Final answer:
Fuel cannot be dumped with either a BINGO or FUEL LO caution displayed.
Step-by-step explanation:
The statement is true, fuel cannot be dumped when either a BINGO (low fuel) or FUEL LO (fuel low) caution is displayed. These cautions indicate that the aircraft is low on fuel and dumping fuel in such situations can be dangerous.
When an aircraft experiences a fuel emergency, such as an engine failure or a need to reduce weight for an emergency landing, it may be necessary to dump fuel. However, this should only be done in accordance with established procedures and guidelines, following all safety precautions.