The Signal from Dundigal: What AMCA's RCS TestingCould Reveal About India's Fifth-Generation Fighter

By Kashetty Sai Kiran Editorial Director, Technology & Al Innovation, DKBwBHAVYA

A few weeks ago, satellite imagery showing what appears to be a full-scale AMCA airframe at DRDO's ORANGE facility in Dundigal began circulating across India's defence community. For many, it was simply another update from a fighter programme that still appears years away from entering service.

For others, it raised a more interesting question. Why is a full-scale engineering airframe already visible at one of India's specialised radar cross-section evaluation facilities when the aircraft's first flight is still expected around 2029? The image itself does not reveal classified timelines. It does not confirm an accelerated schedule. Nor does it tell us when the Advanced Medium Combat Aircraft (AMCA) will eventually enter service with the Indian Air Force.

What it does provide is a rare glimpse into a phase of development that normally receives far less public attention than prototype rollouts or maiden flights. Sometimes the most revealing milestones in an aerospace programme happen long before an aircraft leaves the ground.

Why Defence Observers Noticed the Dundigal Image?

The significance of the recent imagery lies largely in where it was taken. The facility in question is DRDO's Outdoor Radar Cross Section Evaluation facility, commonly known as ORANGE, located near Dundigal in Hyderabad. The facility plays an important role in evaluating how detectable aircraft and other platforms appear to radar systems.

For a stealth aircraft program, that matters enormously.

Unlike conventional fighters, stealth aircraft are designed around reducing radar visibility from the very beginning. Engineers spend years refining airframe geometry, surface alignment, materials and internal layouts to minimize radar reflections. Verifying whether those design choices work in the real world requires extensive testing long before a prototype takes flight.

According to satellite imagery analysis reported by defence publications, the structure observed at ORANGE appears to be a full-scale AMCA engineering airframe rather than a flight-ready prototype. Even so, the presence of such a model suggests that parts of the programme have moved beyond digital simulations and entered physical validation stages. That alone makes the sighting noteworthy.

A Programme Still Years From Flight:

The AMCA remains one of India's most ambitious aerospace projects. Designed by the Aeronautical Development Agency (ADA), the aircraft is expected to integrate low-observable characteristics, internal weapons bays, advanced avionics, sensor fusion and next-generation electronic warfare systems. If successful, it would become India's first indigenous fifth-generation fighter aircraft.

Publicly stated timelines remain broadly consistent.

Milestone	Public Timeline
CCS Approval	2024
Programme Execution Approval	2025
Prototype Assembly Late	2027
Prototype Rollout	2028
First Flight Around	2029
Development & Testing	2029-2034
Induction	2029-2034 Mid-2030s

Based on official statements from ADA and DRDO leadership, none of these milestones have changed. This is worth emphasising because discussions surrounding the Dundigal imagery have occasionally drifted toward the assumption that the programme is suddenly ahead of schedule. At least from publicly available information, there is no evidence supporting that conclusion. What the imagery does suggest is that one of the programme's most technically demanding areas is actively progressing.

Puttaparthi, Dundigal and the Question Nobody Expected:

Another reason the Dundigal sighting attracted attention was timing. In May 2026, the foundation stone was laid for the AMCA Aircraft Integration and Flight Testing Complex at Puttaparthi in Andhra Pradesh. The project was presented as a major future hub for aircraft integration, validation, certification and flight-testing activities connected to the AMCA programme.

Naturally, much of the public conversation surrounding future testing activities became associated with Puttaparthi. Then came the imagery from Dundigal. At first glance, the two developments appear contradictory. They are not. Puttaparthi represents infrastructure that is being built for future stages of the programme.

Dundigal represents infrastructure that already exists. One facility is under development. The other is already capable of supporting specialised radar-signature evaluation work. Seen together, the two developments suggest something quite straightforward: different parts of the programme are moving forward simultaneously. The significance of the Dundigal image may therefore have less to do with location and more to do with timing. It offers evidence that certain forms of validation work are already underway while larger testing ecosystems continue to take shape elsewhere.

How Other Stealth Aircraft Programmes Approached This Stage?

The appearance of a full-scale engineering model several years before a planned first flight is not unusual in the world of stealth aircraft development.

The F-22 Raptor and F-35 Lightning II both underwent extensive radar-signature evaluation before prototype flights occurred. Engineering models and specialised test articles were used to identify design issues early, when modifications were still practical and affordable. The same logic continues to influence modern stealth programmes around the world.

Radar cross-section testing is not the final stage of development. In many cases, it is one of the foundations upon which later stages depend. That context matters because it helps place the Dundigal sighting in perspective. Rather than indicating an extraordinary deviation from the published timeline, it may simply reflect the kind of methodical progression expected from a programme attempting to develop a fifth-generation aircraft.

Does This Change Anything?

For now, probably not. The official roadmap remains unchanged. Rollout targets remain unchanged. First-flight targets remain unchanged. At the same time, it would be inaccurate to dismiss the sighting as meaningless. Large defense programs rarely reveal their progress through dramatic announcements alone.

More often, progress becomes visible through small indicators: a new facility, a completed test article, an infrastructure project, a procurement decision or an engineering milestone that attracts attention only within specialist circles. The Dundigal image belongs in that category. It does not tell us when AMCA will fly. It does not tell us whether induction dates will move forward.

What it does indicate is that important work related to low-observable design appears to be progressing through increasingly mature stages of evaluation. For a programme as complex as AMCA, that is a signal worth paying attention to.

Whether the timeline ultimately changes remains to be seen. What seems increasingly clear, however, is that India's fifth-generation fighter programme is steadily advancing through the long and often invisible process that precedes a maiden flight. By the time the first prototype finally rolls out, many of the most important decisions shaping the aircraft's future may already have been made behind the walls of facilities like ORANGE.

References & Research Inputs

1. Defence News & IDRW reports on AMCA at Dundigal

2. ADA and DRDO official leadership statements on AMCA progress

3. Deccan Herald report on AMCA testing facility at Puttaparthi

4. Public documentation on Lockheed Martin F-22 Raptor stealth development

5. Public documentation on Lockheed Martin F-35 Lightning II stealth-testing methodology

6. Public information on Global Combat Air Programme / Tempest programme