Control information cannot be passed using which section of a flight progress strip?

The remarks section of a flight progress strip is specifically designated for non-essential, supplementary information that does not contribute to the active control of the aircraft. It is primarily used for notes or comments that may assist other controllers or personnel but do not convey operational data required for active control or separation of traffic. This makes it unsuitable for passing critical control information, which encompasses details necessary for managing the flight’s progress, such as altitude assignments or clearances.

In contrast, the other sections of the flight progress strip serve different functions that are crucial to air traffic control operations. The flight plan section includes essential details about the flight’s intended route, altitudes, and other required data. The data section contains the current status and operational information relevant to the flight, while the traffic section is used to monitor and communicate information about other aircraft in the vicinity. These sections are integral to ensuring safe and efficient aircraft management and separation.