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Joined 2 years ago
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Cake day: June 11th, 2023

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  • Why is anyone even talking about the controller?

    The controller asked the helicopter pilot if they had the jet in sight. The helicopter pilot said yes, and the helicopter pilot requested permission to maintain visual separation from the traffic. The controller granted that permission. The controller continued to monitor, and again asked the helicopter pilot if they had the jet in sight. The helicopter pilot again informed them that they did, and again requested to maintain their own, visual separation.

    Responsibility for this collision is on the helicopter pilot, not the controller.



  • The problem will be that the UPS has a charge controller built in, and that charge controller also tests the health of the batteries. It expects battery voltages to rise at specific rates as they charge, and current to match specific patterns. If the charge controller does not see the specific patterns it expects, it will report that the battery is failing.

    Charging profiles for Li-ion chemistries are completely different than for lead acid, and the output of the power bank is probably regulated with a boost/buck circuit, which would really confuse the charge controller.

    Trying to use 12v power banks to replace UPS batteries is just not a good idea.





  • You cannot positively control the actions of others, and others cannot positively control your actions. You can influence the actions of others, but you can only control your own.

    We can influence members of society to “stop taking advantage of people” all day long. But if you want to control whether people are taken advantage of, you have to address the victims rather than the perpetrators.

    Society can try to placate perpetrators. There’s little sense stealing something that everyone already has. We can appeal to the perpetrator’s empathy, but that assumes they have some. We can threaten repercussions and hope that has a deterrent effect. But, the final decision as to whether to perpetrate is always in the head of the perpetrator, and outside the reach of anyone else.

    If you want greater control over that decision, the only option you have is to take your own action.










  • Not a problem. FWIW, I’m not trying to excuse the pilots. The purpose of an FAA/NTSB investigation shouldn’t be to assign blame, but to prevent future incidents. Preventing the type of error the helicopter pilots made is probably not possible, which means it’s either going to happen again the next time such an error is made, or we make it so that making such an error doesn’t result in a collision.

    Safety and prevention are matters for the FAA and NTSB. Blame and liability are matters for the courts.


  • We do not have the full evidence available. I am comfortable at this time assigning primary responsibility to the helicopter pilot only because they specifically accepted that responsibility by requesting (and accepting) permission to maintain visual separation.

    I cannot rule out contributing factors. For example, the jet might have been below the glideslope; they might have both been in the wrong place. I don’t have the information one way or another to confirm that.

    There could be regulatory factors: it might have been improper for the FAA to establish that area as a helicopter route. It might have been improper for the ATC to grant permission for the helicopter to maintain visual separation under these conditions. There might have been electronic failures, preventing the aircraft from being aware of eachother. There could have been mechanical failures at a critical moment. The TCAS system might have recognized the conflict, but it is automatically inhibited below 1000 feet. The decision to inhibit TCAS RAs at 1000 feet instead of, say, 600 feet might have contributed.

    With all the possible contributory factors, I cannot agree with your conclusion that it is “ALL on the military pilots.”



  • This one doesn’t look like it’s on the FAA or the controller.

    The controller was aware of the possible conflict, informed the helicopter pilot - twice. And twice, the helicopter pilot informed the ATC that they had the conflicting traffic in sight, and requested permission to maintain their own, visual separation from that conflicting traffic.

    What seems to have happened is that the helicopter pilots saw a second jet in the distance, landing on another runway. They probably thought that second jet was the conflicting traffic, and they never actually saw the first.

    Additionally, the helicopter pilots were supposed to be in an established track on the east side of the river, no higher than 200 feet. Aircraft on final approach descend from east to west as they cross the river; there is more vertical clearance on the east side, but the helicopter was closer to the west side of the river. Further, the helicopter was flying at 300 feet, rather than 200.

    I don’t want to disparage the helicopter pilot(s), but from what I see right now, this seems to be primarily on them. They requested permission to (and responsibility for) maintaining separation - twice. This collision is primarily their responsibility.