What is the altitude when operating within the Mustang working area?

The correct altitude when operating within the Mustang working area is set at a maximum of 17,500 feet MSL (Mean Sea Level). This altitude limit is established to ensure safe operations and separate different types of airspace usage while accommodating various aircraft and their respective performance capabilities.

Setting the maximum altitude at 17,500 feet provides a buffer zone that helps manage traffic, maintain safety standards, and allows for effective communication and coordination among pilots operating in and around the working area. It also aligns with common airspace regulations that define where certain types of operations can safely occur, facilitating an efficient airspace structure.

This altitude limit contrasts with the other options, which either do not provide adequate separation for safe flight operations or fall below standard operational thresholds expected in controlled areas, thereby making them unsuitable for the Mustang working area's defined operational parameters.