Climb gradient requirement on SID

[jaja]

I seems there is some misunderstanding here regarding SID climb requirements.

The performance manual from your company will take care of ENGINE OUT climb requirements + a specific procedure to fly in case of an engine failure on that specific SID.

What you see on the SID chart, is a requirement for ALL ENGINES climb gradient, and that is a pilot responsibility to adhere to these. These restrictions are normally due to noise restrictions or for ATC purposes, but can of course also be because of obstacles.

You can NOT use "Rate of Climb thumb rules" here, as you have a segment where you are accelerating.
Instead you need a point, where you have to be at a certain altitude.


You can use this formula :

Required height (ft) = Distance (NM) X (req climb gradient 0,0x) X 6000



Let`s say you need a 4 % climb gradient to 13 NM.

Which altitude at 13 NM ? :

altitude = 13 X 0,04 X 6000
altitude = 3120

3120`

If you do not have a waypoint at 13 NM, create one in your Flightplan and see what altitude the FMS predicts there.



or another example. The SID asks for a 7 % climb gradient to 8000`

At what distance from departure do I need to be at 8000´ ? :

8000 = distance X 0,07 X 6000
8000 = distance X 420
8000/420 = distance

19 NM

again, create a waypoint at 19 NM, and see if the FMS predicts to be at or above 8000`there.


Easy