FUTABA 12Z Series Instruction Manual page 62

IDLE DOWN
The Idle Down function lowers the engines idle
The action is not functional at high throttle to avoid
accidental dead sticks. The switch's location and
direction must be chosen, as it defaults to NULL.
[Return Key]
Idle down setting procedure
*Perform the following settings after using the cursor lever to
move the cursor to the item you want to set.
(For a detailed description of the setting method, see [Switch
Setting Method] at the back of this manual.)
(When the enter button is pushed for 1 second, the offset rate
is reset to the initial value.)
*Maximum offset amount is near maximum slow.
62 <Functions of Linkage Menu>
[Cursor Lever]
[Data Input Dial]
PUSH
[Enter Button]