Engine Company was dispatched to the 6300 block of Hidden Valley Drive around 1745 hours for a report of a house on fire. While Engine 51 was responding Chief 1 advised Communications to start the working fire dispatch. First arriving units went on scene of a 1 story single family with heavy fire showing from side Alpha and Delta. Engine 51 arrived and assisted crews with opening up and water supply. Units operated for approx. 1 hour