India’s HAL conducts first flight of hanger based Advanced Light Helicopter


Advanced Light Helicopter flight with 2-segment Main Rotor Blades: The first flight of Advanced Light Helicopter (wheeled version) with segmented Main Rotor Blades (MRBs) and Main Rotor Head (MRH) in pre-cone configuration was carried out in Bengaluru according to an official statement issued by India’s state owned aircraft and helicopter manufacturer Hindustan Aeronautics Limited on Thursday.

The flight test was carried out by Wing Commander Unni Pillai, ED (CTP-RW). The two-segment Main Rotor Blades (MRBs) and pre-cone configuration of Main Rotor Head (MRH) are developed to address the stringent stowage dimension requirement specified by the Indian Navy and to improve the Time Between Overhauls (TBO) life of the Main Gear Box, said R Madhavan, Chairman and Managing Director, HAL in an official statement.

On completion of mandated ground testing of various factors, the prototype helicopter was built with ‘Segmented Pre-Cone MRBs’ and ‘Pre-Cone MRH’. The RTB runs, Ground Resonance test and Clamped Power Ground Run were found to be satisfactory, the HAL said.

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India HAL ALH with segmented main rotor blade

ALH with segmented main rotor blade

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The Indian Navy and Coast Guard are operating ALH for the last 18 years supporting their operations for various missions. However, the ship deck-based operations of ALH have been limited as the storage size required for ALH exceeds the hangar sizes available in Indian Navy ships.

The segmented blade feature reduces the folded length and width of ALH making it compatible with the hangar space available on most Indian Navy ships.

Further, the time required for folding or unfolding operations is reduced, said the aircraft manufacturer.

Arup Chatterjee, HAL’s Director for Engineering and Research and Development, said the project was carried out in the shortest possible time with the support of RCMA and DGQA.

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