CREATE TABLE table_11589522_3 (original_air_date VARCHAR, written_by VARCHAR)

what's the original air date where written by is iain morris & damon beesley
SELECT original_air_date FROM table_11589522_3 WHERE written_by = "Iain Morris & Damon Beesley"
SELECT "original_air_date" FROM "table_11589522_3" WHERE "Iain Morris & Damon Beesley" = "written_by"