A category 2 deficiency for the KC-46A aerial refueling tanker is prevent pilots from taking off in the tanker until the On-Board Inert Gas Generation System (OBIGGS) countdown timer reaches zero.

The jet, which was the twelfth and final of Pease’s new fleet of aerial refuelers, was piloted by a crew from the base. (Courtesy photo/Col. Nelson Perron)
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