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WASHINGTON: The National Transportation Safety Board issued an urgent safety recommendation Wednesday to address the possibility of smoke entering the cockpit or cabin of Boeing 737 MAX airplanes equipped with CFM International LEAP-1B engines.
The NTSB also recommended evaluating the potential for the same issue with LEAP-1A and LEAP-1C engines, which are used on some Airbus A320neo variants and COMAC’s Chinese-made C919 jets.
The recommendation comes after two incidents involving Southwest Airlines Boeing 737 MAX jets that experienced bird strikes in 2023. The NTSB wants the Federal Aviation Administration to ensure that operators inform flight crews of airplanes equipped with the affected engines.
Southwest said it is reviewing the recommendations and that it has mitigation procedures currently in place. Southwest notified its flight crews about the effects of certain bird strikes following two events that occurred in 2023, reiterating the importance of following established safety procedures.
CFM, the world’s largest engine maker by units sold, is co-owned by GE Aerospace and Safran.
The NTSB said it was “critical to ensure that pilots who fly airplanes equipped with CFM International LEAP-1B engines are fully aware of the potential for smoke in the cockpit if the load reduction device is activated during a critical phase of flight (takeoff or landing).”
The FAA and Boeing both said they agreed with the NTSB recommendations, and the planemaker alerted operators that smoke could enter the flight deck following the activation of the Load Reduction Device (LRD) in the engines, as a result of a bird strike.
“We advised operators to evaluate their procedures and crew training to ensure they address this potential issue,” the FAA said. “When the engine manufacturer develops a permanent mitigation, we will require operators to implement it within an appropriate timeframe.”
Boeing said that CFM and Boeing “have been working on a software design update.” The NTSB wants the update to be required on all 737 MAX planes once completed.
GE, Airbus and COMAC did not immediately respond to requests for comment
The NTSB asked the European Union Aviation Safety Agency and the Civil Aviation Administration of China to determine if other variants of the CFM LEAP engine are also susceptible to smoke in the cabin or cockpit when an LRD activates. EASA did not immediately respond to requests for comment.
In November, the FAA said it would not require immediate action after convening a review board to consider concerns about Boeing 737 MAX engines after two bird strike incidents involving the CFM LEAP-1B.
The FAA had been considering recommendations for new takeoff procedures to close the airflow to one or both engines to address the potential impact of a bird strike and prevent smoke from entering the cockpit.
In 2024, the NTSB opened an investigation into the Southwest left engine bird strike and subsequent smoke in cockpit event that occurred near New Orleans in December 2023.
The other incident occurred in a Southwest March 2023 flight that had departed Havana and in which a bird strike led to smoke filling the passenger cabin.
In February 2024, Boeing published a bulletin to inform flight crews of potential flight deck and cabin effects associated with severe engine damage.

ST PETERSBURG, Russia: Russian President Vladimir Putin said on Thursday that Iranian society was consolidating around the Islamic Republic’s leadership when asked by Reuters if he agreed with Israeli statements about possible regime change in Tehran.
Putin was speaking as Trump kept the world guessing whether the US would join Israel’s bombardment of Iranian nuclear and missile sites and as residents of Iran’s capital streamed out of the city on the sixth day of the air assault.
Putin said all sides should look for ways to end hostilities in a way that ensured both Iran’s right to peaceful nuclear power and Israel’s right to the unconditional security of the Jewish state.
Asked about Israeli Prime Minister Benjamin Netanyahu’s remarks that regime change in Iran could be the result of Israel’s military attacks and US President Donald Trump’s demand for Iran’s unconditional surrender, Putin said that one should always look at whether or not the main aim was being achieved before starting something.
“We see that today in Iran, with all the complexity of the internal political processes taking place there...that there is a consolidation of society around the country’s political leadership,” Putin told senior news agency editors in the northern Russian city of St. Petersburg.
Putin said he had personally been in touch with Trump and with Netanyahu, and that he had conveyed Moscow’s ideas on resolving the conflict.
He said Iran’s underground uranium enrichment facilities were still intact.
“These underground factories, they exist, nothing has happened to them,” Putin said, adding that all sides should seek a resolution that ensured the interests of both Iran and Israel.
“It seems to me that it would be right for everyone to look for ways to end hostilities and find ways for all parties to this conflict to come to an agreement with each other,” Putin said. “In my opinion, in general, such a solution can be found.”
Russian Deputy Foreign Minister Sergei Ryabkov said on Wednesday
that Moscow was telling the United States not to strike Iran because it would radically destabilize the Middle East.
A spokeswoman for the Russian Foreign Ministry also warned that Israeli strikes on Iranian nuclar facilities risked triggering a nuclear catastrophe.