What additional inspection is required for aircraft used for training or hire besides the annual condition inspection?

The requirement for a 100-hour inspection comes from regulations that specify aircraft utilized for rental or flight training must have more frequent inspections compared to those used privately. This is to ensure the safety and airworthiness of the aircraft, as its usage tends to be more intensive due to the nature of training and hiring out to different pilots.

The 100-hour inspection is mandated if the aircraft is used for compensation or hire, and it must be accomplished after every 100 hours of flight time. This inspection serves as a critical checkup to identify any wear or potential issues that could arise from the frequent use that aircraft in a training environment typically experience.

In contrast, options like the bi-annual inspection, 50-hour inspection, and pre-flight inspection do not fulfill the specific regulatory need for heightened oversight required by aircraft used in training or rental operations.