FMC Source Select Switch

BOTH ON L

  • Selects left FMC for all FMC operations
  • Right map will annunciate "FMC L."

NORMAL

  • Left FMC controls CDUs and provides input to the autothrottle system
  • Right FMC operates in synchronization with left FMC
  • Maps display composite information from both FMCs.

BOTH ON R

  • Selects right FMC for all FMC operations
  • Left map will annunciate "FMC R."

NOTE

Moving the Source Select Switch will cause LNAV and VNAV to disengage.

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