F-35 flights should resume soon: Pentagon official

Lieutenant General Christopher Bogdan, in Australia for talks on the jet, also dismissed any talk of foreign customers backing out of the costly project to build the F-35, known as the Joint Strike Fighter, because of its delays.

If the crack's cause was as straightforward as a foreign object striking the turbine, or a basic manufacturing defect, “I could foresee the airplane back in the air in the next week or two,” Bogdan told reporters in Melbourne.

“If it's more than that then we have to look at what the risk is to the fleet,” he said, adding than a verdict on the cracking's cause was expected “by the end of this week.”

“My opinion is that the airplane will be back flying within a reasonable period of time if this is not a serious problem.”

The Pentagon plans to make 2,443 F-35s for the U.S. military and several hundred others for eight international partners including Australia who have invested in the project, as well as at least two customers, Japan and Israel.

Turkey has followed an Italian decision to delay purchase of the JSF, which has labored under soaring costs and delays.

But Bogdan stressed: “I have no indication whatsoever that any partner is thinking about pulling out of the program at all.

“I have communicated with all our partners and all the (armed) services about what occurred with the grounding,” he said.

“They all understand that, while unfortunate, that it is not an unusual thing to find (that) an engine blade on a newer engine has a crack in it.”

Bogdan said the small crack had been noticed during a routine 50-hour ground inspection and the entire engine had been shipped back to manufacturer Pratt & Whitney for examination.

“One thing we are grateful for is that we found the problem on the ground during a routine inspection and not in the air where it could have been catastrophic, where it could have damaged the airplane,” he said.

All 51 test jets in the U.S. F-35 fleet were grounded and further flights were suspended as a “precautionary measure” Friday after discovery of the crack on a turbine blade in one F-35 engine at Edwards Air Force Base in California.

“I do not anticipate whatsoever that this problem will delay any of the major milestones of the program at all, I just don't see that happening even in the worst-case scenario,” Bogdan said, describing the project as “on course and on schedule.”

He warned that further teething problems were likely, with only 35-40 percent of the test flight program completed. “But we have enough money and enough time in development to take care of those things.”

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