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1 in 60 rules and rate of descent, another technic? correct?

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  • 1 in 60 rules and rate of descent, another technic? correct?

    Hi I have a question regarding 060 Navigation module. I have used another technique than the prescribed 1 in 60 rule for this question, and I get a different result. I'd like to know if this technique is at least correct.

    Question: Given ILS glide path 3.5 degrees, GS = 150 kts. What is the ROD?

    They use the 1 in 60 rule: (3.5x150x100)/ 60 = 875= approx 900 ft/min.

    I did geometry: drawing a triangle of speeds, with :

    Click image for larger version

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    So the ROD is 7,85kts, which is 7,85NM/h, which is 7.85x6080 ft = 47728 ft/h which is (divided by 60min ) 795,47 ft/min close to 800 ft/min (NOT 900ft/min!)

    Thank you in advance for yout help!
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