Sierra

The Sierra-class oceanic patrol corvettes are intended mainly for interception of drug smugglers, Exclusive Economic Zone (EEZ) patrol, and countering terrorism. The class comprises eight ships with the lead ship ARM (Armada Republica Mexicana/Navy of the Republic of Mexico) Sierra (PO-141) commissioned by the Mexican Navy in 2000. Originally, this project was designated Holzinger 2000 because it is a further development of Mexican Navy Holzinger-class ships introduced in the early 1990s. These ships represent modern shipbuilding with an aft flight deck and hangar for one MBB BO-105C helicopter, stealth features and one 57mm Mk3 naval gun in the fore deck to engage air and surface targets. The 57mm Mk3 naval gun with 3P ammunition was accepted for use in the Mexican Navy in April 2003 following sea operational evaluation conducted by ARM Sonora (PO-152) oceanic patrol vessel. The four last ships of the class have received some modifications to improve their overall performance compared with the first four ships of the same class.

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