Three different ILS Approaches

Dependent Parallel Approach

Simultaneous Parallel Approach

Simultaneous Close (indep.) Parallel Approach PRM

- RWY's centerlines must be separated by

at least 2.500 ft

- A/C must be separate diagonally by

a minimum of 1-1/2 nm.

 

- A/C must be separated by 2nm diagonally for RWY centerlines separated between

4,300ft and 9,000ft – WITHOUT a final monitoring by ATC

- separation is provided by radar

 

 

> NTZ → No Transgression Zone

> NOZ → Normal Operating Zone

- RWY centerline separation between 4.300 and 9.000ft WITH a final monitor ATC.

(ATC eliminates the need for staggered appr)

- no diagonal separation required

 

final monitor ATC advises pilots IF deviating from the LOC course.

 

 

Triple Simultaneous Approaches

- are authorized if RWY CTL's are separated by at least 5.000 ft and are below 1000 ft MSL

IF ABOVE 1000FT MSL

- ASR monitoring or high update radar with final monitoring aid is required

Precision Runway Monitor

- for parallel RWY's with a separation between 3.400 ft and 4.300 ft

 

The PRM system contains a high-update radar

with a one second interval

position and velocity is updated every second

 

- Appr requires an approriate system and controller as well as two tower frequencies

 

- special crew training is required for P121/135 (FAA)

3 different ils approaches.JPG