HAL Cheetah
| SA 315B Lama | |
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| An SA 315B Lama over Mt. Lauberhorn | |
| Role | General Purpose Helicopter |
| National origin | France |
| Manufacturer | Aérospatiale/Helibras/HAL |
| First flight | 17 March 1969 |
| Introduction | July 1971 |
| Retired | Chilean Army |
| Status | Active limited service |
| Primary user | Indian Air Force |
| Developed from | Aérospatiale Alouette II |
 Footage of SA 315B Lamas performing aerobatic manoeuvres
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Video of Lama operations amongst mountainous terrain
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A Lama performing several utility flights in the Alps
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The Aérospatiale SA 315B Lama is a French single-engined helicopter developed to meet hot and high operational requirements of the Indian Armed Forces. It combines the lighter Aérospatiale Alouette II airframe with Alouette III components and powerplant. The Lama possesses exceptional high altitude performance; on 21 June 1972, the type established a helicopter absolute altitude record of 12,442 m (40,814 ft), a record which remained unbroken as of March 2017.
The helicopters have been built under licence by Hindustan Aeronautics Limited (HAL) in India, known as the Cheetah; HAL later developed an upgraded variant, powered by the Turbomeca TM 333-2M2 engine, which is known as the Cheetal. An armed version, marketed as the Lancer, was also produced by HAL. It was also built under licence by Helibras in Brazil as the Gavião.
The SA 315B Lama was originally designed to meet a Nepalese Army Air Service and Indian Air Force requirement for a rotorcraft capable of undertaking operations at hot and high conditions. Both countries possessed extreme mountain ranges in the form of the Himalayas in which even relatively powerful medium-sized helicopters could not be effectively operated within, thus there was an expressed desire for an aerial vehicle capable of operating in this challenging environment. To achieve the desired performance, Aerospatiale elected to combine elements of two existing popular helicopters in their inventory, the Aérospatiale Alouette II and the Aérospatiale Alouette III to produce a new rotorcraft specialised for high altitude performance. Specifically, the new helicopter, named Lama, was equipped with the Alouette III's Turbomeca Artouste turboshaft powerplant and its dynamic systems, and was furnished with a reinforced version of the Alouette II's airframe.
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