Detection Requires DiligenceThe insidious nature of fatigue cracking means that some damage mechanisms will only reveal themselves through comprehensive rotor life analysis. Not All Rotors Are Created EqualWhile 7FA rotors are generally considered interchangeable, operators should understand that variations exist across the fleet. The 7FA rotor operates at cooler conditions than the H machine; hence, utilizing Inco 718 for the 7F rotor is not necessary. Certain choices made during rotor life extension can inadvertently limit an owner to a single solution provider. The 7EA fleet provides some insight into what may lie ahead for 7FA operators.