The U.S. Department of Transportation Office of Inspector General (DOT OIG) has raised serious concerns about the FAA’s handling of smoke intrusion risks from LEAP-1B engines on Boeing 737 MAX aircraft. A recent audit criticizes the agency’s decision to prioritize long-term software fixes over immediate operational changes, potentially leaving fleets vulnerable.
The issues stem from two 2023 bird strike incidents where engine fan blade damage activated the Load Reduction Device (LRD), releasing oil mist into the environmental control system. This caused smoke in the cockpit and cabin, reducing visibility, increasing crew workload, and posing exposure risks during critical flight phases.
Despite following procedures, the FAA faced internal disagreements: its Accident Investigation office pushed for quick takeoff procedure adjustments, while Aircraft Certification favored software updates. The agency chose the latter, delaying mitigation across the global 737 MAX fleet.
The audit highlights unresolved gaps, including uncertain software rollout timelines, inadequate pilot notifications on LRD hazards, and deficient training for oxygen use in smoke events. Boeing 737 MAX simulators fail to replicate LRD smoke realistically, impairing preparation.
A November 2024 Certification Action Review Board recommended an Airworthiness Directive for software updates once available. GE Aerospace and Boeing are developing the fix, but the report urges better operator communication and training enhancements to address operational safety risks.