Cabin vertical speed warning
Dougydog asks
Questions; That last acars msg....cabin vertical speed...Does it mean the cabin is going to `over take` the outside ie airplane in a dive or does it mean decompression??
The other way around, that the outside air pressure is going to over-take that of the cabin unless the cabin gets recompressed at a rate unpleasant to the pax. Specifically, it means that the re-compression rate of the cabin is higher than 1800ft/min if cabin pressure intercepts outside pressure upon landing. The pressure intercept is managed by the system automatically based on key inputs, one of them the descent rate of the ac. The warning indicates that the pax are heading for an ear pop.