Testing blending scopes on the D-18T engine

In December 2018, the TBS-6 blending scopes were fitted and tested on the service engine D-18T (Fig.1) by specialists of SE Ivchenko- Progress in cooperation with consultants of Richard Wolf GmbH. A broad list of available TBS-6 heads makes possible blending of all stages of the D-18T engine compressor that have process inspection windows (Fig.2). Based on the results of the work, it is planned to introduce

the application of this equipment in the maintenance documentation, and perform similar work on other types of engines developed by the enterprise.

For reference: Improvement of the aircraft fleet efficiency is an extremely important issue for civil aviation operators that perform passenger air service in a highly competitive market. Mechanical damages of compressor blades due to ingestion of foreign matters contribute to a premature removal of engines. Such damages occur

essentially during landing or take-off run of an aircraft. Ingested foreign matters cause nicks, bents, grooves (scratches) on flowpath blades. The risk of mentioned damages is that they can lead to the development of cracks and as a consequence the breakage of blades and the engine failure.

The application of special blade blending equipment like the TBS-6 Blending scope from Richard Wolf GmbH can positively resolve the problem. Richard Wolf GmbH has been involved in the development and manufacture of devices for blending compressor blades of aircraft engines since the 1980s, and is now the top supplier of this equipment.

This technology makes it possible to remove nicks by lowering the operating stress in those areas without disassembling the engine under service conditions.

Fig. 1 Appearance of the TBS-6 blendoscope from Richard Wolf GmbH

Fig. 2 Process of cleaning compressor blades