Aircraft loads up dead, no activation window, no landing gear (SimConnect issue)

This issue is probably caused by an incorrect SimConnect runtime installation on your computer, follow these instructions to fix it:
  1. Navigate to this folder:
    <P3D root folder>\redist\FSX-RTM\lib
  2. Run the SimConnect.msi installer file inside the folder.
  3. Repeat the process in the FSX-SP1\lib and FSX-SP2-XPACK\lib folders.