Tokyo, April 5 (BridgeNews) - Japan's index of leading indicators, which forecasts economic conditions two to six months ahead, fell to 42.9 in February from January's 44.4, the Cabinet Office's Economic and Social Research Institute said. The leading index was below the critical 50.0 "boom-or-bust" level for the second straight month in February. An index below 50.0 signals economic contraction, while one above the level indicates economic expansion.