Posted in Web Boeing finds debris in wing fuel tanks of undelivered 737 … February 24, 2020 In the latest of a string of quality control issues, Boeing discovered debris that mechanics left inside the wing fuel tanks of several undelivered 737 MAXs during the aircraft assembly process. https://www.seattletimes.com/business/boeing-aerospace/boeing-finds-debris-in-wing-fuel-tanks-of-parked-737-maxs-orders-all-to-be-inspected/