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
