Automatic Reversion to Pitch Hold Mode
Several situations can occur while VNAV Mode is active which cause the AFCS to revert to Pitch Hold Mode:
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Vertical deviation exceeds 200 feet during an overspeed condition.
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Vertical deviation becomes invalid (the Deviation Indicator is removed from the PFD).
Following a reversion to Pitch Hold Mode, VNAV Mode and the appropriate altitude capture mode become armed to allow for possible profile recapture.