A number of theories suggest that the disappearance may have been the result of a fire in the cockpit , cargo compartment , landing gear , or another part of the plane . In an earlier incident involving a Boeing 777 , on 29 July 2011 , EgyptAir Flight 667 suffered an intense oxygen-fed cockpit fire while still on the ground which destroyed the flight controls , the instruments and burnt a hole through the hull of the aircraft . Despite the arrival of firefighters within three minutes , the fire took 90 minutes to extinguish . Malaysia Air 's maintenance records for the 777 aircraft are required to include information on whether the FAA-mandated fix to the wiring near the co-pilot 's oxygen hose and replacement of the oxygen hose with one with no metallic components was performed
EgyptAir Flight 667
EgyptAir Flight 667
Malaysia Airlines Flight 370 unofficial disappearance theories