What issue might cause the BOOST PUMP annunciator to cycle on and off?

The BOOST PUMP annunciator cycling on and off is typically associated with low fuel pressure conditions. In a fuel system, the boost pump is responsible for maintaining adequate fuel pressure to the engine, especially during critical phases of flight like takeoff and climb. When fuel pressure drops below a certain threshold, the boost pump activates to compensate and stabilize the fuel pressure. If the pressure is restored, the boost pump can turn off, leading to the observed cycling of the annunciator.

This behavior can indicate that the fuel system is trying to stabilize itself under conditions that could lead to engine performance issues if not corrected promptly. Therefore, recognizing this pattern is vital for flight safety and operational effectiveness, as it suggests that the fuel supply system requires attention to ensure reliable engine performance.