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In scenarios where multiple pieces of approach equipment become inoperative, the new approach minimum is determined by taking the highest minimum of any single inoperative equipment. This approach is based on conservative safety measures. Capturing the highest minimum ensures that pilots maintain a level of safety required during the approach, as the absence of multiple pieces of equipment could add significant uncertainty to the landing procedure.

When an aircraft's approach is conducted with less than all of its intended equipment, the risk of missing critical information can increase. By using the highest minimum from any of the inoperative equipment, it creates a buffer or margin for safety that compensates for the lack of redundancy that those systems would have provided.

Other options, while they present distinct scenarios, would not offer the same level of safety. Choosing the lowest minimum of available equipment might prematurely lower the needed safety threshold under conditions where more robust systems were unavailable. Similarly, maintaining the original published approach minimum may not account for the current unavailability of equipment that could previously have mitigated risks. Averages also pose challenges since they could result in an unrealistically permissive minimum that does not prioritize safety. Therefore, resorting to the highest minimum from any equipment that is inoperative is indeed the safest course of action.