
Incorrect extension of the lift dump spoilers on a Beechcraft Premier I led to a sudden loss of lift and control that caused the business jet to crash on approach to Kuala Lumpur’s Sultan Abdul Aziz Shah Airport. That's according to a just-released final report into the Aug. 17, 2023, fatal accident by Malaysia’s Air Accident Investigation Bureau (AAIB). Both pilots and six passengers on board were killed, as well as the drivers of a car and a motorbike.
The report states that the second-in-command (SIC) pilot, who was not type-rated in the Premier I, had been assigned to run through the "Before Landing" checklist for operating some of the controls while the pilot-in-command (PIC) had control of the aircraft. On the cockpit voice recording, the SIC pilot was heard saying “lift dump unlocked” as the third item on the checklist, with the PIC acknowledging this incorrect instruction.