CUTTING THROUGH THE MYTHS TO GET TO THE FACTS OF FLIGHT
In my March Aftermath column on the 2012 crash of a Pilatus PC-12 in Florida, I faulted the National Transportation Safety Board for mixing up indicated and true airspeeds. Actually, it was I who misread the report. I am indebted to reader Timothy Burtch, an accident investigator with the NTSB, for pointing out that the maximum speed of 338 knots that the airplane reached in a spiral dive before it broke apart was, in fact, an indicated airspeed, not a true one, and that the airplane did, therefore, exceed its maneuvering speed by 175 knots as the report stated.
The Pilatus, with a family of six aboard, was climbing through FL 250 in IMC. It was at 109 kias,…
