Computer Sciences will provide Textron with global IT infrastructure and network support services in a 10-year, $1.1bn (£600m) contract.
Under the deal, CSC will help manage and support Textron's global datacentre and technology help desk and network operations, as well as mainframe and midrange systems, desktops and engineering workstations.
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"We recognise that partnering with best-practice IT suppliers can help us deliver significant business results," said Ken Bohlen, executive vice-president and chief innovation officer at Textron.
"After a thorough review of our IT operations and requirements, it was clear that CSC offered the most compelling options for Textron and for our employees."
Textron manufactures a variety of product, including Cessna aircraft, Bell helicopters and specialty marine and land vehicles, as well as real-time control systems and components for weapons and surveillance.
Under the contract, CSC will help Textron reduce costs by delivering a global, integrated IT infrastructure architecture, providing a consistent user environment and standardized processes across its businesses.
Approximately 250 Textron IT employees will be offered employment by CSC, the statement said.
Linda Rosencrance writes for Computerworld