SUBJECT: Radio Aids
Question No. 1

The period of validity of the navigational database is:

[ Total Que.:13 ]
28 days
1 month
determined by the national authority and may be from 28 days to 91 days
91 days
Explaination: The navigation data is updated every 28 days and the FMC contains the current and next 28 days database (this coincides with the ICAO navigation data cycle). The data may be customised for the specific airline operations.