At some time you might have the need to track specific items that are not currently in FOS. There is the ability for a little self-customization for items like Night Vision Goggles for Example, or Platform Landings.  

Start by accessing the Aircraft type record in which this will apply. Add the options to the Weight/Fuel/Crew Log tab. Select the Custom Type from the drop down. 

 

You'll also need to add this requirement in the Regulation under the Recent Experience Tab: 

Once these have been completed, you will now be able to see the options in the Flight Log.