Why JFS 2?
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Why do we use JFS 2 first?
It’s not only in BMS; I’ve seen it also IRL
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Logically I thought JFS 1, then you also got JFS 2 after in case you need it.I’m probably missing something.
Cheers!
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JFS 2 dumps both hydraulic accumulators into the JFS for an increased percentage rate of starting the JFS. The only downside is if the JFS doesn’t start then the accumulators have to be pumped up manually in the wheelwell. Something like 150 pumps for the crew chief.
Rob
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Ah! Was under the impression it was two separate accumulators. Makes sense now, thanks!
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Just to be clear. There are 2 JFS accumulators in total. (JFS1) dumps 1 accumuator and (JFS2) dumps both accumulators at the same time.
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The 2 JFS Accumulators are located in the bottom of the engine bay, between the 2 ventral fins. Here is a picture of them. They are the long yellow tubes.
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It’s interesting that they are not spherical. Probably it’s because of lack of space.
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Imagine a piston inside, nitrogen on one side, hydraulic oil on the other side and the shape is obvious [emoji3], these are not the nitrogen bottles it self.
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Same (JFS/BRAKE) bottles also provide hydraulic pressure for the brake system when the engine is not running. So repeatedly pushing the brakes on the ground with the engine not operating will eventually result in lack of pressure to start the engine [emoji6].