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A problem that has prevented Boeing Co.'s KC-46A tanker aircraft from transferring fuel to a C-17 transport plane may delay a Pentagon decision approving low-rate production of the new tanker in May, the U.S. Air Force said on Thursday.
"We don't yet know the schedule impact to the planned May Milestone C decision, but the problem is well understood and we don't expect an extended delay," said Air Force spokesman Daryl Mayer.
Mayer said the issue arose during testing of the refueling boom that is used to transfer fuel from the 767-based tanker aircraft to a C-17 transport plane, also built by Boeing.
The issue marks another setback for the Boeing program, which has run into delays due to wiring issues and other problems. However the program's projected cost dropped by $3.5 billion to $48.2 billion in a Pentagon report to Congress.