  FE340SS/89--OPR-B660-HE; SIDE SCAN SONAR / DIVER INVEST. DISCOVERED AN ALUMINUM HULL AIRPLANE IN POS. LAT.41-59-06.54, LONG.72-45-01.91W (NAD 83) WITH A LEAST DEPTH OF 56.8 FT (17.3M). LORAN RATES: CHAIN 9960, W-15016.1, X-26452.6, Y-43903.8, Z-?. (UPD