Which of the following is a location where an ionization type smoke detector is located?

• A. Engine room.
• B. Lavatory and electronics rack.
• C. Cockpit.
• D. Passenger seating area.

Answer: (B)

Ionization smoke detectors are chosen for areas where fires can start and spread quickly from burning fuels or electrical faults, and where rapid warning is crucial. Small, enclosed spaces with electrical equipment, like electronics racks, are prime spots because electrical faults can produce flames and smoke fast, and the detector’s quick response helps enable fast suppression. Lavatories are another such space since they are compact and can harbor electrical heat sources or waste materials that ignite, so placing ionization detectors there allows swift detection.

Engine rooms and cockpits typically rely on other sensing methods tailored to their specific fire risks and to avoid nuisance alarms from ventilation or other cabin activities. Passenger seating areas are usually covered by detectors designed to tolerate cabin airflow and steam, which makes the ionization type less suitable there.

So, the best location for an ionization type smoke detector in this context is the lavatory and electronics rack.