CREATE TABLE table_51869 ("Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT)

tell me the director of the production code ad1d02.
SELECT "Directed by" FROM table_51869 WHERE "Production code" = 'ad1d02'
SELECT "Directed by" FROM "table_51869" WHERE "Production code" = 'ad1d02'