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NTSB Finds Engine Part Installed Backwards on American Airlines Boeing 737 That Caught Fire

NTSB Identifies Backwards-Installed Engine Part as Cause of Fire on American Airlines Boeing 737
Incident Overview and Immediate Response
The National Transportation Safety Board (NTSB) has released preliminary findings regarding the March 2025 fire aboard an American Airlines Boeing 737-800, attributing the incident to a critical engine component installed incorrectly. On March 13, 2025, American Airlines Flight 1006 departed Colorado Springs Airport en route to Dallas Fort Worth International Airport. Shortly after takeoff, the flight crew detected unusual engine vibrations but continued the flight while diverting to Denver International Airport as a precaution. The aircraft reached an altitude of 16,000 feet before safely landing at Denver without further complications.
Following engine shutdown at the gate, passengers and crew reported smoke filling the cabin, with the right engine observed to be engulfed in flames. Flight attendants promptly initiated an emergency evacuation, and ramp personnel extinguished the fire within a minute, prior to the arrival of airport firefighting teams. Of the 178 individuals onboard, including 172 passengers and six crew members, twelve sustained minor injuries.
Technical Findings and Investigation Details
The NTSB’s investigation revealed extensive damage concentrated on the right engine nacelle, characterized by soot and burn marks consistent with fire exposure. Surveillance footage from Denver airport operations captured a fluid leak beneath the right engine as the aircraft taxied to the gate. Subsequent inspection identified that a fuel fitting associated with the variable stator vane (VSV) actuator had been improperly installed and lockwired in the reverse direction. This incorrect installation permitted fuel leakage, which ultimately ignited after engine shutdown.
The NTSB confirmed that the backwards installation of this engine part was a direct contributor to the fire, highlighting a critical maintenance error. The affected aircraft, a 13.3-year-old Boeing 737-800 powered by two CFM56-7B turbofan engines and configured to seat 172 passengers across three classes, was returned to service on June 1, 2025, following repairs and comprehensive safety inspections.
Industry Implications and Future Outlook
The identification of a backwards-installed engine component has raised significant concerns regarding maintenance protocols and quality control within the airline industry. This incident is anticipated to prompt airlines and maintenance providers to rigorously review their procedures and supplier oversight to mitigate the risk of similar failures. Boeing may face increased regulatory scrutiny as a result, with potential impacts on its market position and stock performance amid renewed safety concerns.
Competitors within the aviation sector may leverage this event to emphasize their own safety records, while the NTSB’s ongoing investigation could lead to broader recommendations aimed at enhancing maintenance standards industry-wide. The final NTSB report is expected to offer further guidance to prevent recurrence and improve overall aviation safety.

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