How many seconds of fuel does the flip-flop valve in the collector tank provide?

The correct answer is that the flip-flop valve in the collector tank provides a fuel supply of 15 seconds. This valve plays a critical role in maintaining the aircraft's engine performance during specific conditions, such as when the aircraft experiences a sudden change in orientation, like during maneuvers or when there is a low fuel situation in one of the fuel cells. The function of the flip-flop valve ensures that fuel continues to flow to the engine for a brief period, allowing the pilot adequate time to manage the aircraft’s systems and maintain engine operation without immediate interruption.

Understanding the timing of fuel availability in the event of an engine feed issue is essential for safe flight operations. A 15-second fuel supply from the flip-flop valve provides a buffer to support the engine during transitional phases, which is crucial for the aircraft's reliability and safety in flight.