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In September, misdrilled holes were discovered in the 737 MAX aft pressure bulkhead, the domed fuselage cap that seals the rear of the passenger cabin and is installed at Spirit.

He discovered further drilling mistakes when he observed a mechanic performing an unauthorized rework on another section of the aft pressure bulkhead.

In August, it was announced that holes in 737 MAX aft bulkheads were improperly drilled — potentially affecting cabin pressure.

Boeing reports defects in the aft pressure bulkhead, assembled by Spirit.

In September, after misdrilled holes were discovered in the aft pressure bulkhead installed at Spirit, the CEO told Wall Street analysts quality checks had been stepped up.