Click on My Company > Aircraft in the main navigation
Click the aircraft tail number you want to edit
Click the serial number of the engine that is no longer active
In the edit window, deselect the active check box and click "Save"
5. Click "Add New"
6. Enter the values of the rental/new engine. Be sure to check "Rental" (if applicable) and then click "Active". If it is a rental and is temporarily replacing an engine already assigned a sequence, be sure to assign the same sequence value to the rental engine and click "Save"