All the 20 or so height callouts are programmed to suit the customer airline's needs, Mr "Flyer"
The "Twenty Five Hundred" callout can also be "Radio Altimeter". I believe these two have become more popular in recent times because they have been known to save aircraft... This callout is like a "heads up" alert for those who have found themselves closer to the ground than they thought they were. In some cases, it may provide a warning sooner than a full GPWS warning.
Hope this helps.
Regards.
Q.
Problems with PMDG?
