Definition
A feature of the air traffic controller's communication system used during Precision Runway Monitor (PRM) approaches that allows the monitor controller to interrupt and speak directly to a pilot on the tower frequency, even when the pilot or another controller is transmitting. It ensures the monitor controller's instructions, particularly breakout commands, are heard immediately without waiting for the frequency to clear.
Plain English
It is a feature that lets the monitor controller cut into a busy radio frequency so the pilot hears the urgent instruction right away, no matter who else is talking at the time.
Context Anchor
Seen in PRM approach procedures for closely spaced parallel runways, where a monitor controller watches for aircraft drifting toward the other runway’s approach path.
Derivation
Override' comes from the idea of riding over something — taking precedence over it. In radio terms, the controller's transmission rides over whatever else is on the frequency so the pilot hears it without delay.
Why Pilots Care
Ensures the pilot retains final authority to resolve conflicts or prevent unsafe separation without waiting for system commands.
Grounding Statement
If an aircraft starts drifting toward another aircraft on a parallel approach, override capability lets the safety controller speak instantly instead of waiting for normal radio traffic to clear.
Intuition Check
Override capability does not mean the controller takes control of the airplane. It means the controller can take priority on the radio to give urgent instructions.
Example Sentence 1
Because the tower controller has override capability on the frequency, a breakout instruction from the PRM monitor will cut through any other transmission in progress.
Example Sentence 2
Training emphasized that override capability must be exercised smoothly to avoid inducing further alerts from the monitor.