By Chelsey Dulaney and Jon Ostrower 

Spirit AeroSystems Holdings Inc. said Tuesday it agreed to transfer its Tulsa, Okla., wing-part assembly business to Triumph Group Inc. after searching for a buyer for the struggling site for more than a year.

Under the terms of the transfer, which includes both the G650 and G280 Gulfstream wing programs, Spirit will make a $160 million cash payment to Triumph. The transfer carries and estimated loss of $205 million to $235 million for Spirit, but is expected to generate a cash tax benefit of $220 million to $230 million.

The plant fabricates wing parts for Gulfstream Aerospace Corp., a unit of General Dynamics Corp., but has been hurt by nearly a billion dollars in cost overruns. Like Boeing Co., Gulfstream's experience outsourcing the wings to Spirit prompted it to bring production back in-house at its Savannah, Ga., campus for its new G500 and G600 business jets, currently under development.

Triumph executives said Tuesday morning on a call with investors the deal was a "complicated transaction" as both programs had struggled during development and early production and it sought a fair agreement with both Spirit as well as Gulfstream and Israel Aerospace Industries Ltd., which assembles the G280.

The programs will be a "source of future growth" as older Boeing and Gulfstream programs wind down, wrote UBS Investment Research analyst David Strauss.

Triumph estimates the Gulfstream programs will immediately add to per-share earnings and could contribute about $250 million in annual revenue once the deal closes, which is expect at year's end.

The deal's announcement came the same day that Boeing confirmed it would cut production of its 747-8 from 1.5 of the jumbo jets a month to 1.3 starting in September. Both Spirit and Triumph supply major portions of the jet. Triumph said it didn't immediately have an assessment of the cut in production.

Spirit first announced plans to sell the plant, along with another Oklahoma facility, in August 2013 after a strategic review of its operations under Chief Executive Larry Lawson, who took over the previous April.

Meanwhile, Spirit has continued to aggressively cut its internal costs and on Tuesday said it would evaluate the remaining work at its other Tulsa programs. The company builds significant components for Boeing's 737, 747, 777 and 787 jetliners in Oklahoma. Boeing programs accounts for more than 80% of Spirit's annual sales.

"There are a number of factors to take into consideration, including exploring our options within the community and with other constituents who have approached us. We won't rush the evaluation and will provide an update as soon as we are ready," Mr. Lawson said in a statement.

Spirit's stock closed at an all-time high Tuesday at $45.32 per share, up 4.3% or $1.86 during the trading day. Triumph's share rose 23 cents, or 0.3%, to $68.55 per share.

Write to Chelsey Dulaney at Chelsey.Dulaney@wsj.com and Jon Ostrower at jon.ostrower@wsj.com

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