The navigation data base of the FMC contains all the information that would normally be obtained from the navigation charts. For instance, you would find navaids, airports, runways, approaches (with constraints, specific features), STARs, SIDs, and company routes. In each aircraft, the FMC has two sets of navigation data, each valid for 28 days. Each of them conforms to a revision cycle that the crew will check and select during the cockpit preparation, usually done by the pilot flying who sets up the FMC. The nav data base is updated by maintenance every 28 days.
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