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777 Photo and/or Graphic Element
NAV Selector
If the switch is pushed in, CDU is visible and the selected CDU generates the ND map.
DSPL CTRL Selector
Normally selected off (ALTN not visible). Display processing is automatically re-configured to compensate for certain system faults.
The ALTN position manually selects an alternate display processing path and is used if the system fails to switch automatically.
Air Data/ATT Selector
Normally selected off (ALTN not visible).