The ionization type smoke detector is found in which combination of areas?

• A. Flight deck and crew rest area.
• B. Lavatory and electronics rack.
• C. Cargo hold.
• D. Passenger seating area.

Answer: (B)

Ionization smoke detectors are best for areas where fires tend to ignite and spread rapidly with small smoke particles. They’re particularly suited to locations with electrical equipment or confined spaces where a quick alarm is crucial. In lavatories and electronics racks, electrical faults or burn events can produce fast-flaming fires and fine smoke, so an ionization detector provides an early alert. Other areas, like larger open spaces or compartments with different fire dynamics, often rely on detectors chosen for those conditions to balance sensitivity and nuisance alarms, making the lavatory and electronics rack combination the most appropriate setting for ionization sensors.