On approach to Hyannis, the crew got a nosegear unsafe-warning. After a firm touchdown, followed by a go-around the problem was solved. When descending from 1500 feet in a left turn the crew received a visual ‘right engine fuel pressure low’ warning. Crossfeed was turned on with both fuel boost pumps activated. At 500 feet however, the engine lost power. Because a populated area was ahead, a forced landing was made on a beach. On landing, the aircraft struck three huge boulders, causing (a.o.) the no. 1 engine to separate. PROBABLE CAUSE: pilot in command – inadequate preflight preparation and/or planning pilot in command – mismanagement of fuel miscellaneous acts,conditions – ice-in fuel miscellaneous acts,conditions – failure of two or more engines terrain – other partial power loss – partial loss of power – 1 engine complete power loss – complete engine failure/flameout-1 engine