Originally Posted by
oceancrosser
Bring back NDBs! But in reality, all those Aviation Authorities that have been throwing out the ground based NAVAIDS need to have a rethink.
Well i have thought for some time now that the "all-the-eggs-in-one-basket" obsession with doing away with all ground-based aids in favour of "free" GPS/GNSS was going to come back to bite us.
With so many areas of conflict en-route now, a large number of our flights are turning up in the Far East with no ADS-B, unable to accept certain runways with RNP Missed Approach procedures and having to be separated more due lack of other surveillance.
My understanding is once Airbus fleet detect out of tolerance position information, ADS-B is automatically decoupled (or de-latched is a term I've heard used) and cannot be recoupled in flight. Whereas with Boeing types, the system can be manually recoupled once in a stable GNSS reception area.
Can any body comment on the accuracy of that info?