UsageĮnter the required data into the calculator fields. Settings Click on the menu icons in this image to see other flyPad pages. Result: We need to start our descent 98 NM before the target fix with a vertical speed of -2 000 ft/min This will be included in the calculations. To allow for different ground speeds during descent, the calculator allows entering several altitude levels with the corresponding ground speed. Result: We need to start our descent 105 NM before the target fix with a vertical speed of - 2000 ft/min Ground Speed and Wind To calculate the TOD with a fixed vertical speed (rate of descent) we have to enter the starting altitude, the desired target altitude, and the desired vertical speed. For more precision, use one of the other two methods. The above result is averaged over the descent distance, and the values are approximations. Result: We need to start our descent 90 NM before the target fix with either an average vertical speed of - 2333 ft/min or an average descent angle of - 3.0° during the descent distance.

To calculate the TOD with a fixed distance to a specific fix, we have to enter the starting altitude, the desired target altitude, and the distance to the target fix. 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

Lighting Pedestal, AIDS, DFDR First Officer Side

A350 performance calculator