Carriage of narcotic drugs, marihuana, and depressant or stimulant drugs or substances

This regulation holds Part 135 operators (air taxi and commuter operators) accountable if they knowingly allow their aircraft to be used for illegal drug transportation. It references § 91.19(a), which prohibits carrying narcotic drugs, marijuana, and certain other controlled substances except when authorized by federal or state law (such as for medical transport or law enforcement purposes).

The key word is "knows"—the certificate holder must have actual knowledge that the aircraft is being used for illegal drug operations. If a Part 135 operator is aware their aircraft is being used to transport illegal drugs and allows it anyway, the FAA can suspend or revoke their operating certificate.

This regulation reinforces that Part 135 operators have a responsibility to ensure their aircraft aren't used for criminal activity. It's not about accidental or unknowing involvement, but rather about operators who are complicit in illegal drug transportation operations.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*