14 CFR § 27.1143

There must be a separate power control for each engine.

Power controls must be grouped and arranged to allow—

Separate control of each engine; and

Simultaneous control of all engines.

Each power control must provide a positive and immediately responsive means of controlling its engine.

If a power control incorporates a fuel shutoff feature, the control must have a means to prevent the inadvertent movement of the control into the shutoff position. The means must—

Have a positive lock or stop at the idle position; and

Require a separate and distinct operation to place the control in the shutoff position.

For rotorcraft to be certificated for a 30-second OEI power rating, a means must be provided to automatically activate and control the 30-second OEI power and prevent any engine from exceeding the installed engine limits associated with the 30-second OEI power rating approved for the rotorcraft.