HAL Light Utility Helicopter

Light Utility Helicopter (LUH)
LUH in flight
General information
TypeUtility helicopter
National originIndia
ManufacturerHindustan Aeronautics Limited
DesignerRotary Wing Research and Design Center[1]
StatusLimited series production
Primary usersIndian Army
Number built3 (12 on order)[2][3]
History
Manufactured2013 – present
Introduction date2024 (planned) [4]
First flight6 September 2016[5]

The HAL Light Utility Helicopter (LUH), along with its derivative, Light Observation Helicopter (LOH), was designed and developed by the Rotary Wing Research and Design Center (RWR&DC),[6] one of the R&D sections of Hindustan Aeronautics Limited (HAL), for civilian and military applications. These are intended to replace license-built versions of Aérospatiale SA 315B Lama (designated Cheetah) and Aérospatiale Alouette III (designated Chetak) in service with the Indian Army and the Indian Air Force.

Development

[edit]

Background

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The first seven-seater French-origin Alouette III helicopters were introduced by the IAF in 1962. A year later, in 1965, the HAL gave the IAF its first Alouette III, named HAL Chetak, produced under licence. Furthermore, HAL and France struck a contract in 1970 for the local production of the five-seater SA-315B Lama helicopters, which were later christened HAL Cheetah when they were delivered to the Indian Air Force in 1976.[7]

During the 1990s and the 2000s, the procurement of a modern successor to the aging HAL Cheetah and HAL Chetak helicopters of the Indian Army and the Indian Air Force had been recognised as an impending need.[8] Multiple attempts at establishing a competitive tendering programme; one such effort specified a total of 197 utility helicopters for the Indian Army, 60 of which were to be directly purchased and the remaining 137 to be produced under licence by Indian aerospace company Hindustan Aeronautics Limited (HAL).[8] However, this tender, in which the Eurocopter Fennec appeared to be the frontrunner against the rival Bell 407, eventually ended up being cancelled in response to allegations of irregularities in the selection process; Eurocopter was subsequently investigated and exonerated of any wrongdoing.[9][10] Consequently, new safeguards were implemented to ensure impartiality and the replacement effort was subsequently restarted.[8]

During July 2008, the Government of India circulated a request for proposals (RFP) to various helicopter companies, including AgustaWestland, Bell Helicopter, Eurocopter, Kamov and Sikorsky, for a fleet of 197 light utility helicopters to be purchased in a fly-away condition directly from the manufacturer in order to speed up their delivery.[8] Intended for military purposes, the potential contract was valued as a maximum of $750 million, of which 30 per cent was required to be invested within India under the government's policy of industrial offsets; HAL was also specified as to provide domestic maintenance activities for the fleet, who were reportedly also keen to manufacture further examples locally and further develop the selected type.[8] It had been initially hoped that trials would begin in 2009 and that helicopter deliveries could commence as early as 2010.[8][9]

By late 2008, Bell had announced its decision not to participate despite earlier considerations on offering a variant of their Bell 407 helicopter; according to Bell, the high offset requirements had made any bid less feasible and thus the company chose to withdraw from the Indian military market.[9] Rival firm Russian Helicopters, submitting its Kamov Ka-226T, was another major competitor for the competition.[11] Shortly after the selection of the Ka-226T to meet the requirement, during December 2015, an agreement was signed for the creation of a joint venture between Rostec, Russian Helicopters and HAL to manufacture the Ka-226T at a new factory to be built at Tumakuru, India.[12] Meanwhile, HAL, which had long held ambitions to design and produce such an aircraft, sought to establish a partnership with a Western manufacturer with considerable technical knowhow in the field; reportedly, Eurocopter were viewed as being the favourite, having already worked with HAL for decades on previous ventures, such as the Chetak and Cheetal that were being replaced.[13] However, the deal did not proceed as per reports in November 2023 and the entire requirement of light helicopters is expected to be fulfilled by indigenous designs.[7][14]

As of 2023, the Armed Forces plans to retire its fleet of around 400 HAL Chetak and Cheetah from 2027 onwards and is planning to replace them with the modern LUH. The Army has a deficiency of the light helicopters. There are around 190 units of these helicopters of which at least 25 are in MRO at HAL. This is down from 246 units in count. In fact, around 134 of the helicopters are about 30 to 50 years old and are nearing the end of its Total Technical Life (TTL). Also, Air Force operates 120 of these helicopters including the 18 of newer Cheetal variant. However, the first batch of the older helicopters has been retired already.[7][15]

Project launch

[edit]
Light Utility Helicopter mock-up at Aero India 2011

During February 2009, India's defence ministry approved HAL's proposal to enter the design phase on an indigenous design that could potentially meet the requirements of the competition, as well to explore partnership arrangements.[16] HAL promptly performed preliminary design studies on a prospective 3-tonne light helicopter, powered by a single HAL/Turbomeca Shakti turboshaft engine and possessing a range of up to 500 km (270 nm) and a payload capacity of up to 500 kg (1,100 lb). In March 2010, HAL announced that it had decided to proceed on the LUH project alone, without any international partner participating in its development.[17]

In February 2011, HAL unveiled a full-sized mockup of its LUH design.[18] At this point, the design of the LUH was officially frozen, but some elements, such as the powerplant, were yet to be selected for the type; additionally, the first prototype was anticipated to be constructed by the end of 2012 and the first flight was scheduled to occur during 2013.[18] By early November 2012, the bottom structure assembly of the LUH ground test vehicle had been completed. According to HAL, the manufacturing jigs, which are of a modular and gaugeless design, consisting of five assembly jigs and a coupling jig, had been developed and validated using Computer Aided Measurement System (CAMS) to establish high accuracy and stability, which produces smooth and flawless 'First off' structure build.[19]

HAL test pilot Wing Commander (retired) Unni K. Pillai and Director General of Army Aviation Corps Lt Gen AK Suri with LUH.

In March 2014, HAL promoted its LUH's capabilities as a civilian multirole helicopter, noting its ability to carry up to six passengers in an appropriate configuration.[20]

Test programme

[edit]

Following repeated delays to the type's first flight, on 6 September 2016, the first prototype LUH PT-1 (ZG4620) conduct its maiden flight outside HAL's manufacturing facility at Bangalore.[5][21] The maiden flight, which was reportedly flown without any issues, marked the commencement of the flight test phase of development.[22]

On 14 February 2017, the first prototype performed an aerobatic display in front of members of the general public in Aero India 2017.[23] Based on the feedback from the first prototype, a more refined second prototype performed its first flight on 22 May 2017.[24][25]

The LUH flew at 6 km altitude Envelope Expansion Test at Bengaluru, a critical certification requirement, in December 2018.[26] Subsequently, on 14 December 2018, the third prototype PT-3 had its maiden flight.[27] In 2018, the LUH finished hot weather trials at Nagpur. Testing at sea-level altitudes was completed at Chennai in 2018 and at Puducherry in 2019.[28]

Final test flight of Army Acceptance Trial on 7 October 2021.
DG, Indian Coast Guard, V S Pathania, undertook his maiden sortie (45 minutes) in the indigenous LUH at HAL facility in Bengaluru.

In January 2019, the LUH successfully completed cold weather trials.[29] The LUH undertook successful high altitude hot weather trials between 24 August and 2 September 2019.[28] By 7 February 2020, three prototypes had cumulatively performed over 550 flights.[30] On 7 February 2020, the LUH received its Initial Operational Clearance (IOC) from the Ministry of Defence's (MoD) department of Defence Research and Development.[31][32]

The Indian Army has requested a final demonstration trial prior to the LUH goes into mass production. HAL announced the completion of the final demonstration trial on 9 September 2020, which involved envelope expansion, performance, flying qualities, payload and landing capabilities at the highest altitudes of Siachen Glacier.[33] The Final Operational Clearance (FOC) is planned for 2021, following tests focused on its automatic flight control system (AFCS).[34]

During an official visit on 7 October 2021, Director General of Army Aviation Corps Lt Gen AK Suri flew the final test sortie in Light Utility Helicopter which successfully completed the Army Acceptance Trial. HAL LUH is now ready for induction by the Indian Armed Forces.[35] From August 2022, HAL will start flight trial of limited series production (LSP) platform.[36]

The Indian Coast Guard Director General V S Pathania lead a delegation of officials to Helicopter Division of HAL, during which he undertook a 45 minute sortie in LUH. ICG is evaluating replacement of Chetak helicopters in fleet with the LUH.[37]

By 2021, All certification activities like Ground testing, Ground Test Vehicle endurance runs, system testing, Flight testing including hot weather trials, cold weather trials, sea level trials and hot weather high altitude trials was completed and the helicopter design met all the Preliminary Joint Services Qualitative Requirements (PJSQR) of the Armed Forces.[38]

Manufacturing

[edit]

While limited series production (LSP) will be completed from Bengaluru, HAL intends to perform mass production of the LUH at its new helicopter manufacturing complex at Tumakur that will have the capacity to produce helicopters of 3 ton to 12 ton category. The Tumakur assembly line will complete around 30 LUHs per year by 2019–2020; upon enacting Phase II, which will take another three-four years, production would be ramped up to 60 helicopters per year from 2023.[21][39]

The Army variant of LUH received the Initial Operational Clearance (IOC) from Centre for Military Airworthiness and Certification (CEMILAC) in the presence of Defence Minister Rajnath Singh at Aero India 2021 on 5 February 2021.[38]

Limited Series Production LUH being shown to Air Marshal B Manikantan.

The Tumakur assembly line will become fully operational from March 2022.[40] As per a government report from the Rajya Sabha, the Army and IAF will get two LSP each from 2022-23. After that HAL will start rolling out series production (SP) variants.[41] The gearbox was developed by Microtec company located in Hyderabad, while the ring gear is built by Shanti Gears and transmission by HAL. Avionics hardware is supplied by Chennai based Data patterns and HAL worked on the software. With supplies from many other Indian companies, HAL plans to take the indigenous content to over 60 percent.[42]

The Ministry of Defence placed an initial order of 12 Light Utility Helicopters out of which 6 are for Indian Army and another 6 for the Indian Air Force. The Defence Acquisition Council (DAC) on 2 November 2021 approved purchase of 12 Limited Series Production (LSP) variant of LUH. The Indian Armed Forces will purchase 175-400 production variant helicopters.[43][40] The 12 LSP aircraft is expected to cost ₹1,500 crore (equivalent to ₹17 billion or US$200 million in 2023). The delivery which was expected to begin in August 2022 was delayed due to issues with the certification of its autopilot system.[7][15]

The delivery of LSP variants is expected from December 2024 after the delay. As of November 2023, the Army also plans to place an initial order worth ₹45,000 crore (US$5.4 billion) for over 90 helicopters and has a total requirement of around 250 helicopters.[44] As of November 2023 a full fledged order for the three branches of Armed Forces is expected to be finalized within the next 18-20 months, with deliveries projected to commence from 2026 onward.[7][14]

In September 2024, a report by The Hindu confirmed that the Army has a requirement of 225 units of LUH and a deal of 110 units is in the cost negotiation stage.[45]

Design

[edit]

The HAL Light Utility Helicopter (LUH) is a 3-tonne class highly agile new generation light helicopter. According to HAL, it possesses a cruise speed of 235 km/h, maximum speed of 260 km/h, service ceiling of up to 6.5 km, a range of 350 km with maximum take-off weight of 3.12 tonne and an empty weight of 1.91 tonne.[18] The LUH will be capable of accommodating a maximum of two pilots and six passengers, all of which shall be seated on crash-worthy seats; externally, it is capable of carrying cargoes of up to 1 tonne under-slung. LUH with glass cockpit[46] will be able to undertake various missions, including emergency medical services (EMS), troop transport, utility, search and rescue (S&R), VVIP, aerial reconnaissance and surveillance missions.[18][22]

LUH is powered by a single 750 KW rated Shakti-1U turboshaft engine derived from Safran Ardiden, co-developed by HAL and Turbomeca.[47] It supports dual channel Full Authority Digital Engine Control (FADEC) system along with backup fuel control system. The helicopter will be equipped with a glass cockpit featuring a Smart Cockpit Display System (SCDS) along with a skid-based landing gear arrangement.[18] LUH is the only helicopter in the 3 ton class to have foldable rotors.[42] HAL also has HTSE-1200 under development to replace Shakti-1U engines with an indigenous solution.[48]

LUH is equipped with Smart Cockpit Display System (Glass Cockpit), state-of-the-art HUMS (Health & Usage Monitoring System).[38]

HAL on 20 October 2022, awarded the contract for design and development of night vision goggles for LUH to MKU. It will be powered by Generation 3 (GEN III) technology.[49] The development will be handled by Netro Optronics division at MKU.[50]

Operators

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Military operators

[edit]
 India

Civil operators

[edit]
  • Vman Aviation : 5 planned.[52]

Potential operators

[edit]
 Argentina

Specifications

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Data from Jane's All the World's Aircraft,[55] HAL[56]

General characteristics

  • Crew: 2
  • Capacity: 6 passengers
  • Length: 11.49 m (37 ft 8.25 in)
  • Height: 3.38 m (11 ft 1 in) up to the top of the tailfin
  • Empty weight: 1,910 kg (4,211 lb)
  • Max takeoff weight: 3,150 kg (6,945 lb)
  • Powerplant: 1 × HAL/Turbomeca Shakti-1U[57] turboshaft engine, 1,058 kW (1,419 hp) Maximum power output & 912 kilowatts (1,223 shp) continuous power output.[58]
  • Main rotor diameter: 11.6 m (38 ft 0.75 in)

Performance

  • Maximum speed: 235 km/h (146 mph, 127 kn) at Sea-level
  • Never exceed speed: 259 km/h (161 mph, 140 kn)
  • Range: 350 km (217 mi, 189 nmi) with a 500 Kg Payload
  • Ferry range: 500 km (310 mi, 270 nmi) on Internal Fuel
  • Service ceiling: 6,500 m (21,300 ft)
  • Rate of climb: 6.66 m/s (1,426 ft/min)

See also

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Related development

Aircraft of comparable role, configuration, and era

Related lists

References

[edit]
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