No person may operate an aircraft in a Category II operation unless there is a second in command of the aircraft.
ACE rules page: Part 135 in plain English
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14 CFR · PART 135
§ 135.111 Second in command required in Category II operations.
Official text · Current as of Oct 19, 2026 · from eCFR
Not legal advice. This is the official text as published in the eCFR, which is updated daily but is not the legal edition. For legal purposes, use the annual Code of Federal Regulations or ask an aviation attorney.