Twin Commander
General Category => Electrical => Topic started by: Roberto Serrano on December 17, 2022, 12:09:21 pm
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What is purpose or why they put two CB on electrical system on the 840 and 1000 series on the late models to tie the electrical system between the distribution bus 1 and 2 in case of a failure instead of one CB in the early models
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I believe the idea was to increase separation between the busses in the even of a major short circuit. I think you are talking about the split bus on the 695B, 900, and a very few 840s which had CB panels on both left and right sides of the cockpit. I'm pretty sure no 980s were made with that system.
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Yes, I’m talking about those come with the split bus panel….
thanks for you comments. Let see if someone else come with some more information.
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I will have to look. I have a 695B AFM which should discuss it.
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Donv. I wondering if I can email you some info to get a better idea about it.
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You can email (or private message) me if you like, but no reason not to just discuss it here. I will see if I can get an answer from Barry Lane, who is the real expert.
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Ok. Barry Lane is in this group ?
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Barry is not, despite my best efforts. However, he is the best Commander training guy around!
Here is what he said:
The split main bus was a response to the European requirement that ALL buses have protection. The main bus was split and given CB protection. Those airplanes have bus ties, which you are familiar with their operation. They also have main bus ties which are always in and only trip when there is an issue with the main bus or possibly a generator. The benefit to the split main bus system is we can now isolate the batteries if there’s a problem there and continue to run the electrical system off of the generators respectively.
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This is Barry's website, in case you need some training:
https://www.thecommanderguy.com
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Thank you so much for the answer.