How often should pressure relief valves in an oxygen system be checked for functionality?

The recommended practice for checking pressure relief valves in an oxygen system involves inspecting them before every oxygen recharge. This is paramount because pressure relief valves play a critical role in ensuring the safety and functionality of the oxygen system. They are designed to release pressure in case it exceeds a predetermined limit, preventing potential overpressure incidents that could compromise system integrity or even lead to hazardous situations.

By checking the valves before each recharge, technicians can ensure they are functioning properly and are free from contaminants or malfunctions that could impair their operation. Regular checks in conjunction with the recharging process allow for proactive identification of any issues that may have developed since the last use. This practice contributes to the overall reliability of the cabin atmosphere control system, ensuring that oxygen supply is safe and effective during operation.

Options that suggest less frequent checks, such as annually or during monthly maintenance, could risk undetected failures of the valves, which are crucial at the point when the system is being prepared for use. Additionally, checking them every flight may be excessive and impractical if proper procedures are integrated into the recharge preparation process.