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  Friday 20 January 2017 05:44 GMT  

Aviation Rules of Thumb

Three Degree Glideslope

PREVIOUS Climb Rate for Obstable Clearance -- Index -- Descending Distance & Rate of Descent (RoD) NEXT

#1 - Divide groundspeed by 2, then add a zero.

example: 120kts / 2 = 60, add '0': 600 fpm


#2 - To maintain a 3 degree glideslope (eg. ILS) multiply your groundspeed by 5. The resulting number is the rate of descent to fly.

example: Groundspeed = 110 kts x 5 = 550 fpm rate of descent to maintain a 3 degree glideslope


#3 - With glideslope out on an ILS approach with DME, multiply the distance to go by 300. That should give you the height in feet you should be above the threshold.

example: 4 nm to the threshold. Multiply by 300 = 1200ft


#4 - Add a zero to your indicated speed, divide by two. This should keep you stabilized on the approach.

example: 150 knots on the GS. 150(0) / 2 = 750fpm descent. 120(0) / 2 =600fpm descent, etc.


#5 - Take your AGL height and divide it by three hundred. This is the distance from the threshold you need to start your three degree glidepath.

example: 600ft AGL / 300 = 2 nm

PREVIOUS Climb Rate for Obstable Clearance -- Index -- Descending Distance & Rate of Descent (RoD) NEXT

Aviation Rules of Thumb -- Flightsim Aviation Zone

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