A military vehicle aboard an overloaded plane in Afghanistan broke free and struck critical operating systems, probably leading to the 2013 crash that killed all seven crew members, US safety officials said on Tuesday.
The National Transportation Safety Board said an improperly secured mine-resistant, ambush-protected vehicle, known as an MRAP, went through the bulkhead and disabled two hydraulic systems, making the aircraft uncontrollable.
The Dubai-bound Boeing 747-400 plane crashed just after takeoff from Bagram airbase on 29 April 2013, killing six crew members. It was operated by National Air Cargo Group Inc and carried 207 tonnes of cargo, including five MRAPs, weighing between 12 and 18 tonnes each.
https://en.wikipedia.org/wiki/National_Airlines_Flight_102
https://www.theguardian.com/world/2015/jul/15/crash-of-boeing-747-in-afghanistan-caused-by-shifting-cargo
