Why should a technician avoid using flared fittings in high vibration environments?

Using flared fittings in high vibration environments is not advisable primarily because they can come loose and create leaks under constant movement or shaking. In such conditions, the mechanical interlock of the flared connection can be compromised. The vibration can cause the fitting to gradually loosen, ultimately leading to a failure in the seal. This happens because the mating surfaces may lose contact over time, resulting in fluid leakage, which can be detrimental in many applications, especially those involving hydraulic or pneumatic systems where maintaining pressure is crucial.

In contrast, threaded fittings or compression fittings tend to provide a more secure and stable connection in environments subject to significant vibration. They can better sustain the forces generated by movement, ensuring the integrity of the connection over time.