FAA A&P Mechanics Practice Test - Comprehensive Prep & Practice Exam

The three main components of a Military Standard flareless-tube fitting are the body, the sleeve, and a nut. This type of fitting is designed for hydraulic systems and ensures a leak-tight connection while allowing for easy disassembly and reassembly.

The body serves as the main structure that houses the other components and provides the interface for attachment to the hydraulic tube and the other fitting. The sleeve acts as a compressive element that secures the tube against the fitting body, creating a strong seal. The nut is crucial as it applies the necessary force to drive the sleeve onto the fitting body, thereby compressing the tube and forming a reliable and leak-free connection.

This design is particularly advantageous in military applications, where reliability and performance under various conditions are essential.