2 hours ago, Retroavia said:

... It works fine, even if get some sparks in take-off seesion. This effect is unfortunately often seen while using stearable seaplanes as AI. ...

To get rid of the sparks, you need to edit the aircraft.cfg file.

[EFFECTS]
wake=      fx_R4D_Wake
water=     fx_R4D_Splay_2
dirt=      fx_R4D_Dusty_3
concrete=  fx_AI_floatplane_spray-and-wake //fx_R4D_Belly_Sparks
startup=   fx_R4D_Cranky_Old_Bird_2   
//touchdown= fx_R4D_Tire_Mark, 1
contrail=  fx_R4D_Sky_Trail

I interactively intervene in traffic operations not only to extend the landing gear during the final stage of landing. I use the “Set Flight Plan...” command and route traffic along any of the most intricate flight plans created for the user's aircraft. (*.PLN)

fx_AI_float...

Thanks for our your generous help and support. Unfortunately the spark effect remains. So I obviously have to leave with.

Bernard

4 hours ago, Retroavia said:

... Unfortunately the spark effect remains...

The spark effect will definitely disappear and be replaced by water spray if you download the file fx_AI_floatplane_spray-and-wake.fx from the link in my previous post and place it in the /EFFECTS folder of your simulator.

I appreciate very much your support. I reinstalled the file you attached in your post. In fact I had it already before. Anyway, the sparkling effect still remains.

Bernard

19 minutes ago, Retroavia said:

.... Anyway, the sparkling effect still remains.

It seems that you did not correctly edit the [EFFECTS] section in the aircraft.cfg file.

[EFFECTS]

wake= fx_R4D_Wake

water= fx_R4D_Splay_2

dirt= fx_R4D_Dusty_3

concrete= fx_AI_floatplane_spray-and-wake //fx_R4D_Belly_Sparks

startup= fx_R4D_Cranky_Old_Bird_2

//touchdown= fx_R4D_Tire_Mark, 1

contrail= fx_R4D_Sky_Trail

Edited July 9Jul 9 by Sergiusz Bielicki