Which of the following describes the two types of smoke detectors found in the fleet?

Which of the following describes the two types of smoke detectors found in the fleet?

• A. Ionized (electric power) and Smoke sampling ports (electric power)
• B. Ionized (electric power) and Photoelectric
• C. Smoke sampling ports (electric power) and Photoelectric
• D. Heat detectors

Answer: (A)

Two detector technologies used across the fleet are ionization detectors and air‑sampling detectors (smoke sampling ports). Ionization detectors use a small amount of radioactive material between electrodes; when smoke enters, the ion current is disrupted and the alarm triggers quickly, making them effective for flaming fires with fine particles. Air‑sampling detectors route cabin air through a network of ducts to a central sensor via sampling ports, allowing monitoring of a large area and early detection across compartments such as cargo holds and cabins. Photoelectric detectors are another common type in some settings, but they aren’t the two detector types described for this fleet. Heat detectors, which respond to temperature rise rather than smoke, aren’t part of the stated pair either.

Two detector technologies used across the fleet are ionization detectors and air‑sampling detectors (smoke sampling ports). Ionization detectors use a small amount of radioactive material between electrodes; when smoke enters, the ion current is disrupted and the alarm triggers quickly, making them effective for flaming fires with fine particles. Air‑sampling detectors route cabin air through a network of ducts to a central sensor via sampling ports, allowing monitoring of a large area and early detection across compartments such as cargo holds and cabins. Photoelectric detectors are another common type in some settings, but they aren’t the two detector types described for this fleet. Heat detectors, which respond to temperature rise rather than smoke, aren’t part of the stated pair either.