FAA Powerplant Written Practice Test

When is a Built-In Test Equipment (BITE) test performed for engine fire detection on a Boeing 777?

1. Every 10 minutes during flight

2. When power is applied, after a power interrupt, and every 5 minutes of operation

3. At the end of each flight

4. Only during maintenance checks

The correct answer is: When power is applied, after a power interrupt, and every 5 minutes of operation

The BITE test for engine fire detection on a Boeing 777 is designed to ensure that the fire detection systems are operational and capable of responding effectively in the event of a fire. This testing occurs when power is applied to the system, after any interruption in the power supply, and subsequently every 5 minutes of operation. This routine ensures that both the initial readiness of the system and its continuous operational status are validated throughout the flight. By performing this test at these specific intervals, the aircraft can quickly detect any malfunctions in the fire detection system, allowing for immediate action to be taken if necessary. Utilizing a proactive approach in monitoring critical systems enhances safety, ensuring the crew can rely on the fire detection systems at all times during operation.