Final answer:
The DC essential Buss circuit breaker marked "Pilot's CDU" would need to be pulled to reset a circuit.
Step-by-step explanation:
The DC essential Buss circuit breaker marked "Pilot's CDU" would have to be pulled to reset a circuit.
A circuit breaker is a safety device that automatically opens a circuit to protect the electrical system from damage caused by excessive current. When a circuit breaker is tripped, it interrupts the flow of current, and the breaker must be manually reset by pulling it to restore the circuit.
In this case, the DC essential Buss circuit breaker labeled "Pilot's CDU" needs to be pulled in order to reset a particular circuit.