Mexico’s Civil Aviation Federal Agency (AFAC), the regulator that recently replaced civil aviation authority DGAC, has begun performing random ramp checks on all U.S. FAR Part 91 and 135 foreign flights at all of the nation’s airports, according to Universal Weather & Aviation. Cabotage—the transport of passengers or cargo between two locations in the same country by an operator from another country—and illegal charters mostly operated by N-registered Part 91 aircraft are the reasons for the crackdown, Universal said in a blog post last week.

The random ramp checks, which began November 19, basically require the same documentation that is already required for operating into Mexico. That includes, but is not limited to, valid registration, airworthiness, and air operator or air carrier certificates; letter of authorization in the name of and signed by the aircraft owner or operator; Mexican and worldwide insurance policies; current crew medical certificates; and pilots’ licenses with type ratings.

Universal Weather & Aviation said the ramp checks typically take about 30 minutes each.