in the link provided above, Jeppesen NavData has 28day cycle whereas Digital Terminal Charts have 14day cycle Can you provide the reason for varying update cycles

i am aware by the name Terminal charts means airports information and approach plates, SIDs & STARs but what does NavData contain ?


1 Answer 1


Terminal charts are published per a 14-day cycle which is usual in IFR chart circulation.

Jeppesen states on their website that the NavData pack is published according to the 28-day AIRAC cycle.

The NavData pack contains navigational charts, terrain/obstacle data, and data for RNP/LPV.

  • $\begingroup$ I will respectfully disagree. The AIRAC cycle is 28 days, which is a worldwide standard. Jepp chooses to publish charts every 14 days, which allows them to update a chart instead of issuing a NOTAM. However, procedures are updated on the normal AIRAC cycle which includes both the chart and data. $\endgroup$
    – Timbo
    May 27, 2023 at 0:38
  • $\begingroup$ Agree with Timbo. That's an option they chose. Ivanantuns is right too, regarding the service content. You use Digital Terminal Charts on your iPad or a Windows device, and NavData is loaded into FMS. $\endgroup$
    – alQ
    Sep 25, 2023 at 2:44

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