Thoughts on Indian Navy’s Next Basic Helicopter Trainer

The US Navy announced Jan 13 that they have selected Leonardo’s light, single-engine TH-119 as its next trainer helicopter. This selection is part of USN’s Advanced Helicopter Training System (AHTS) TH-73A contest, which aims to replace the ageing TH-57B/C Sea Rangers that first entered service in 1969. The TH-119 won over Bell Flight’s light single Bell 407GXi and Airbus Helicopter’s light-twin H135 in what must have been a tightly contested program. The initial $176 million deal for 32 helicopters is part of a total contract value of $648 million for 130 helicopters. Deliveries are expected to start in 2020 and go on through 2024 as per a report.

The TH-119 helicopter (photo by Leonardo)

Out of the three contenders, two are single-engine helicopters (TH-119 and Bell 407GXi) while Airbus H135 is a light twin. The TH-119 and H135 are of comparable maximum gross weight (2850 kg and 2980 kg respectively). The Bell 407GXi is slightly lighter at 2268 kg. The TH73A will be used to train USN, US Marine Corps and US Coast Guard pilots at Naval Air Station Whiting Field, Milton, Florida well into the 2050s.

Few aspects of this selection are notable and provides insights for Indian Navy, scouting for its own Alouette III (Chetak) replacement with 111 Naval Utility Helicopters (NUH):

  • A light single won over other competitors in a program that will provide ab-initio rotary training for the USN, Marine Corps and Coast Guard into 2050. Evidently, the USN left out a seemingly critical qualitative requirement (QR) – number of engines, by keeping the ground open for light-twins.
  • The USN called for a basic trainer that is fully-IFR certified (IFR=Instrument Flight Rules), meaning that the basic trainer should be capable of operating in adverse weather conditions, low visibility and IFR-only airspace where VFR helicopters would remain grounded. Leonardo’s TH-119 is the world’s first single-engine, full IFR certified helicopter (FAA STC awarded Jul 2019); Bell 407GXi is next. The H135 answers to this QR but with a twin-engine solution.
  • Leonardo, an Italian company, will manufacture the TH73A trainer at its Philadelphia-based facility in United States through Federal Aviation Administration (FAA) airworthiness certification. This is a unique combination, deriving much value from either side of the military-civil divide. In India, all military aircraft are certified by CEMILAC (Centre for Military Airworthiness and Certification). Meaningful exchange of knowledge between this agency and civil airworthiness regulator DGCA continues to elude us.
  • All three candidates who had their hat in the USN contest fielded skid-fitted helicopters for what is essentially a naval product. Indian Navy has held wheeled landing gear as an ‘essential’ requirement in the NUH specs. In fact, skid and helideck have come to be mutually exclusive for the IN. This is worth a review.

Most importantly, two vital QRs: number of engines and type of landing gear – seen as holy grail and non-negotiable in the Indian Navy context – were left open by the USN, thereby generating multiple options; enabling better selection, potentially bringing more value to the end user. IFR certification for a basic trainer is another futuristic specification Indian spec-writers could reflect upon.

It is well known that the IN requires a Chetak replacement as of yesterday. With great optimism, all these eggs have been placed in the NUH basket while fresh orders for eight Chetak (Alouette III) have recently been placed on HAL by the IN. We have been beating up the Chetaks since 1960s, much like the USN did with the Sea Rangers. As it seems, we will continue to do so for next 20 years at least.

A Chetak (Alouette III) lands on INS Beas, 1990. Picture by Kaypius.

For the navy, the Chetaks provided a light, deck-friendly solution for many roles, stretching from basic training to urgent attack with torpedoes and depth charges. Yet, flight instructors would agree that basic (ab-initio) training is best achieved on a light, single-engine aircraft. Look around. The legacy HJT-16 (Kiran), HPT-32, latest HTT-40, imported Pilatus PC-7, Alouette III and now the TH-73A – all are single engine aeroplanes / helicopters. That should tell us something about basic trainers. Yet, remarkably, the USN left the field open for light twins.

Basic trainers are aircraft on which a pilot cuts his teeth. It has to have pleasant (Level 1) handling characteristics while serving as a good launchpad for bigger, more complex aircraft. Capability for learning skills like autorotations and practice force landings that determine survivability in a life or death situation is a must. For basic trainers, ability to perform practice full touchdown autorotations without damage or restriction is more essential than an additional engine or wheeled undercarriage. Hand-flying without autopilots, and energy-management skills such as autorotations are fundamental to basic training. These are already on the decline, given the level of redundancy and automation on modern aircraft. If the trainee does not learn this thoroughly during basic training, one can only rely on a ‘miracle on the Hudson’ come judgment day. There can be no guarantees.

TH-119 Cockpit (Picture courtesy Leonardo)

Finding replacements takes decades in the system we have curated at IHQ MoD (Navy). In a scathing critique of IN’s decision to beef up a depleting force level of helicopters by ordering more Chetaks, I had made a brief reference to the TH-119 helicopter. It was simply to draw attention to the availability of modern light singles that are fully IFR-certified even as we continue to fiddle with Chetaks from a bygone era. Indian Navy’s decision to foreclose single-engine and skid-fitted helicopters from its future fleet may come back to bite us when the Helicopter Training School bids goodbye to last of the Chetaks, maybe sometime in 2030 timeframe.

Time to do some crystal ball gazing into how basic training will then pan out. Here are a few possibilities:

  • The IN may decide to replace the Chetaks in HTS with a base variant of NUH. This may offer an arguably inferior ab-initio training solution due some of the challenges mentioned above. NUH contenders such as the Airbus AS565 Panther, Bell 429, Sikorsky S76D or Russian Ka-226 hardly qualify as basic trainers (neither does the NUH program expect them to).
  • Even with the Chetak, today there are binding restrictions on the number of ‘autos’ that can be performed in one sortie. Gone are the days where instructors used to drill trainees with 10-12 autorotations in one training sortie. If the NUH (3-5 tons gross weight, twin-engine) precludes or restricts touchdown autorotations, quality of basic training will suffer. We will likely have more ‘children of the magenta‘, less ‘Sully’.
  • As and when NUH are inducted, older Chetaks will find their way into training squadrons. Some of the eight new Chetaks on order may fill this requirement. This is a short-term solution at best.
  • With the first Indian CDS taking up his responsibilities in the Department of Military Affairs (DMA), one hopes for more ‘jointness’ and economy of effort. Basic flying training was traditionally a joint activity under the aegis of the Indian Air Force. Today, this has splintered into many unrecognizable elements, with each service showing an increasing tendency to pull away into silos. The HAL-made Light Utility Helicopter (LUH) may eventually fill the other two services basic trainer requirement.
  • If and when that happens, the navy may find it convenient, even inescapable, to utilize the LUH for basic training. While it may answer to some of the unique training requirements discussed above, marinization of the LUH and adaptability (read here) for naval training such as deck landing practice and oversea search and rescue (SAR) will have to be looked into.
  • At some point, the IN may well find itself walking into the same old trap of reverse-adapting a helicopter (LUH) designed for IAF/IA to naval purpose. Apart from flying in the face of IN’s stated position that precludes single-engine & skid-fitted helicopters, this may yield a sub-optimal solution for the navy unless factored into plans today (the naval Dhruv still throws up ship-interface challenges).

From the foregoing, it may be evident that sooner or later the IN will have to face some harsh realities. We haven’t thought about basic trainers while framing cases for light and medium multirole helicopters. Simulators fill a crucial gap, but not across the spectrum, particularly for basic training. Due thought has to be given to a naval basic trainer. Definitely one of the best basic trainers, for better or worse, the Chetaks are not going to be around forever. Do we have any plans for an Advanced Helicopter Training System? Maybe the CDS can initiate a joint effort in this direction. If not, the IN may have to either start thinking today; or lean on a non-navalised LUH in due course.

What does not change is the inescapable need for a future basic rotary trainer. Rigid mindset in aspects such as single-engine, wheeled landing gear, etc. may have to make way for more modern specifications (IFR compliance, for example) that meet future requirements while retaining navy-specific features.

To be the best, we have to train with the best. Neither Chetak nor NUH is likely to fit this bill in the medium to long term. The USN example should provoke a healthy debate in the IN, leading to meaningful decisions, even if it means reopening the single versus twin or wheel versus skid debate.

It is 2020. The clock is ticking. Where is India’s AHTS?


This article was first published on on 22 Jan 20. You can access it here.

©KP Sanjeev Kumar, 2020. All rights reserved. I can be reached at or on my Twitter handle @realkaypius. Views are personal. Cover photo from

2 thoughts on “Thoughts on Indian Navy’s Next Basic Helicopter Trainer

  1. All the three services are in the same boat. In the name of jointness hope we are not dumped with a product which does not satisfy anyone. The American fleet is large and every service can afford to place its unique sqrs. However we do not have the same luxury. Do not see a way out of some compromise and cooperation as they call.

  2. Nice article to jog some thinking where it matters
    I hope its read and thought over by IN
    Agree to most regarding single engine for training
    For basic training yes
    But for decks I think twins should be the trainer
    Looking at 119 and 129 combo
    Or 407 and 427 combo
    Etc would be prudent with twins becoming the LUH or NUH for fleet
    And single engines could also be the LUH for AF and Army

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