Originally Posted by
Lefthanded_Rock_Thrower
With the commision of the ADS at Newman and the other shortly (MEK and LEO) coming online, it would be a great thing in the West for ADS equipped aircraft be provided with MSAW protection, ATCO's can jump inside my cockpit anytime i'm making a disasterous mistake in IMC, my wife and children would be quite gratefull.
Except that altitude information derived from ADS-B is NOT QNH corrected on our screens, and thus extremely unreliable at altitudes. Hence we are not allowed to use the level reports for vertical separation in CTA below FL130 (flight levels obviously being ok as everything is reference 1013)
So from an MSAW point of view, the precise time we might want to use the level information is when it's at it's most unreliable.