B757 Undifferentiated or Other Model
Aircraft Equipment Problem Critical
Flight Crew Diverted; Flight Crew Landed As Precaution; General Declared Emergency
Aircraft
We got a Cabin Altitude EICAS warning message at FL400 and executed an emergency descent to 10;000 FT per QRH; declared emergency and diverted. Upon initial descent we turned off course 30 degrees and informed ATC of the deviation. Once settled and stable at 10;000 FT we completed appropriate checklists and completed the diversion with no further events.
B757 First Officer experiences a Cabin Altitude EICAS warning message at FL400. An emergency is declared; descent initiated; and a diversion to a suitable airport is planned.