PPRuNe Forums - View Single Post - TOD calculation query

4th Aug 2019, 18:01

#8 (permalink)

Check Airman

Join Date: Mar 2006

Location: USA

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I've seen 2 methods to this.

1. Altitude to lose in thousands x 3 = TOD

Need to lose 10,000ft, so 10x3 =30nm

2. Altitude to lose in FL ÷ 3 = TOD

Need to lose 10,000ft, so 100 ÷ 3 =33nm

The first method obviously produces a steeper descent.

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