The Federal Home Loan Bank Board reported that conventional fixed-rate loans averaged 13.47% in February, down from January's 13.66%. Rates for the most popular adjustable-rate mortgages dipped to 11.64%, down from 11.83% in January. It was the seventh consecutive monthly decline. Rates in 1984 peaked in July at 15.23% for fixed-rate loans and at 12.94% for adjustable-rate mortgages. Since that time, they have been falling steadily.