The en-route requirement under JAR Ops 3 is for Class 1 and 2 operations to ensure a 50 ft/min roc ability at MSA with OEI continuous rating, Vy and L/G up.
This was also a CAA requirement for Group A and Group A (restricted) operations, except they added a safety factor of 100 ft/min, specifying 50 ft/min net roc and 150 ft/min gross roc. The JAA do not distinguish between net and gross.