By going to a section Settings > Duties Setup you will find a page divided into 3 main sections.
3 options are available to be defined here:
To define a list of duties click on a New definition link. For a proper display, it should be one-letter code, for example, D for duty, T for training or V for vacation.
Right below there is a drop-down box where you need to select a Type of a duty: Duty, Off or Training. If the duty should be included in FTL calculations mark a checkbox AOC. For Operators that have more than one AOC set up in Leon, you can choose which AOC should apply to this specific duty. According to which FTL settings the specific duty should be calculated. This specific AOC will also reflect in FTL Sheet in AOC column.
Default times field allows you to define times that should be automatically chosen when you add a particular duty.
A drop-down box Aircraft can be used to assign your defined duty on a particular tail. In other words you can select aircraft registration, so that each aircraft will have a separate duty-colour.
Option Include in planning means that the crew the duty is assigned to will be automatically added to a flight on the day - on this particular aircraft (and will show up automatically in a section OPS). Assigned crew will remain attached to flights even if you change an aircraft registration, provided it is the same aircraft type.
A field Legend is where you should add a full duty name. You can also select a colour for the new duty to appear in the duty roster.
Some OM-A-7 regulations define different FDP and Duty period calculations when it comes to different types of Standby duties.
When you define Standby duty you need to select type 'Duty' and mark a checbox 'AOC', then select a standby type: