FAA Part 91

[ASK-13]

What are the currency requirements to operate as P.I.C. in Part 91 operations on large jet aircraft?

[ahwalk01]

The aircraft makes no difference. It comes from 14 CFR 61. Part 56.

14 CFR § 61.57 - Recent flight experience: Pilot in command. | Electronic Code of Federal Regulations (e-CFR) | US Law | LII / Legal Information Institute (cornell.edu)

[340drvr]

Continues on to 61.58, specific for turbojet and/or two-pilot aircraft:
14 CFR § 61.58 - Pilot-in-command proficiency check: Operation of an aircraft that requires more than one pilot flight crewmember or is turbojet-powered. | Electronic Code of Federal Regulations (e-CFR) | US Law | LII / Legal Information Institute (cornell.edu)