On DC-8s , spoilers are used after landing only ( i.e. ground spoiler ) . Few methods can be used to reduce speed in flight ( e.g. before landing ) , such as deploying the thrust reverser of inner engines on both port and starboard side . Other accidents attributed to accidental deployment of ground spoiler in flight have also occurred . As a result , modifications were done to make ground spoilers unable to deploy in flight altogether
Other accidents
Air Canada Flight 621
Japan Airlines Flight 446