Warbird Information Exchange

http://www.faa.gov/documentLibrary/medi ... C43-17.pdf

Until they went and cancelled that Advisory Circular: http://www.faa.gov/documentLibrary/medi ... 20Memo.pdf

Does anyone know what replaced it, if anything?

The FAA has a newer information system whose database has replaced much of the older AC and it is considered their handbook.
Try here if you haven't already searched the FSIMS-
http://fsims.faa.gov/PICResults.aspx?mo ... lation=all

Interesting! I just got an email from the FAA recommending I use a different system for mobile devices: http://www.faa.gov/mobile/

That's where I found the ACs.

bdk wrote:Interesting! I just got an email from the FAA recommending I use a different system for mobile devices: http://www.faa.gov/mobile/

That's where I found the ACs.

That looks like an app for the same searchable info as on the FAA.GOV website.
The 8900.1 FSIMS is the equivalent of an electronic handbook used by the FAA people. There has been a disappearance of older data that has been incorporated into the 8900.1 FSIMS system. Some has disappeared and not been replaced and some newer stuff is now published in the 8900.1 that doesn't make it to an AC like it would have in the past.