True or false, the fire engine's onboard air system may be used to recharge a water extinguisher?

Using the fire engine's onboard air system to recharge a water extinguisher is true. This functionality is particularly beneficial because it allows firefighters to maintain operational readiness and ensure that their equipment is prepared for use. The onboard air system typically provides a reliable source of compressed air, which can be used to pressurize the water extinguisher, aiding in its recharging process.

This practice is important because maintaining the functionality of water extinguishers is crucial for effective firefighting, and utilizing the fire engine's resources enhances efficiency. Overall, it's essential for firefighters to be well-versed in using all available tools and systems, including the onboard air system, to support their firefighting efforts.