I didn't expect my comment to go over well with the OP or with a number of other people in the thread.
Keep in mind however, that one incident with a door coming open in flight is just that - a single incident. Having a similar event happen again now makes it a pattern that *should* compel the person to change whatever pattern of behavior is causing the repeated event.
I'm hoping the OP realizes he needs to not just ensure all the latches on his Cherokee Six door engage, but also that the baggage door is not just latched but also locked. And in the bigger picture that he needs to be very cognizant of the need to recognize potential failure points and pay more attention to those details.
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Sometimes it's hard to acknowledge that there is more involved than just "stuff happens" - and then patting ourselves on the back for managing it well, while glossing over the prevention aspects. I was discussing a series of incidents with someone in my office when I almost literally saw the light bulb go off. He then nodded, sighed, and said:
"During my third divorce, I looked around the courtroom and realized I was the only person who was present at all three of them. I realized that in one way or another, I was at least partly responsible for all of them. You're saying it's the same thing here. You're right."
That's personal growth and the first step toward not making a similar mistake in the future. "Stuff" does indeed "happen". What's important is how you respond to it to keep similar "stuff" it from "happening" in the future.
We can all choose to either take ownership and positive control of the events that lead up to accidents and incidents and prevent them, or we can continue to just let stuff happen. It's our choice. Choose wisely.