Why this exists
Most lines of insurance pooled their loss experience long ago. Auto, life and workers’ compensation each built shared records of what happens and how often. Business aviation never did. Turbine submissions are still priced largely on the application, the underwriter’s memory, and a fleet guess nobody can audit. Carriers said as much to one state regulator in 2022: insurers writing about 70 percent of that state’s aircraft market reported there were too few risks for the law of large numbers and that they rely largely on underwriter judgment.
The Monthly Record is a small part of the fix. Each month: the rate, what entered the record, and one piece of analysis.
The number
The exposure counts every year each aircraft spent on the US register, across the whole fleet.
This figure was restated on 28 Sep 2026 on a cleaner event and exposure base. Earlier drafts of this issue carried a higher number. The restatement log shows both, with the reason. This publication corrects itself in the open.
This month’s analysis: the book is priced on a fleet that no longer exists
Split the record at 2017 and the owner-flown turbine fleet looks like two different populations. Fatal accident rates for the three largest single-pilot families fell by between half and four fifths from 2008 to 2016 to 2017 to 2025. A book priced on decade-old single-pilot experience is pricing a fleet that has changed. Read the note.
One more figure worth keeping
Among turbine accidents with occupants aboard, 81 percent kill no one and 15 percent kill everyone. There is almost no such thing as a moderately fatal turbine accident. Frequency says how often the call comes; what happened aboard decides whether the file is a hull claim or a catastrophe.
Method, in two lines
Scope: fixed-wing turbine airplanes in business use; airline and agricultural operations excluded. Exposure: aircraft-years on the US register. Full methodology.