Trusty old FAR 43.13 Appendix D provides the scope and detail of a 100-hour/annual inspection. Paragraph (d)(9) of that chapter makes clear that engine compartment accessories should be inspected "for apparent defects in security of mounting." That's it. If the starter, alternator, fuel pump, and carburetor are still attached to the engine in the same general manner and in the vicinity described by the manufacturer, then the requirements of a 100-hour/annual inspection have been met. Even a cursory check of the manufacturer's inspection guide for most light airplanes will only provide basic inspection criteria for accessory installations. While this is probably sufficient for most bolt-on accessories, notwithstanding time-life restrictions for some components, it should be recognized that there are more serious concerns for those accessories driven by internal engine gearing.
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