Pratt halted F-35 engine shipments in May over titanium

United Technologies Corp's Pratt & Whitney unit briefly suspended delivery of the engine for the F-35 Joint Strike Fighter jet in May because of questions about titanium provided to a parts supplier.

Pratt said on Friday it discovered conflicting documentation in late May that raised questions about the origin of the titanium, which was also used in parts for engines made by its Pratt & Whitney Canada division. The Lockheed Martin Corp F-35 strike fighter is the Pentagon's costliest weapons program.

Pratt determined very quickly that the material did not pose a flight safety risk, company spokesman Matthew Bates said in an emailed statement.

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