Boeing said Tuesday that it found debris contaminating the fuel tanks of some 737 Max jets that it built in the past year but was unable to deliver to airline customers.
A Boeing official said the debris was discovered in “several” planes but did not give a precise number. Boeing built about 400 undelivered Max jets before it temporarily halted production last month.
The fuel tank debris was discovered during maintenance on parked planes, and Boeing said it immediately made corrections in its production system to prevent a recurrence. Those steps include more inspections before fuel tanks are sealed.
A Boeing spokesman said that the issue would not change the company’s belief that the Federal Aviation Administration will certify the plane to fly again this summer.
An FAA spokesman said the agency knows that Boeing is conducting a voluntary inspection of undelivered Max planes.
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