Originally Posted by
Robbiee
Used to be just "clear of clouds".
FYI: the Part 91 rules got changed around 2014 or so when the Part 135 EMS helicopter rules went through some big changes on minimums.
pre-2014:
https://www.govinfo.gov/content/pkg/...-sec91-155.pdf
post 2014:
https://www.ecfr.gov/current/title-1...55#p-91.155(b)