Page 50 - MATRIX MANUAL HTML

x QRH 6-1 NON-QRH
ETOPS Significant System
Messages: L AC BUS OFF R AC BUS OFF
OF
Condition:
.
The AC bus is not powered.
After QRH procedures complete. Contact SOC to update condition. Result of procedure May result in a single AC bus. which degrades the aircraft to a single LRN.
If both AC buses inop..Electrical source is HDG Divert. May have to leave RVSM.
Result of procedure may indicate that one or more Auto Pilot systems have failed. Alternate auto pilot selection is required. The reason for the failure is unknown, so flight into icing conditions may result in some erroneous flight instrument indications
If all autopilots inop do not enter ETOPS. If all inop past EEP may continue with concurrence taking into account RVSM.
MX procedures that could follow.