FAA Powerplant Written Practice Test

When is a BITE test performed on the engine fire detection system of a Boeing 777?

1. Only at startup

2. When power is applied, after power interrupt, or every 5 minutes

3. Once per flight

4. Every hour of operation

The correct answer is: When power is applied, after power interrupt, or every 5 minutes

A BITE test, or Built-In Test Equipment test, is specifically designed to assess the functionality of the engine fire detection system in an aircraft like the Boeing 777. This test is performed when power is applied to the system, after a power interruption, or at regular intervals, typically every 5 minutes during flight. This approach ensures that the fire detection system is continually monitored for faults during critical phases of flight, providing immediate feedback regarding the operational state of essential firefighting equipment. It is crucial that the system is functioning correctly at all times, especially given the potential hazards associated with engine fires. The regularity of the BITE test allows for quick identification of any engineering issues, thus enhancing safety and reliability. Regular testing during these specific conditions allows for immediate corrective actions if any abnormal readings or system failures are detected.