I flew many types of PA28, Cruiser, Warrior, Archer, and Dakota, and had no issue with the door becoming unlatched. I did however have a problem with a C172 having departed BWU (Sydney Bankstown) for YHOX (Liverpool Hoxton Park) after climbing out, at ca. 550ft. a massive noise of wind rush as the pax door became unlatched. a/s was 90kts.
I was able to reach over, and second attempt able to pull the door closed. I decided to return to BWU to check the lock on the a/c.
I wonder if a "Stabilized Approach Concept" would have made a difference to the outcome of the PA28 at Welshpool I had been taught this method, driving the PA28 cruiser in at a constant 75kts.?
Lance Shippey