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Calculation of Descent Rates

  • Aviatordan
  • Topic Author

Aviatordan created the topic: Calculation of Descent Rates

G'day Bob,

I've done a couple of the exams in the textbook as well as on the AFT practice cyber exams and I keep getting the calculation of descent rates for ILS approaches wrong. I understand the theory behind the rule of thumb of 5 x your GS, however why is this answer so different compared to the table in DAPS, which is what I have been using and therefore getting the wrong answer?

100 kts, 3 degrees
Rule of thumb - 5 x 100 = 500 fpm

DISREGARD - ANSWERED MY OWN QUESTION
#1

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  • Mister W

Mister W replied the topic: Calculation of Descent Rates

Hi Dan,
When using the DAP table, be careful that you are not looking the wrong figure. 3.0% instead of 3.0°.
3.0° @ 100kts will give you about 550fpm.
3.0% @100kts will give you 300fpm.

And of course, there will be a "come in spinner!" answer for going off the wrong one.

Hope this Helps.

Mister W.

EDIT - I see you found the problem.
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  • Aviatordan
  • Topic Author

Aviatordan replied the topic: Calculation of Descent Rates

Hey Mister,

Thanks for the reply! Yeah, literally 5 minutes after posting I took a closer look and realised the error in my ways.

Cheers,

Dan
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