Special Features:

During non-destructive inspection of the internal sections of the f405 rr 401 engine it is to view the combustion liner and high pressure nozzle guide vanes from various angles and distances to determine the condition of these components.

Properties:

An item consisting of a cell, optical element in which is secured one or more optical elements, such as lenses, reticles, filters, windows, and the like. May include retaining rings, spacers, and/or separators. For items with focusing facilities and/or a diopter scale, see eyepiece assembly, optical instrument.