Shear points
On several big military aero engines that I have in my little collection, many ancillary items such as Gen and Hyd PTO's are all covered by the inclusions of engineered shear break points near to points of known stress, so that in the event of a major catastrophe in the actual remote equipment the shaft would have a cleanish break and not detract from engine performance.
Do any of the helicopters flying now either civvie or military have such things engineered into any of the many PTOs that run such things as T/R's and or main rotor, or even turbines when in twin config?
PeterR-B
Vfr