By Doug Cameron 

A senior Pentagon official lashed out at Pratt & Whitney, saying that the United Technologies Corp. unit is failing to meet commitments to cut costs for the engines for the delayed and over-budget F-35 Joint Strike Fighter.

The estimated cost of building the F-35 rose in 2013 after two years of decline, according to new Pentagon figures released Thursday. The report said the forecast price of the advanced jet's engines is rising far faster than for other parts of the jet, which is due to enter combat service next year.

The F-35 has become notorious for being one of the most expensive weapons programs in history. The Pentagon report said the program's anticipated cost, which encompasses the production of 2,443 jets, rose 1.9% from last year's estimate to $398.6 billion, despite years of efforts to trim the price tag.

The Defense Department has focused its cost-cutting efforts increasingly on Pratt, after having improved relations with the F-35's prime contractor, Lockheed Martin Corp., securing lower prices for each batch of new airframes and closing deals far quicker than in the past. Pratt has said it has cut the average cost of providing the jet's single engine by 40% since the program started.

But Lt. Gen. Chris Bogdan, the military official in charge of the program, said the company isn't doing enough. "Pratt is not meeting their commitment. It's as simple as that," he said.

Pratt declined to comment until it had reviewed the latest Pentagon report on the F-35

While the Pentagon has withheld some payments to Pratt as the two sides wrangle over the price of existing and future engine deliveries, Gen. Bogdan said he had limited sanctions since the company is the only supplier.

The U.S. stopped funding a rival engine project led by General Electric Co. in 2011, after GE had poured millions of dollars into an effort to maintain a share of a market estimated to be worth over $100 billion.

Gen. Bogdan said that when faced with single suppliers, it is "difficult to find the right levers and motivation to drive costs down."

Competition is central to the Pentagon's efforts to cut acquisition costs. The Pentagon hired BAE Systems PLC in 2011 to develop an alternative helmet for the F-35 after the original one developed by Rockwell Collins Inc. and Israel's Elbit Systems Ltd. ran into technical problems. It canceled the BAE contract last year and said it had secured a better price with the original vendors.

The new estimate of the F-35's cost were part of the Pentagon's annual update on its most expensive weapons programs.

The estimated cost of operating the F-35 through its expected lifetime from 2015 to 2065 fell by almost 9%, to $1.02 trillion, but the average price of buying the plane over the life of the program rose 2% last year. The total cost of acquiring the planned 2,443 airframes and associated systems rose 1%, while engine costs climbed 6.7%.

The sticker price of new F-35s is lower than the lifetime cost, and Gen. Bogdan said the latest F-35A version cost $112 million apiece. While this was lower than the last batch of jets acquired by the Pentagon, the price wasn't falling as much as in previous years nor as fast as the Pentagon would like.

Part of the increase in the program cost last year came from exchange rate movements. Some 30% of the jet's content is built outside the U.S. The Pentagon, unlike its contractors, is barred from using currency hedges to limit forex losses.

Write to Doug Cameron at doug.cameron@wsj.com

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