What should be done in response to a small leak around the stem of a Rego blast valve?

In the case of a small leak around the stem of a Rego blast valve, turning off the fuel system and making an immediate landing is the most appropriate response. This action prioritizes safety by mitigating the risk of fire or explosion that could arise from fuel leakage while in flight. The Rego blast valve is crucial for managing fuel flow, and any malfunction or leak indicates a potential threat to the aircraft's operation. Taking immediate action helps prevent the situation from escalating into a more dangerous scenario.

Continuing to fly could lead to more serious consequences since leaks can worsen during flight. Though patching the valve temporarily may seem like a quick fix, it is not advisable in flight due to the dynamic environment and the potential for a leak to compromise safety. While contacting maintenance is important, doing so after addressing an immediate hazard is more prudent. Therefore, shutting off the fuel system and landing promptly effectively addresses the risk associated with the leak.