How many fire detectors are installed on each engine?

How many fire detectors are installed on each engine?

• A. 2
• B. 3
• C. 4
• D. 5

Answer: (B)

Fire detection coverage around an engine needs multiple detectors to catch a developing fire quickly and to stay reliable even if one detector has a fault. Placing three detectors in distinct zones around the engine covers the most likely fire locations: the crankcase area where oil fires can start, the fuel/lubrication side where leaks or vapor buildup can occur, and the exhaust or hot-turbo area where high temperatures can ignite flammable vapors. With three detectors, a fire must trigger more than one detector or be detected in one of several critical spots, which speeds warning and allows faster shutdown and response. Having only two detectors risks a blind spot where a fire could grow before being detected; adding more than three typically yields diminishing returns for the added cost and complexity. So, three detectors per engine balance effective coverage and reliability.

Fire detection coverage around an engine needs multiple detectors to catch a developing fire quickly and to stay reliable even if one detector has a fault. Placing three detectors in distinct zones around the engine covers the most likely fire locations: the crankcase area where oil fires can start, the fuel/lubrication side where leaks or vapor buildup can occur, and the exhaust or hot-turbo area where high temperatures can ignite flammable vapors. With three detectors, a fire must trigger more than one detector or be detected in one of several critical spots, which speeds warning and allows faster shutdown and response. Having only two detectors risks a blind spot where a fire could grow before being detected; adding more than three typically yields diminishing returns for the added cost and complexity. So, three detectors per engine balance effective coverage and reliability.