Why is it important for commercial or host nation procedures to be reviewed by a MAJCOM TERPS specialist prior to their use?

The importance of having commercial or host nation procedures reviewed by a MAJCOM TERPS specialist primarily lies in the standardization of obstruction clearance. Standard obstruction clearance is crucial in ensuring that instrument procedures provide a safe environment for aircraft operations. This involves evaluating the procedures to ensure that they maintain the necessary clearance from obstacles in the vicinity of the flight path, regardless of how well the aircraft is operated.

This oversight helps in mitigating risks associated with obstacles that might not be adequately accounted for in the original procedure development. Hence, the review process is vital to ensure that even if a procedure is correctly flown, it adheres to the established standards for clearance, ensuring the safety of operations in diverse operational environments.

The other choices, while they touch on important aspects of aviation safety and operation, do not directly address the primary function of the review by a MAJCOM TERPS specialist, which is focused specifically on obstruction clearance standardization in instrument procedure design.