TAIPEI, March 17 (Reuters) - Taiwan Defence Minister Wellington Koo on Tuesday said he believed the U.S.' internal review process for the sale of a second package of arms to the island is proceeding on schedule. A major U.S. arms package for Taiwan worth about $14 billion that includes advanced interceptor missiles is ready for President Donald Trump's approval and could be signed after his upcoming trip to China, Reuters reported last week, citing sources briefed on the discussion.