An aimed measure is to be understood under the heading “inspection” ( "Ill. 4.1-1"), serving to estimate the technical condition of particular components or groups (Ill. 4.1.1-1). Here, merely a part of the engine or an entire module is affected. The inspection does not require any huge effort of disassembly; if possible, the former is carried out on the engine while in operation, according to the manual or for an actual reason.

During normal, static times, the engine and its periphery let themselves be examined for particularities such as outer signs of leakages ( "Ill. 4.1-1"0). In the framework of oil and filter changes or a magnet chip detector inspection ( "Ill. 3.5-5", "Ill. 3.5-7" and "Ill. 4.1-4") incipient damages can be identified by an investigation through impurities and residues. Maintenance, recalibration and cleaning of probes (3.6.2-1) reveal their condition and indicate alterations on operation data. Borescope inspections can give important insights ( "Ill. 4.1-5" up to "Ill. 4.1-8"). Frequently, however, assistance from the manufacturer is required along with the necessary equipment and the evaluation. Thus, such inspections are only possible within relatively large time intervals ( "Ill. 4.1-1").

In especial cases, e.g., if there is a weak point on a particular type of engine that must be re examined by all other operators, it may be necessary to implement the work during a suitable static time. When there are sufficiently long static times, hot part inspections on combustors and turbines can be tackled. The inspection effort is not least depending on the engine design. So, e.g., axial split casings can be especially beneficial because they allow the remove of one half to exchange blades and vanes. That is also true for tubular combustion chambers that are better accessible from the outside when the dome is removed.