The Nilgiri-class frigates were updated versions of the Leander class, designed and built for the Indian Navy by Mazagon Dock Limited in Mumbai.

Improved versions of the Signaal search radar continues to be fitted in later classes of Indian Navy ships.

[2] The Seacats were later replaced by Russian AK-230 twin 30mm anti-aircraft guns, and the Limbo by ILAS 324 mm triple torpedo tubes.

This re-design was done indigenously by the Indian Navy and gave it much needed experience and confidence in ship-design and modification.

They were also fitted with an indigenous ASW fire control action information system which was a first for the Indian electronics industry.