Why in News

INS Mahendragiri, the sixth of seven Nilgiri-class stealth frigates built under Project 17A, was formally delivered to the Indian Navy on April 30, 2026 at Mazagon Dock Shipbuilders Ltd (MDSL), Mumbai. The ship features 75% indigenous content by value, BrahMos supersonic cruise missiles, MFSTAR active electronically scanned array radar, and MRSAM medium-range surface-to-air missile system — making it one of India’s most capable warships ever commissioned.

Project 17A — Overview

Feature Detail
Programme name Project 17A (P17A) — Nilgiri-class guided missile stealth frigates
Total ships 7 frigates
Builder 1 Mazagon Dock Shipbuilders Ltd (MDSL), Mumbai — 4 ships (lead yard)
Builder 2 Garden Reach Shipbuilders & Engineers (GRSE), Kolkata — 3 ships
Designer Warship Design Bureau (Indian Navy)
Contract signed February 2015
Indigenous content ~75% by value (improved from ~30% in previous P17 Shivalik class)
Previous class Project 17 — Shivalik class (3 frigates, 2010–2012)

Ship-Wise Status (Project 17A)

Ship Builder Status
INS Nilgiri MDSL Commissioned 2024
INS Himgiri MDSL Commissioned 2025
INS Udaygiri MDSL Commissioned 2025
INS Dunagiri GRSE Commissioned 2025
INS Taragiri GRSE Commissioned 2025
INS Mahendragiri MDSL Delivered April 30, 2026
INS Vindhyagiri GRSE Under trials

All ships are named after mountain ranges of India — Nilgiri, Himgiri, Udaygiri, Dunagiri, Taragiri, Mahendragiri (Eastern Ghats, Odisha), Vindhyagiri.

INS Mahendragiri — Technical Specifications

Feature Detail
Classification Guided missile stealth frigate
Displacement ~6,670 tonnes (full load)
Length ~149 metres
Propulsion CODOG (Combined Diesel or Gas)
Speed ~28 knots
Range ~4,500 nautical miles
Crew ~250 officers and sailors

Weapons and Sensors

System Details
BrahMos supersonic cruise missiles Range ~450 km (extended range version); Mach 2.8; anti-ship + land attack
MRSAM (Medium Range Surface to Air Missile) India-Israel co-development; intercepts aircraft, missiles, drones at 70 km range
MFSTAR radar Multi-Function Surveillance and Threat Alert Radar; active phased array; 360° coverage
Torpedo tubes For anti-submarine warfare
CIWS Close-In Weapon System (last-ditch defence)
Helicopter Carries naval helicopters (ASW/ASOR role)

Significance — India’s Indigenous Warship Industry

Strategic Import Substitution

Project 17A represents a generational leap in India’s naval self-reliance:

Parameter P17 (Shivalik, 2010) P17A (Nilgiri, 2024–26)
Indigenous content ~30% ~75%
Radar Foreign (MF-STAR import) India-Israel co-produced
Missiles Imported BrahMos (India-Russia JV) + MRSAM (India-Israel)
Steel Foreign DMR 249A — indigenously developed warship-grade steel (SAIL)
Stealth features Basic Advanced — reduced radar cross-section hull, CODLAG propulsion-reducing acoustics

Make in India — Defence

  • MDSL and GRSE are the backbone of India’s surface warship construction
  • INS Mahendragiri demonstrates India can design and build large complex warships domestically
  • Part of the 10-year indigenous shipbuilding plan that also includes destroyers (P15B), submarines (P75I), and aircraft carriers

The Hindu Editorial Angle — “At Sea: On Project 17A”

The Hindu’s editorial (May 6, 2026) notes that despite 75% indigenous content by value, critical dependencies remain:

  • Certain sensors are still imported
  • Propulsion systems have foreign components
  • Delays in delivery (original delivery dates slipped by 2–3 years) reflect production bottlenecks

The editorial calls for indigenous development of marine gas turbines — currently India’s biggest propulsion gap — and faster integration of indigenous sonar and electronic warfare suites.

UPSC Relevance

Paper Angle
GS3 — Security India’s defence modernisation, naval indigenisation, Project 17A
GS3 — Economy Defence manufacturing, Make in India, PLI for defence
GS2 — Governance MDSL, GRSE as PSUs; Warship Design Bureau; DDP role

Mains Keywords: Project 17A, Nilgiri-class frigate, INS Mahendragiri, BrahMos, MRSAM, MFSTAR, CODOG propulsion, MDSL, GRSE, Warship Design Bureau, Make in India defence, DMR 249A steel, naval indigenisation

Prelims Facts Corner

Item Fact
INS Mahendragiri 6th of 7 Project 17A ships; delivered April 30, 2026; MDSL Mumbai
Project 17A total ships 7 Nilgiri-class frigates
Builders MDSL (4 ships) + GRSE Kolkata (3 ships)
Designer Warship Design Bureau (Indian Navy)
Indigenous content ~75% by value
Propulsion CODOG (Combined Diesel or Gas)
Key weapons BrahMos + MRSAM + MFSTAR
7th ship INS Vindhyagiri (GRSE) — under trials
Named after Mountain ranges of India
Previous class Project 17 Shivalik class (3 ships, 2010–2012)