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Printed page xii. PDF page 15.
a FLCH SPD descent, and how the A/T automatic engagement feature operates. The PF's faulty mental model of the airplane's automation logic led to his inadvertent deactivation of automatic airspeed control. Both reduced design complexity and improved systems training caOpen final report at PDF page 15NTSB AAR-14/01: Asiana Airlines 214
Printed page 93. PDF page 111.
engagement feature operates. The complexity of autoflight systems can contribute to faulty mental models of automation logic. The systems installed on airplanes like the 777, for example, contain multiple subsystems. Each of these subsystems has various modes of operatOpen final report at PDF page 111NTSB AAR-14/01: Asiana Airlines 214
Printed page 97. PDF page 115.
when the pilot does not expect it to do so. The risk of this occurring is increased by faulty mental models of system logic and by system design characteristics that cause the same pilot inputs to have differing effects dependingOpen final report at PDF page 115NTSB AAR-14/01: Asiana Airlines 214
Printed page 96. PDF page 114.
Design As previously mentioned, reducing design complexity is another method by which faulty pilot mental models of complex autoflight systems can be alleviated. Human performance researchers have identified mode awareness as a significant and continuing area of concernOpen final report at PDF page 114NTSB AAR-14/01: Asiana Airlines 214