Bắc Quan-class frigate

Development
Since the mid-2000s, the Ministry of Defence had been searching for a replacement for the ageing, which had been built in the 1950s and purchased from Gran Altiplano. Dai Hoa approached Chisei, Gyunghwa, and Yamatai seeking to purchase more modern vessels, with the stipulation of a technology transfer arrangement to enable the ships to be produced in Dai Hoa, as well as the right for Dai Hoa to select the systems to be installed in the vessels. Until the 2010 Masukan War, there was little interest in Chisei or Yamatai for such an arrangement.

Following the 2010 Masukan War, the Chiseian government approved the technology transfer arrangement due to Dai Hoa's increased importance for HECO interests in the region. Under the landmark agreement, Nakanishi Aikotan Royal Shipbuilding Company designed and built the first frigate in Chisei while the remaining five frigates were to be built locally by Dai Hoa Technologies Alliance (Marine) at Tuấn Hà. Subsequent maintenance and mid-life retrofitting would be done by Dai Hoa Technologies Alliance. The project was the most expensive military deal Dai Hoa had signed.

Construction of the first vessel, Bắc Quan, began in 2011 in Wanshu and the ship was commissioned in 2016. Local production began with the second ship Bắc Đô, at the Tuấn Hà shipyards. However, severe cost overruns soon ensued due to unprecedented problems with local labour and technology shortages. In an attempt to cut costs, several Chiseian systems were replaced by cheaper Yamataian systems and weapons, requiring costly overhauls to improve compatibility that essentially nullified the cost savings. After the commissioning of the fourth vessel, Hai Phượng, the Ministry of Defence announced that the remaining two ships would be cancelled, and their hulls would be scrapped.

Ships in the class
Six Bắc Quan-class frigates were planned, but only four were commissioned. All four ships are named after major cities in Dai Hoa.