Menu navigation - combined instrument panel
The left-hand stalk controls the menus shown on the information display in the combined instrument panel. Which menus are shown depends on the key position.
Display (analogue combined instrument panel) and controls for menu navigation.
Display (digital combined instrument panel) and controls for menu navigation.
OK – access to message list and message confirmation. 
Thumbwheel – browse between menu options. 
RESET – reset the active function. Used in certain cases to select/activate a function, see the explanation under each respective function.
If there is a message then it must be acknowledged with OK in order that the menus shall be shown.