FBI and Pentagon investigators are reviewing admissions by General Electric that test records may have been falsified at a factory that made parts for military and commercial aircraft, according to court documents and federal officials. The investigation centers on a check and drain valve for the F404 engine that powers the Navy's FA-18 fighter, GE spokesman Richard Kennedy said. The GE factory in question also makes an engine part used by the type of Boeing aircraft that crashed Sunday in Britain, killing 44 people, but federal and company officials said the part could not have caused the accident. The federal investigation began last year and has no connection with the accident in England.