In this paper the question is addressed how Interactive Electronic Technical Manuals (IETMs) can be used in the training of maintenance engineers. In order to investigate these questions, we adopted the following approach. We investigated the state-of-the-art concerning IETMs and training. An analysis was made of how an IETM could be used in the current courses for helicopter maintenance engineers. Several training scenarios were investigated: Training embedded in the IETM, IETMs as a source for learning materials, and as a tool in the learning process. Demonstrators were constructed showing how IETMs can be used in training. The electronic manual for a helicopter, available in SGML format, served as the source for the development of demonstrators. The demonstrators show that an instructor can develop tailored instructional materials by (re)-using existing electronic materials with standard presentation and word processing tools.