Part 6/9:

An investigation by the Dutch Safety Board revealed deep flaws not only in the aircraft's systems but also in pilot decision-making. Boeing had known about the potential issues arising from a faulty radio altimeter as far back as 2004, with several cases prior to the crash illustrating that erroneous readings could lead to a mistaken engagement of the flare mode. However, a software fix was only issued for aircraft produced after 2006, leaving the involved aircraft exposed to the unresolved issue.