Which extinguisher uses a safety pin and seal during preflight?

• A. Halon Fire Extinguisher
• B. H2O Fire Extinguisher
• C. Both extinguishers
• D. Neither extinguisher

Answer: (A)

The main idea is that preflight checks verify that extinguishers are untouched and ready for use, and a safety pin with a tamper seal is the clear indicator of that readiness. Halon extinguishers used on aircraft are designed with a safety pin and a tamper-evident seal that must be in place and intact to show the unit hasn’t been discharged or opened inadvertently. This visual cue helps crew confirm the extinguisher is serviceable and ready for use. The preflight context in this question points to Halon as the extinguisher type that uses this pin-and-seal feature, whereas the H2O unit isn’t described in this scenario as requiring the same preflight indication.