Page 121 - MATRIX MANUAL
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  x QRH 10-8 NON-QRH
ETOPS Significant System
 Messages: INSTR SWITCH
Condition: Both pilots’ ADI and HSI use the same symbol generator source.
  After QRH procedures complete. Contact SOC to update condition and review. Both pilots ADI and HSI use the same symbol generator source (Center).
May continue with concurrence.
 Both pilots ADI and HSI use the same symbol generator source (Center). May continue with concurrence.
 MX procedures that could follow.
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