"Our test pilots Group Captain (retired) K.K. Venugopal and Group Captain (retired) S. Chakki flew the aircraft for the maiden spin testing at the military airport," said the city-based defence behemoth in a statement.
The aircraft was tested to take two turn spins and subsequently recovering through controls.
Spin testing is a critical aspect of flight testing of any aircraft development programme.
HAL's Aircraft Research and Design Centre (ARDC) had conducted wind tunnel testing and mathematical model analyses to arrive at the spin characteristics of the aircraft, the statement said.
"The study is put to test during the first few moments of spin testing," it added.
According to HAL's Engineering and Research and Development (R&D) director Arup Chatterjee, the test points were met and the spin completion is the last metric which needs to be accomplished before an aircraft enters service.
The project, which began in August 2013 with internal funding, reached spin testing in five years.
The production clearance for the HTT-40 is expected by this year-end, the statement added.
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