My interpretation of the use of the term “ un-lifed “ means that the measured stress from the flight loads survey flight test was under the “ endurance “ level, i.e. possessed infinite fatigue life when flown in that set of conditions/maneuvers/weights. There are some implications here. Perhaps I’m wrong re that verbage?
If memory serves, when Harry Jensen and his group at SA first arrived at the methods/test requirements etc associated with establishing the Safe Life concept in the helicopter business, there was a group at Bell doing similar work. That being true, I’d assume they’d be quite interested and able in following up on this situation.