General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

What does the primary flight computer DISC light indicate?

1. PFC is malfunctioning

2. Indicates the PFCs are disconnected and the system is in DIRECT mode

3. The flight control system is in standby

4. PFCs are actively controlling the flight

The correct answer is: Indicates the PFCs are disconnected and the system is in DIRECT mode

The primary flight computer DISC light serves an important function in alerting the pilot to the operational status of the primary flight control systems. When this light is illuminated, it specifically indicates that the primary flight computers (PFCs) are disconnected and that the system has entered DIRECT mode. In this mode, the aircraft's control laws are bypassed, and pilots have direct control over the flight control surfaces. This is essential information for pilots, as it signals a departure from normal automated controls, requiring manual operation and heightened situational awareness. Understanding the implications of the DISC light is crucial, especially in circumstances where automated systems may fail or require override. In contrast to other options, which suggest different system statuses, only this choice accurately reflects the specific indication given by the DISC light. While other options may reference malfunctions or standby modes, they do not capture the precise condition that the DISC light signifies in regards to the PFCs' operational state. This understanding ensures that pilots can take the necessary actions to maintain control under varying circumstances.