25nm MSA towers as high as 19,400′ to the east of the field, and 14,800′ to the west. One look at the Jepps and you can see why. This means that to ensure terrain protection your aircraft must not exceed a track error of 1nm. The first problem relates to the terminal area itself. But strangely, at the time of writing there has been radio silence on the issue from both Navigation Services for Mexican Airspace (SENEAM), and the Mexican Federal Civil Aviation Agency (AFAC). IFALPA have just published a new safety bulletin for MMMX/Mexico City Airport, which you can read here. Add to that high altitude operations with a healthy dose of terrain and you begin to get the picture. The issue with MMMX is that the vast majority of procedures became RNAV based back in 2021. This can lead to navigational errors, and a raft of related system failures all of which have potential to ruin your day. There have been several recent reports of loss of GNSS signal in the terminal area at MMMX/Mexico City Airport.
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