Established in 2003 at Isabela in Puerto Rico, IASI is a 51:49 Joint Venture between Pratt & Whitney and Cyient.
The company provides aerospace defence design, development and related services, primarily to United Technologies and its business units, Cyient said in a statement.
The closing of the transaction is subject to regulatory approvals and customary closing conditions, it said.
"We continue to embark on the journey towards realisation of our 'design-build-maintain' strategy. To enable greater focus on the strategy, we have been exiting the non-core businesses," Cyient Limited Chief Executive Officer and Managing Director Krishna Bodanapu said.
"This divestment is a step in the right direction and will aid us in becoming more focused striding towards achieving our vision. We will continue to evaluate and rebalance our business portfolio," he said.