page_title: Knox-class frigate
section_title: Chi Yang class
hierarchical_section_title: Knox-class frigate / Chi Yang class
caption_attribution_description: 中文（繁體）‎: 停泊於基隆港東五號碼頭的中華民國海軍巡防艦濟陽號（FFG-932）左舷。
context_page_description: Knox-class frigates were United States Navy warships, originally laid down as ocean escorts, but were all redesignated as frigates on 30 June 1975, in the 1975 ship reclassification plan and their hull designation changed from DE to FF.
  Modifications were made to Joseph Hewes and subsequent ships of the class. The primary differences were slightly different arrangement of the "Officer's Country" staterooms with additional staterooms in the 01 level instead of the open deck between the boat decks. The stateroom on the port side under the bridge was designated as a "flag" stateroom, with additional staterooms for flag staff when serving as a flagship. These ships have been referred to as the Joseph Hewes-sub-class
context_section_description: In the 1990s, the US agreed to transfer eight Knox-class frigates to the Republic of China Navy (ROCN). The ROCN, anticipating future difficulties in maintaining the steam plants on these ships, originally contemplated an ambitious plan to replace these plants with diesel engines. However, due to budget considerations and the acquisition of newer ships, this plan is now believed to have been shelved. These frigates were renamed the Chi Yang-class and assigned to the ROCN 168 Patrol Squadron.
  By 2005, the ROCN had removed several systems from the retired Gearing class upgraded World War II-vintage destroyers and transferred them to seven of the Chi Yang class. These systems include SM-1MR Standard missile in box launchers, H-930 modular combat system, and DA-08 air/surface search radar. Each Chi Yang-class frigate has 10 SM-1 missiles installed in two forward twin box launchers on top of the helicopter hangar, and two triple box launchers installed between the stack and the hangar, pointing to port and starboard. Chi Yang (FFG-932) did not receive the upgrade.
  The ASW capability of the Chi Yang class is provided by its SQS-26 bow-mounted sonar, SQS-35(v) VDS, SQR-18(v)1 passive TAS, MD500 ASW helicopter, Mk-16 8-cell Harpoon/ASROC box launcher, and four Mk46 324 mm (12.8 in) torpedoes. While on ASW patrol, the frigate will carry two Harpoon SSMs and six ASROCs in its Mk-16 box launcher.
  There are some speculations that these ships will probably be upgraded with Hsiung Feng III missiles.
caption: Chi Yang class FFG-932
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