Final answer:
The power takeoff (PTO) interlock system on the Kovatch-Volvo R-11 Refueler prevents the engine from starting or running when the PTO is engaged.
Step-by-step explanation:
The power takeoff (PTO) interlock system on the Kovatch-Volvo R-11 Refueler prevents the engine from starting or running when the PTO is engaged. This safety feature ensures that the PTO, which drives external equipment, such as pumps, is disengaged before the engine is started or operated. The interlock system uses sensors and controls to monitor the position of the PTO and communicate with the engine control module to prevent any unintended operation.