Talk about bad teaching practices. Just about every flying school in Australia teaches the before landing checklist as "Undercarriage down and locked" even though the aircraft is a fixed landing gear aircraft. Yet you can bet the manufacturer's Pilot Information Handbook does not include this extraordinary check item. Nor does the AFM.
I am informed by a flying instructor at my local flying school that the reason for requiring the student to call undercarriage down and locked on a fixed gear aircraft, is that one day the pilot might fly a retractable and therefore is a GOOD THING to get used to.
I see. Then in that case should not the student call "undercarriage up and Locked" in a fixed gear aircraft for the after take off checklist - just to be consistent? Funnily enough I have never heard that used