After downloading I took it out for a trial flight to see how it handled. Like the default aircraft it did not taxi worth a flip very slow making turns but manageable I took off with no problems and flew around the air port to land making sure to go far enough out so I could make a proper approach . Once I disengaged the auto throttle the plane fell out of the sky like a lead anvil. I could not control the decent. Normally I would just delete the aircraft but I decided to see if I could fix it.
The first thing I did was to compare the new plane's aircraft.cfg file with the default B747-400 but found only minor differences between the two so changing it was not going to help. I than decided to try something I have never done before I knew that the only other thing that effects how a aircraft handles in the air is the .AIR file so I wondered what would happen if I used the default .AIR file I had nothing to loose so I did
I could not believe it! it actually worked and now the plane handles good
All I had to do was to copy the file into the new plane's folder and than change the name in the Aircraft.cfg file
