|Publication(s) and related information
||Boeing Alert Requirements Bulletin 747-21A2577 RB, Revision 2, dated February 10, 2023. For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110 SK57, Seal Beach, CA 90740-5600; telephone 562-797-1717; internet myboeingfleet[dot]com. You may view this referenced service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216thSt., Des Moines, WA. For information on the availability of this material at the FAA, call 206-231-3195.