Abstract: Disclosed is a borescope-based inspection method for inspecting a condition of an externally invisible component of a device, in which method a change in the microstructure of the component material is determined based on a physical property and evaluated in relation to at least one reference physical value that accounts for aging of the component. Also disclosed is a system having a computing unit and at least one probe for performing such an inspection method for selecting, with the aid of or, in particular, by a computer, a non-destructive testing method for measuring the physical property and for actually measuring the physical property, for performing a comparison between a measured value and the reference value and for performing an evaluation of a tolerance between the measured value and the reference value.

Abstract: Disclosed is a borescope-based inspection method for inspecting a condition of an externally invisible component of a device, in which method a change in the microstructure of the component material is determined based on a physical property and evaluated in relation to at least one reference physical value that accounts for aging of the component. Also disclosed is a system having a computing unit and at least one probe for performing such an inspection method for selecting, with the aid of or, in particular, by a computer, a non-destructive testing method for measuring the physical property and for actually measuring the physical property, for performing a comparison between a measured value and the reference value and for performing an evaluation of a tolerance between the measured value and the reference value.

Abstract: A method for repairing a rotor system (2) of a turbomachine, having a rotor (4) which has a groove (26) extending in the circumferential direction (58) of the rotor for accommodating an annular section (18; 28). The method has the following steps: chamfering a notch (40) in the groove (26); introducing a recess (44) into the groove (26); and inserting the annular section (18; 28) into the groove (26). At least one engagement element (48; 49) formed on the annular section (18; 28) engages in the recess (44) in order to form a lock against rotation in the circumferential direction (58).

Abstract: A method is disclosed for the repair of a component of a turbomachine, in particular a rotor of an aircraft gas turbine, with blades taken up in at least one groove and with at least one support region for limiting a blade tilt angle, whereby at least one segment, which has been subjected to wear, of the support region of the component is removed, and a coating that can be introduced in the unit on at least one supporting surface of at least one blade is formed on the component for limiting the blade tilt angle. In addition, a component of a turbomachine, in particular a rotor of an aircraft gas turbine, with at least one such repair site is disclosed.

Abstract: A method for repairing a rotor system (2) of a turbomachine, having a rotor (4) which has a groove (26) extending in the circumferential direction (58) of the rotor for accommodating an annular section (18; 28). The method has the following steps: chamfering a notch (40) in the groove (26); introducing a recess (44) into the groove (26); and inserting the annular section (18; 28) into the groove (26). At least one engagement element (48; 49) formed on the annular section (18; 28) engages in the recess (44) in order to form a lock against rotation in the circumferential direction (58).

Abstract: A process for producing plastic layers on gap sealing surfaces which are unaffected by temperature changes is provided. Plasma or acetylene oxygen flame is generated by a plasma or flame spraying burner, which melts a plastic mass under a cooling gas flow of from 40 to 150 SLpM and sprays it onto a gap sealing surface. Coatings produced by this process have dense to porous layer structures and, when polyphenylene sulfides are used as the plastic material, may be used up at to temperatures of 250.degree. C.