A trick that mutes a blaring horn when the autopilots on all Boeing models—except the 787—are manually disconnected could potentially cause an entry-into-service delay for the company’s KC-46 Pegasus tanker, a derivative of the 767-2C freighter. In a petition for exemption filed earlier this month, Boeing asked the FAA to relieve a certification requirement associated with the horn until a “design improvement” can be made to the flight control computer in the ...

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