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Procedure to ensure the accuracy of navigation data

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Procedure to ensure the accuracy of navigation data

Old 25th Aug 2023, 03:19
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Procedure to ensure the accuracy of navigation data

Operators and pilots should establish the procedure if the AIRAC cycle will change during the flight.

I would like to know how the airline establishes the procedure in AOM, which database should I choose, either can be used as long as I can confirm the accuracy of the data by comparing to the paper.

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Old 26th Aug 2023, 20:17
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AIRAC cycle changes on Thursdays every 28 days (4 weeks), each country has a different time for when the new charts become effective. In the US the switchover time is 09:00Z.
Each airline will establish their own switchover policy, to ensure the charts are in effect, this procedure should be included in the airline's basic operations manual.
It is not possible (Boeing Pegasus FMS) to perform the switchover in the air, so in the case the AIRAC change will occur while in the air, best practice would be to takeoff with the old database active and perform the switchover after landing. Any STAR and/or IAP programmed into the FMS should (always) be verified with the appropriate effective chart (EFB or paper).
The reason the switchover cannot be performed in the air is because switching databases could clear the Routes (1 and 2) already programmed into the FMS.
An FMS CDU message of "Nav Data Out of Date" may be issued should the switchover not be performed in a timely fashion.
Again, this applies to Boeing FMS systems other manufacturers' procedures may differ.
Please consult with your training manager or chief pilot for airline specific policies. Don't be afraid to ask, it's better to ask a seemingly bad question than to remain confused.
Hint: Always check the aircraft clock (time/date) to ensure it is correct.
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Old 27th Aug 2023, 00:50
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In my experience it is a fairly simple statement in the Ops Manual to the effect that "the navigation database that is current at the commencement of the flight shall be used; the database must not be changed during flight".

Comparing to paper is not that easy nowadays with EFB's in widespread use. Even when there were paper charts it was not a quick or simple process.
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