- FGAtmosphere* Atmosphere;
- FGFCS* FCS;
- FGPropulsion* Propulsion;
- FGMassBalance* MassBalance;
- FGAerodynamics* Aerodynamics;
- FGInertial* Inertial;
- FGGroundReactions* GroundReactions;
- FGExternalReactions* ExternalReactions;
- FGBuoyantForces* BuoyantForces;
- FGAircraft* Aircraft;
- FGPropagate* Propagate;
- FGAuxiliary* Auxiliary;