How often must ARFF communications systems be tested under Part 139?

• A. Every 12 hours
• B. Every 24 hours
• C. Every 48 hours
• D. Every week

Answer: (B)

Under Part 139 regulations, the testing of Aircraft Rescue and Fire Fighting (ARFF) communications systems is mandated to occur every 24 hours. This frequent testing ensures that emergency communications remain functional and reliable, which is crucial for timely response during an incident at an airport. The 24-hour requirement helps maintain a consistent check on equipment status and operational readiness, thereby enhancing safety measures in airport operations.

The prescribed frequency underscores the importance of having a robust communication network for effective coordination and response in emergency situations. Regular testing confirms the integrity of the systems, allowing fire fighting teams to effectively communicate and respond to incidents, which is vital for minimizing risks and safeguarding lives and property at the airport.

In contrast, other options represent intervals that do not meet regulatory standards for the reliability and immediacy required in emergency situations, thus highlighting the necessity of the correct answer in supporting continual operational readiness.