I have been trying to interpret Type Certificate Data Sheets and am coming up short on how to understand some of the dates listed. For example, here is the TCDS for the new Citation Longitude:
How is one to interpret these dates? Did the type certificate get issued in 2020 or 2019? The Textron Aviation website has a news release in September that claims certification occurred in 2019; so is the 2020 date specific to the TCDS being released, even though FAA approval occurred in 2019?
Also, how does this related to the Revision numbers? Does the 2020 date refer to Revision 4 and the 2019 date refer to a different revision? I can't seem to find the earlier revisions on the FAA website either, so I am not sure whether they even exist as official/released FAA documents.