The Indian air force (IAF) has opted for Boeing’s Chinook CH-47F to fulfill its requirement for 15 heavy-lift helicopters.

Boeing emerged as the lowest bidder when life cycle costs were calculated, edging out a proposal for the Russian Mi-26, a source close to the deal says.

“The commercial negotiations with Boeing are expected to begin shortly and the contract negotiation committee will finalize the deal for the Chinook,” the source says.

The Chinook and the Mi-26 were the only two proposals. The IAF already operates four Mi-26s.

According to Boeing officials, the Chinook is capable of handling useful loads up to 24,000 lb. and features a maximum gross weight of up to 50,000 lb.

Chinooks are currently in use by the U.S. Army, U.S. Army Reserve and National Guard and international armed forces. The U.S. Army modernization program calls for 513 Chinooks, which includes a combination of 452 new-build and remanufactured CH-47F aircraft and 61 MH-47G remanufactured aircraft. The CH-47F was certified combat-ready by the U.S. Army and fielded to the first operational unit in July 2007.

In the last few years, the U.S. has won several deals in the Indian defense market, totaling more than $8 billion. These include the $4.1 billion contract for 10 Boeing C-17 Globemaster-III strategic airlift aircraft, $2.1 billion for eight Boeing P-8I maritime patrol aircraft and $962 million for six Lockheed Martin C-130J cargo aircraft. Negotiations are being finalized to acquire six more C-130Js as well as four more P-8Is aircraft.