8 June 2021 by Phillip JohnstonOn 9 April, Boeing announced that it notified 16 airlines and the U.S. Federal Aviation Administration (FAA) of a potential electrical grounding problems with the backup power control unit, the storage rack the power control unit is mounted in, and the main instrument panel. In response to this announcement, active aircraft were pulled out of service. The FAA released an airworthiness directive describing the problem and its consequences: Degradation of bonds essential for the electrical grounding of equipment, if not addressed, could affect the operation of certain systems, including engine ice protection, and result in …
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