the fc is mounted in reverse , and the yaw is set to 180 in ahrs_orientation but the roll horizion is inverted
The roll horizon displays correctly (when the AHRS_ORIENTATION is rotated by yaw 180°) just like in your picture.
Rolf
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but the roll being inverted here is an issue right?
how to make the roll correct?
i get it now how it works , 
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Great.
For the sake of completeness, however, I must add that there are two types of attitude indicators
The western one is the most common, but if you like, you can change the HUD to Russian Horizon (right-click in the HUD of Missionplanner).
The different presentation has already contributed to real accidents. The best known is probably the crash of the Crossair flight CRX 498, in which the changeover between the representations (among other factors) may have contributed to the crash: https://www.aaiu.ie/sites/default/files/SAIB%20Switzerland%20Accident%20Saab%20340B%20HB-AKK%20Crossair%20Nassenwil%20Zurich%202000-01-10.pdf
Rolf
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