Plain English Meaning

Warnings you can both see and hear at the same time. Something flashes or lights up on a screen, and a sound or spoken message plays, so you notice the warning right away even if you happen to be looking elsewhere.

Full Definition

Warnings provided to pilots through both sight and sound — typically a flashing or coloured indication on a cockpit display combined with a tone, voice callout, or other audible signal — used to draw immediate attention to a condition that requires action, such as a deviation from a protected approach corridor during a Precision Runway Monitor (PRM) approach.

Context Anchor

In the Precision Runway Monitor benefits discussion, this refers to alerts used by controllers to notice quickly when an aircraft is moving away from its expected approach path during closely spaced parallel approaches.