How can a single burnt-out light bulb bring down one of the most advanced aircraft ever built? A state-of-the-art Lockheed L-1011 TriStar jetliner plunges into the Florida Everglades when its experienced crew became fixated on a minor mechanical issue. 

Sources:

• Mayday: Air Disaster - Season 5, Episode 9, titled "Fatal Distraction"
• "What CAUSED the Everglades DISASTER?" by Mentour Pilot
• Wikipedia page on Eastern Air Lines Flight 401

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Credits:

Final Boarding Call is hosted by Alice Stern and Zach Stemas, researched and written by Alice Stern, produced and edited by Alice Stern and Zach Stemas.