CABIN HEAT MIXING AIR GRD/FLT
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Good morning, from what I understand, when operating in FLT mode, the air from the P2.5 compressor stage is released to the atmosphere, and when in GND mode, the air from the P2.5 stage is mixed with the air from the P3 stage, which then passes through the temperature controller and is sent to the cabin. However, when I view it on the tablet, it seems that this controller is reversed; when I put it in GRD mode, the air is escaping. I would like to know if I am misinterpreting the diagram.
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Thanks for letting me know. I've answered in the other thread on the subject.
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Another thing I noticed is that when I'm at over 92% power and the lever is in the GRD position, the cabin heats up faster, but from what I understand, above this power this lever shouldn't have any influence because the P2.5 valves close automatically for the engine to have the best performance. In the engine diagram, you can see these valves closing, so I don't have P2.5 air conditioning.
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There are two things happening when you pull that lever, to the best of my understanding, and only one is depicted on the tablet for the sake of simplicity. One is the P2.5 influence that we discussed above, but the other is the elimination of cabin return mixing air, which cools the P3 air. That's why the lever should not be used in flight, as this would overheat the ducts. That's my understanding of the system, at least.
