Piper PA28, PA32, PA44 Pre 1977 versus Post 1976 December 05, 2019 15:04 Updated If the Main Entry Door (MED) on your aircraft looks like this, then you have a Late Model, post 1976 aircraft. Related articles Piper Nose Baggage Airworthiness Directive (AD) Key won't come out of lock - MAIN ENTRY DOOR Medeco Cylinder Maintenance & Lubrication Where can I find my keycode? Original lock was round with 2 flats, my new lock is round with 1 flat