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QRH 11-3 NON-QRH
ETOPS Significant System
Messages: L IRS DC FAIL R IRS DC FAIL C IRS DC FAIL
Condition: IRS backup DC power is failed.
After QRH procedures complete. Contact SOC to update condition and review. IRS backup DC power has failed. May continue with concurrence.
NOTE: Loss of DC backup power to all three IRSs can indicate that the hot battery bus is unpowered
and the APU is not available.
After QRH procedures complete. Contact SOC to update condition and review. IRS backup DC power has failed. May continue with concurrence.
MX procedures that could follow.