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Vnav Issues With Sp1 300Er

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At the moment i have only tested this with 300er. But sometimes, VNAV will not catch right. The bird start to descent to set FL. Then i'm a littlebit above of VNAV path. So may be 500-600ft. Now ATC gives me a DCT, VNAVN will be calculated new. VNAV path jumps down do offset to -2000ft. OK, no problem set speedbrk. But then happens: The bird hold descent and speed encrease. Faster and faster. I set VS of -3500ft. Nothing happens and after a while the bird start slowly with descent.


Sometimes the nose is goeing up and down and start oscillating... and after shorttime it starts to descent...


CI was 12, calculated by PFPX.

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