Definition
An RNAV (Area Navigation) instrument approach procedure that has been authorized for use to closely spaced parallel runways under PRM (Precision Runway Monitor) procedures, requiring high-update radar monitoring of the parallel approach courses to ensure safe separation between aircraft on simultaneous independent approaches.
Plain English
It is a GPS-based approach to one of two closely spaced parallel runways, flown while controllers use special fast-updating radar to watch both streams of traffic and keep them safely apart.
Context Anchor
Seen in FAA glossary references, approach chart titles, and briefings for airports that use closely spaced parallel runways.
Derivation
PRM stands for Precision Runway Monitor — 'precision' here meaning a high-accuracy, fast-updating radar, and 'monitor' meaning controllers watching the approach paths. RNAV stands for Area Navigation, which lets aircraft fly any chosen path between waypoints rather than only along ground-based navaids. Stacking the labels signals: an RNAV approach being conducted under PRM monitoring rules.
Why Pilots Care
Enables higher airport arrival rates while maintaining strict separation between aircraft on parallel runways.
Grounding Statement
Picture two aircraft approaching two nearby parallel runways at the same time, with controllers specifically monitoring each aircraft to keep the operation safe.
Intuition Check
Do not read RNAV PRM as just a normal RNAV approach. The PRM label means special monitoring and pilot responsibilities are part of the approach.
Example Sentence 1
Before accepting the RNAV PRM approach to Runway 28R, the crew reviewed the PRM attachment and briefed the breakout procedure.
Example Sentence 2
Pilots must monitor the PRM frequency during the RNAV PRM approach in case a breakout is required.