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HAL's light chopper tested to 20,000 feet, ready for high altitude trial

Success of Light Utility Helicopter opens door to civilian, export markets

Ajai Shukla  |  New Delhi 

Light Utility Helicopter, LUH, HAL
HAL's Light Utility Helicopter. Photo: @HALHQBLR 

Ltd (HAL) has displayed its proficiency in the demanding field of helicopter design by successfully testing its indigenously developed (LUH) to an altitude of six kilometres (almost 20,000 feet).

In an organisation where engineers and technicians still smart over Defence Minister Nirmala Sitharaman's recent statement that was not competent to manufacture the Rafale fighter under licence, there is quiet vindication.

stated on Monday that breaking the six-kilometre barrier was "a critical requirement towards the certification of LUH... With the completion of this milestone, LUH can now undertake high altitude, cold weather trials planned in January 2019".

This will involve operating the LUH in winter from helipads on the Saltoro Ridge that towers above the Glacier. At present, with the decades-old Chetak and Cheetah fleets nearly obsolete, HAL's twin-engine Dhruv Advanced Light Helicopter (ALH) services the Army's Himalayan posts. Once the LUH is certified for operations, it will take on many of these tasks.

Both the Dhruv and LUH are designed to operate at altitudes up to 6.5 kilometres (21,325 feet), a capability that few helicopters have. While selecting a VVIP chopper, the government brought down the altitude requirement to 4.5 kilometres because there was just one chopper that could fly up to even six kilometres.

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Yet, this altitude requirement is essential for the Dhruv and LUH, which must supply provisions to, and evacuate casualties from Glacier posts like Sonam, which, at 20,997 feet, is the highest inhabited spot on the planet.

HAL's chief test pilot, Wing Commander (Retired) Unni Pillai, who made the first Dhruv landing on Sonam, also piloted the LUH during its six-kilometre altitude test along with Wing Commander (Retired) Anil Bhambhani.

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Powering this impressive performance is the Shakti engine, custom-designed by French engine-maker Turbomeca (now Safran) in partnership with The Shakti, which is now built in India by HAL-Safran, powers a successful family of HAL-built helicopters: the Dhruv ALH, the LUH, an armed Dhruv variant called Rudra, and the Light Combat Helicopter (LCH), which is close to being accepted into service.

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Unlike the Dhruv, Rudra and LCH -- all of them large, five-tonne helicopters powered by twin-Shakti engines -- a single Shakti engine powers the three-tonne LUH. Safran markets this engine as the Ardiden 1U, while HAL calls it the Shakti 1U.

With the Army in dire need of 394 light helicopters, the defence ministry decided to meet that requirement through two procurements. To meet immediate requirements, 197 light helicopters would be procured from the international market. Meanwhile, HAL would develop and manufacture 187 indigenous light choppers.

In making the overseas procurement, the National Democratic Alliance (NDA) government decided against a global tender, instead signing an inter-governmental agreement (IGA) with Russia for building the Kamov-226T helicopter in India, in a joint venture with HAL. With that contract still to be signed, the rapid pace of the LUH development gives the government the option to dispense with international procurement and build an all-Indian fleet instead.

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Beyond purely military orders, an ambitious HAL is looking at the civil and export markets as well. "The LUH is being indigenously developed by HAL to meet the requirements of both military and civil operators," announced the company.

Even so, for now, the priority is the military. "HAL has an in-principle order for 187 LUH that includes 126 for and 61 for IAF," stated HAL on Monday.

According to HAL, the LUH "will be capable of flying at 220 kilometres per hour, with a service ceiling of 6.5 kilometres and a range of 350 kilometres with a 400-kilogramme payload... The helicopter, with a glass cockpit, can be deployed for reconnaissance and surveillance roles and as a light transport helicopter".

At present, the LUH is being tested with two prototypes. The first flight took place on September 6, 2016, while the second prototype flew on May 22, 2017. A third prototype is currently being built.

First Published: Mon, December 10 2018. 22:00 IST