🔍 Key Concepts

• Cartridge-operated dry chemical extinguisher design – separate propellant cartridge vs stored-pressure types • Who is normally permitted to service and recharge portable fire extinguishers under safety standards • Difference between recharging the propellant and refilling the dry chemical agent

💭 Think About

• Think about what actually happens once a cartridge-operated extinguisher has been discharged: what has been used up, and what must be restored for it to work again? • Consider safety and regulatory aspects: is it acceptable for untrained crew to take apart and recharge fire extinguishers on board? • Which options describe a procedure and which describe who is allowed to perform that procedure?

✅ Before You Answer

• Identify whether a cartridge-operated extinguisher stores pressure in a separate cartridge or directly in the cylinder with the powder • Check if both the propellant source and the dry chemical agent would need attention after use • Verify whether regulations and manufacturer instructions allow crew-level recharging or require authorized servicing personnel