Lufthansa Flight 540 IncidentLufthansa Flight 540 was a serious aviation accident that occurred on November 20, 1974, involving Lufthansa Flight 540 operated by the German airline Lufthansa. Below are the key details:Basic Information:Aircraft: Boeing 747-130 (registration D-ABYB)Route: From Frankfurt, Germany to Nairobi, Kenya, with a stopover in Addis Ababa, EthiopiaAccident Location: Jomo Kenyatta International Airport, Nairobi, KenyaPeople on Board: 157 (140 passengers, 17 crew members)Fatalities: 59Survivors: 98Accident Summary:The aircraft took off from Nairobi in good weather conditions.Just seconds after takeoff, it failed to gain sufficient altitude. The tail struck the ground, and the aircraft crashed and caught fire.Most fatalities occurred due to the fire, as many passengers were unable to escape in time.Cause:Investigations revealed:The primary cause was the leading-edge slats not being properly deployed because the flight crew failed to activate the bleed air switch necessary for powering the slat system.The cockpit design and warning systems did not clearly alert the crew that the slats were not extended.Significance:This was the first accident involving a Boeing 747 in commercial service.As a result, Lufthansa and other airlines revised their pre-flight checklists and improved cockpit warning systems.