[phumbe]

Looks like forward slip to landing has been in the Private Pilot Practical Test Standards [1] since at least Nov 2011

[1][PDF] https://www.faa.gov/training_testing/testing/test_standards/...

[dbenjamin]

Here's it as a required maneuver in 1995 :)

https://www.faa.gov/documentLibrary/media/Advisory_Circular/...

[crikli]

Huh. I'm wrong then obviously. Wonder if it's never come up as I tend to forward slip on crosswind landings. Don't recall a DPE ever even mentioning slips.