content_image/528228.jpg
## PRM Benefits 

Typically, PRM is used with dual approaches with centerlines separated less than 4,300 feet but not less than 3,000 feet (under most conditions). [Figure 2-15] Separating the two final approach courses is a No Transgression Zone (NTZ) with surveillance of that zone provided by two controllers, one for each active approach. The system tracking software provides PRM monitor controllers with aircraft identification, position, speed, projected position, as well as visual and aural alerts. 

## Control Sequence 

The IFR system is flexible and accommodating if pilots do their homework, have as many frequencies as possible written down before they are needed, and have an alternate in mind if the flight cannot be completed as planned. Pilots should familiarize themselves with all the facilities 

and services available along the planned route of flight. [Figure 2-16] Always know where the nearest VFR conditions can be found, and be prepared to head in that direction if the situation deteriorates. 

A typical IFR flight, with departure and arrival at airports with control towers, would use the ATC facilities and services in the following sequence: 

1. FSS: Obtain a weather briefing for a departure, destination and alternate airports, and en route conditions, and then file a flight plan by calling 1-800-WX-BRIEF. 

2. ATIS: Preflight complete, listen for present conditions and the approach in use. 

3. Clearance Delivery: Prior to taxiing, obtain a departure clearance. 

<img src='content_image/528228.jpg'>

