![]() Result: We need to start our descent 88 NM before the target fix, at which we want to reach 11 000 ft. Ground Speed: has no impact on the calculation because of the fixed angle.But 3° is a common standard descent angle in aviation and rarely needs to be changed. We can also enter a certain angle besides 3°. To calculate the TOD with a fixed angle of descent, we simply have to enter the starting altitude and the desired target altitude. The flyPad TOD calculator can be used for all of these scenarios. Descending from altitude X to altitude Y within a fixed vertical speed (e.g., - 2000 ft/min)ĭepending on the scenario, ground speeds are included in the calculation to take into account that we usually also slow down at some point during descent.Descending from altitude X to altitude Y within a fixed distance (e.g., 90 NM).Descending from altitude X to altitude Y with a fixed descent angle (commonly 3°).There are several scenarios for the TOD Calculation: This calculator helps the pilot to calculate when to start descending (aka the Top of Descent) based on various variables so that different scenarios can be calculated (e.g., descending with 3° descent rate, descending with a given vertical speed, etc.).įor more information about descent and approach planning, see our guide: Descent and Approach Planning Usage ![]() Settings Click on the menu icons in this image to see other flyPad pages. ![]() Lighting Pedestal, AIDS, DFDR First Officer Side
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