I'd say making a video, sharing it publicly and going through both the thought process to mitigate it once it happens as well as a lot of thought on prevention counts as learning.. care to share any mistakes you've made and what you learned from them?
I have in the past. I posted about my near icing related crash on the flight home from a long, and very thorough instrument check ride. We all make mistakes. We share those mistakes so others can learn from them. We should not however, seek to limit what people might learn from it, or fall prey to the temptation to chalking it up to random things that just happen.
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That said, I agree with you - to a point. The video certainly brings the issue to light and others can learn from it. However, there are also larger issues and lessons that need to be pointed out. Although apparently not *here* since we don't apparently don't want the OP (posting videos on youtube as a source of revenue) to feel bad.
There are also elements of a "stuff happens" victim sort of attitude evident in the video that we should not ignore, such as:
"but a few minutes later the latch has (just magically?) popped open"; and
"It's on my checklist. Which I actually use, but somehow I missed it this time."
It's obvious in the video that the OP didn't check the baggage door for a locked condition on his quick walk past it. I don't know how that possibly conforms with his statement that he uses the checklist.
To be fair, perhaps he just strives for never closing the baggage door without locking it. I do something similar with tow bars. If I have one on the aircraft it is in my hand and being actively used to move the aircraft. If it is not in my hand and being used to actively move the aircraft, it is removed from the aircraft and is safely placed where it won't get hit by or sucked into the prop(s). It's not a "checklist item" per se, but it's a practice I religiously follow after seeing the aftermath of a pilot forgetting about a tow bar he'd used on a Cherokee. That was about a $5K bill back in 1985. It would be closer to $15K now.
There's a lesson or two to learn there about checklists and about complacency.
In any event, shortly after walking past the baggage door with nothing more than a glance and no checklist in sight, he's walking up on the wing to enter the aircraft. If the forward cargo bay latch was secured before, it latch is clearly open at that point, and is clearly visible from the wing where he's at. That was a "last chance to catch it" opportunity that was lost.
There's another lesson for us. Those kinds of last minute visual checks for critical items are a valuable backup to the formal checklist.
Then there's my original point that has attracted so much ire. It's also a very valuable lesson. The OP had a door come open in flight a few months ago, and now he has had a baggage door come open in flight. Both are checklist items and both were missed. The fact that rates of improperly latched doors coming open on Cherokees, doesn't justify it. In fact, just the opposite, that increased potential requires greater diligence. That's the difference in the attitude that distinguishes a responsible, proactive pilot from someone who just plays a "victim" when stuff just "somehow" happens.
There's also a lot ot be learned from patterns and the power of past behavior being the best predictor of future behavior. For the OP that's two incidents in a short period of time. That's something that should be a concern to the OP in terms of how he preflights his aircraft - and perhaps on his focus when he preflights or flies his aircraft.
Let me digress for a minute to a more extreme example. My wife and I are cave divers and in particular we dive in small passages using closed circuit side mount rebreather, potentially a couple hundred feet deep and thousands of feet from the nearest exit. Training, experience, currency, proper equipment, redundancy and maintenance, thorough planning, discipline, adherence to the plan, and accurate self assessment of your skills and abilities relative to that particular dive are all critical to completing that dive safely.
It's diving conducted in a very hostile environment, yet it's the safest diving I've ever done as the focus is on controlling the variables and then training and equipping to manage everything you can't control. When people die cave diving, it's because they either violated one or more of the cardinal safety rules and/or they became complacent. Far more often, they just had a health issue like a heart attack or stroke that simply won't be survivable in that environment. The saving grace is that unless a team as a whole fails, or a teammate fails to recognize the developing trend line as an accident progresses and takes appropriate action, most fatal cave diving accidents are single death events.
Aviation is far less demanding. However it's far easier to become complacent. Worst of all, when you screw up in an airplane, you run a significant risk of killing or injuring other people as a result of your mistake.
Consequently...No. None of us get to just sit back and "say nice job!" after someone screws up or take the credit for "nicely handling" a potentially life threatening situation
that was 100% preventable.
The OP has has had two of those 100% preventable incidents in short order. He needs to take a hard look at how he preflights and how he flies. He needs to consider whether his video activities are distracting him from the more important activities such as "aviate, navigate, and communicate", not just in the air, but starting before he ever takes off. He may also need to take a hard look at whether he's in the right airplane for what he's doing. He needs to think hard on that and he needs to do that before he puts his family in the plane.
I look forward to a video talking about that rigorous self assessment.
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If any of the above make you uncomfortable as a reader, or if the OPs action strike you in some was as normal or acceptable, or worse, laudable, you probably need to take a hard look at your own flying.