On offshore drilling units where foam systems are installed on the heliport, the system must be able to discharge continuously for at least __________.

Correct Answer: Option A — 5 minutes

Under 46 CFR 108.489, fire extinguishing foam systems protecting helicopter decks on mobile offshore drilling units must possess sufficient foam concentrate and water supply to discharge continuously for a minimum of 5 minutes at full system design application rate, ensuring rapid suppression of aviation fuel fires.