During which phase of operation must the towbar be correctly matched to the aircraft type?

The correct answer is pushback, as this is the specific phase of operation where the aircraft is maneuvered backward from the gate or parking position, predominantly relying on the towbar for connection to the pushback tug. Ensuring that the towbar is properly matched to the aircraft type during this phase is crucial for safety and functionality. Different aircraft types require distinct towbar designs to accommodate variations in size, weight, and connection points. If the towbar is incorrectly matched, it can lead to difficulties during the pushback process or even cause damage to the aircraft or equipment if the towbar fails.

During taxiing, takeoff, and landing, the aircraft is primarily under its own power or controlled by pilot input, meaning the towbar is not used and therefore its correct matching is not relevant during these operations. The focus during those phases shifts to maintaining proper flight operations rather than equipment compatibility.