Celeb Chopper Pilot Grounded Over Porn Flight

Oral sex doesn't fly with the FAA. TMZ just found out helicopter pilot David Martz's pilot's license has been pulled.

An FAA spokesperson tells us they issued an "emergency revocation" of his license.

A statement from the agency says they reached the decision based on video that, "showed Martz receiving oral sex while flying his helicopter over San Diego." He was flying with a porn star at the time of the incident.

Martz, who's flown rockers Tommy Lee and Slash, has already appealed and there will be a hearing in the next 30 days.