What phraseology should be used to report a disabled aircraft on the runway?

The phrase "Disabled aircraft on runway" is the standard phraseology used in aviation communications to clearly convey the condition of an aircraft that has become inoperative on the runway. This specific wording ensures that all relevant parties, including air traffic controllers and pilots, fully understand the nature of the situation. Clear and unambiguous communication is vital for ensuring safety and effective management of air traffic, particularly in emergencies or unusual situations.

Using this precise language helps alert other aircraft and ground services to the presence of a hazard on the runway, allowing for the appropriate responses to be initiated. This phrase captures both the state of the aircraft (disabled) and its location (on runway) succinctly. Effective communication in such scenarios helps prevent accidents and promotes efficient resolution of the situation.

The other options, while they may indicate something problematic is happening, do not specify that there is a disabled aircraft on the runway, which is critical information for managing air traffic and ensuring the safety of ongoing operations.