Originally Posted by
CONF iture
They possibly added the 800 ft RA gear up stuff to avoid to get LDG MEMO at FL390 over the NATs when a fellow is maintaining the same track just 1000 ft below and switches the RA on.
Happened to me some months ago in RVSM and it still triggered the landing memo. And it happened with a new MSN so...
I think Ollie Onion's got it