Originally Posted by Spanish;[url=tel:34144700
34144700[/url]]Maybe some of the RVSM equipment is inoperative. That would explain the restriction. Still an "airspace restriction" without telling PAX there's something wrong with the jet.
whilst this is an option, it is pretty unlikely, RVSM equipment is actually incredibly basic; 2 altimeters, an altitude alerting system, an autopilot and a transponder.