I found this on the official Wikipedia. I hope it's helpful to you because 767 also needs to solve this problem
The aircraft should be aligned to the x-axis as the forward flight direction, the positive y-axis towards the left and the positive z-axis pointing upwards. The origin of the model coordinate system should be placed close to the center of gravity.
Animated objects should have their axis and rotation pivots set to a plausible location. Hinged objects should have their local origin in their hinge location. The pivots and axes set in 3D Studio Max will be exported to the log files which will be used later on to animate the objects in the graphics section of the .tmd file.
Animated objects should be positioned in the following neutral positions before export:
- control surfaces neutral, flaps up
- gear down and compressed as if the aircraft would stay on the ground
- gear doors closed to assure perfect alignment when the gear is retracted in flight
- cabin doors and windows closed
- knobs and switches that are not planned to be animated should be in an in-flight position
- switches and knobs that will be animated are best exported in their off state
- instrument needles point to zero or neutral depending on the instrument
- magnetic compass points towards 090 degrees (East). This is needed because the x-axis of the global coordinate system of the Aerofly FS 2 points towards the East as well.
By the way, have you finished making your 330 glass material? I've tried countless times but it still can't display correctly