How to fly a ILS/RNAV approach

Some useful rules to have fun flying ILS/RNAV approach manually even with non-perfect conditions. You’d better print them!

I saw some pilots flying  ILS/RNAV approach manually without PAPI lights or runway in sight, and seemed a bit strange to me until I found the following rules I am sharing with you. They are intended for 3 degrees glide paths.

Turn duration for ILS/LOC interception

Duration (in s)=∆ angle*3 

Where Delta Angle is the difference between your heading to intercept and the approach course the 3 is the degrees/second of the standard turning rate.

 

Bank Angle for the final turn

Bank ange= (speed/10)+7

Speed is intended as Indicated Air Speed, while the Bank Angle is in degrees.

 

Speed to maintain during APCH PATH (for liners)

200kts @ 10 miles

190kts @ 9 miles

And so on until configured at VREF+Wind correction.

 

Wind Correction Angle (WCA)

WCA=(∆wa*WS)/TAS

Were Delta wa is the difference between the wind direction and heading (final approach course). TAS is true air speed.

 

Vertical Speed

VS=GS*5

GS is Ground Speed

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