Definition
A second radio frequency, separate from the tower frequency, used during simultaneous close parallel Precision Runway Monitor (PRM) approaches. The pilot monitors this frequency in addition to the tower frequency so that PRM monitor controllers can issue immediate breakout instructions if an aircraft on the adjacent parallel approach deviates toward the protected zone between runways.
Plain English
An extra radio frequency you listen to during a PRM approach so a dedicated controller can quickly tell you to break off the approach if a nearby aircraft strays toward you.
Context Anchor
Seen on PRM approach charts and used during simultaneous close parallel approaches, where aircraft are landing on nearby parallel runways at the same time.
Derivation
PRM stands for Precision Runway Monitor — a high-update radar system that monitors aircraft on closely spaced parallel approaches. The 'frequency' is the dedicated radio channel that supports that monitoring function.
Why Pilots Care
Enables safe simultaneous operations on closely spaced parallel runways by giving controllers real-time deviation detection and the ability to intervene instantly.
Intuition Check
Frequency does not mean how often something happens here. In this context, it means the specific radio channel the pilot listens to for PRM monitoring instructions.
Example Sentence 1
The approach briefing reminded the crew to tune the PRM frequency on the second radio before being cleared for the ILS PRM approach.
Example Sentence 2
ATC advised the crew to monitor the PRM frequency for any last-second heading corrections.