https://www.ntsb.gov/news/press-releases/Pages/NR20250618.aspx
WASHINGTON (June 18, 2025) — The National Transportation Safety Board
issued an urgent safety recommendation Wednesday to address the possibility
of smoke entering the cockpit or cabin of airplanes equipped with
CFM International LEAP-1B engines and issued additional recommendations
to evaluate the potential for the same issue with LEAP-1A and -1C engines.
CFM LEAP engines are used on variants of Airbus A320neo
and Boeing 737 Max narrow-body passenger jets.
However, Airbus’s use of the LEAP engines does not have such problems
Due to their modern design & engineering unlike Boeing’s 51 year old
vintage aircraft.
The NTSB found that the engine load reduction device, or LRD, a safety feature designed to reduce the severity of vibrations transmitted from a damaged engine
to the airframe, can result in damage to the engine oil system. Such a condition
can allow smoke from hot oil to enter the ventilation system and ultimately the cockpit or passenger cabin.