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FAA considers Boeing 737 MAX engine redesign after smoke incidents

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FAA considers Boeing 737 MAX engine redesign after smoke incidents
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Simple Flying | Simple Flying

A team of accident investigators at the Federal Aviation Administration (FAA) has recommended changes to the CFM International LEAP-1B engines used exclusively by Boeing 737 MAX aircraft. The proposed design change addresses a vulnerability within the engine, unrelated to the aircraft itself. The FAA is still considering its final decision on this matter.

The issue involves smoke entering the aircraft's interior due to oil being ingested into the air conditioning system. This occurs when a load reduction device (LRD) activates, sending fumes into both cockpit and cabin areas. An internal FAA memo from October 28th, reported by The Seattle Times, outlines six recommendations to mitigate "the potentially catastrophic risk" posed by these emissions.

One recommendation is for FAA Administrator Mike Whitaker to "require a design change which detects the immediate impulse of a bird strike” and automatically shuts off airflow from the affected engine into the aircraft’s interior promptly.

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To address these concerns in the interim, an emergency airworthiness directive is suggested. This directive would require all MAX pilots to adjust their takeoff procedures until engine design changes are implemented. Two options have been proposed: closing airflow from just one engine or from both engines during takeoff after a bird strike incident.

Dennis Tajer of the Allied Pilots Association advocates for closing airflow from both engines as it prioritizes passenger safety: "We have to protect the passengers. They shouldn't be doused with lethal chemicals."

However, Jeff Guzzetti, an aviation safety consultant and former FAA accident investigator who oversaw production of the memo, suggests that corrections might not be necessary: "These two events certainly sound serious to me. However, there could be people inside the FAA — engine certification experts, engineers, test pilots — that would say this is not needed."

Boeing and CFM International have stated they are collaborating with the FAA on resolving this issue.

The investigation was prompted by incidents involving Southwest Airlines flights in March and December 2023 where Boeing 737 MAX 8 aircraft had to return after bird strikes resulted in smoke filling either cabin or cockpit areas.

The FAA plans further collaboration with Boeing, CFM International, and EASA on next steps regarding these incidents.

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