Method for inspecting a rotor blade unit

A method for inspecting a rotor blade unit of a gas turbine, the rotor blade unit including a radially outwardly disposed outer shroud connected by a material-to-material bond to a radially inwardly adjoining rotor blade, the rotor blade having an airfoil including a pressure side and a suction side, as well as an axial leading edge and an axial trailing edge interconnecting the pressure side and the suction side, the method comprising the following steps:

• providing a rotor blade unit;
• selecting a side to be processed, the side being an axially forward or axially aft side determined to have a greater distance from the adjacent axial leading edge or axial trailing edge of the rotor blade;
• processing the outer shroud at the selected side, a contact surface being formed by processing the selected side;
• providing the rotor blade unit having the contact surface in a measuring device;
• and
• determining a torsion or twist of the rotor blade unit about an axis using the measuring device;
• wherein a non-selected side of the outer shroud remains unprocessed.