121.5 Emergency Locator Transmitter & Mexico
The Mexican government had decided to allow, for a short time longer, US airplanes to fly into Mexican airspace and the country if they still have the old 121.5 ELT installed. The country of Mexico still switched to the new rule of allowing only 406MHz emergency locator transmitters on aircraft that are registered in Mexico. If a USA registered airplane flys into Mexico, it will still be allowed for the time being.
Mexico realizes the vast amount of airplanes that fly in and out of Mexico rm the united states. The US has not mandated the use of 406MHz ELTs so if Mexico were to ban all aircraft that do not have them it would severely impact the revenue from US airplanes. The restriction on the old 121.5 MHz emergency locator transmitters will eventually be upheld by Mexico, but for now it is still legal to fly into Mexico with an old one.