigations, and updated mitigation procedures. It introduces additional operational recommendations such as the pack-off take-off procedure and highlights forthcoming engine software changes to automatically isolate bleed air in case of LRD activation. The bulletin clarifies differences in ECS architecture between Boeing 737 Max and Airbus A320 NEO aircraft and reinforces pilot procedural guidance.
Why It Matters
This bulletin is important for aviation professionals because it informs operators and flight crews about a rare but serious safety issue involving smoke contamination following LRD activation on LEAP-powered aircraft. Understanding the risks and proper response procedures is critical to maintaining flight safety and managing in-flight emergencies effectively. Maintenance and compliance teams must be aware of interim measures and upcoming software fixes to ensure continued airworthiness and operational readiness.
What To Do
Operators should identify which aircraft in their fleet are equipped with CFM LEAP engines featuring the LRD and ensure flight crews are trained to recognize and respond to LRD activation events, including smoke in the cockpit or cabin. Flight crew recurrent training should emphasize relevant procedures and memory items to isolate the affected engine promptly. Operators should verify and implement the pack-off take-off procedure as per aircraft manufacturer guidance. There are no mandatory compliance deadlines as this bulletin provides information and recommendations only.
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