Despite some theories that the plane may have been the victim of sabotage , poor maintenance , or in-flight fire , investigators could not find Know enough evidence to support Supporting any definite conclusion .

To maximize the working space within the cargo hold , the cargo doors opened Openness outwards , leading to Causation the possibility of them being forced Motion open Openness at altitude under normal in-flight pressure .

On 2 June 1983 , the McDonnell Douglas DC-9-32 operating Being_in_operation the service developed Coming_to_be an in-flight fire behind the lavatory that spread Dispersal between the outer skin and the inner decor panels , filling Filling the plane with toxic smoke .

The aircraft , a Martin 4-0-4 with a total of 15,970 hours in-flight , attempted Hold to take-off Self_motion on runway 28 into a heavy thunderstorm .

The Department ordered Request that the rudders of all Super Electras be modified Change so as to eliminate Removing the possibility that flutter Motion would cause Causation an in-flight break-up Destroying .