What are the landing minimums when MALSR OTS (Approach Category C)?

The appropriate landing minimums for a runway with Medium Intensity Approach Lighting System with Runway Alignment (MALSR) Out of Service (OTS) for an approach category C aircraft is indeed 640-1 ¾.

This minimum represents the visibility and decision height (or runway visual range) necessary for an aircraft in approach category C. Category C categorizations are typically associated with aircraft that have a minimum decision height of between 200 feet and 250 feet, and a visibility requirement that corresponds to the specified visibility distance in the minimums.

Understanding this specific set of landing minimums ensures that pilots and dispatchers are aware of the necessary conditions for a safe landing, especially when certain aids, like the MALSR, are not operational. It reflects compliance with regulatory requirements and aviation safety standards.

The other choices do not match the established minimums under the condition of MALSR being out of service for approach category C. Therefore, they would not be applicable in this scenario.