CREATE TABLE table_22424 ("No. in series" TEXT, "Title" TEXT, "Directed By" TEXT, "Written By" TEXT, "air date" TEXT, "Production code" TEXT)

When arthur heinemann is the writer who is the director?
SELECT "Directed By" FROM table_22424 WHERE "Written By" = 'Arthur Heinemann'
SELECT "Directed By" FROM "table_22424" WHERE "Written By" = 'Arthur Heinemann'