United States Government Publishing Office publisher pbl distributor dst United States National Archives and Records Administration Office of the Federal Register author aut Government Organization text government publication eng FR Regulatory Information 2015_register executive 2018-02-21 article Rules and Regulations D09002ee1c7f7a350 D09002ee1c7f7a441 United States Department of Transportation originator org United States Government Agency or Subagency United States Federal Aviation Administration originator org United States Government Agency or Subagency We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 787 airplanes. This AD requires a repetitive maintenance task for electrical power deactivation on Model 787 airplanes. This AD was prompted by the determination that a Model 787 airplane that has been powered continuously for 248 days can lose all alternating current (AC) electrical power due to the generator control units (GCUs) simultaneously going into failsafe mode. This condition is caused by a software counter internal to the GCUs that will overflow after 248 days of continuous power. We are issuing this AD to prevent loss of all AC electrical power, which could result in loss of control of the airplane. 80 FR 24789 https://www.govinfo.gov/app/details/FR-2015-05-01/2015-10066 2015-10066 fr01my15-2 RIN 2120-AA64 4910-13-P Docket No. FAA-2015-0936 Directorate Identifier 2015-NM-058-AD Amendment 39-18153 AD 2015-09-07 https://www.govinfo.gov/app/details/FR-2015-05-01/2015-10066 https://www.govinfo.gov/content/pkg/FR-2015-05-01/html/2015-10066.htm https://www.govinfo.gov/content/pkg/FR-2015-05-01/pdf/2015-10066.pdf Air Transportation Aircraft Aviation Safety Incorporation by Reference Safety 3 p. 24789 24791 80 FR 24789 Title 14 Part 39 14 CFR Part 39 RIN 2120-AA64 Airworthiness Directives; The Boeing Company Airplanes; Federal Register Vol. 80, Issue RULE 2015-10066 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 2015-05-01 Docket No. FAA-2015-0936 Directorate Identifier 2015-NM-058-AD Amendment 39-18153 AD 2015-09-07 4910-13-P 2015-10066 Final rule; request for comments.

We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 787 airplanes. This AD requires a repetitive maintenance task for electrical power deactivation on Model 787 airplanes. This AD was prompted by the determination that a Model 787 airplane that has been powered continuously for 248 days can lose all alternating current (AC) electrical power due to the generator control units (GCUs) simultaneously going into failsafe mode. This condition is caused by a software counter internal to the GCUs that will overflow after 248 days of continuous power. We are issuing this AD to prevent loss of all AC electrical power, which could result in loss of control of the airplane.

This AD is effective May 1, 2015. Kelly McGuckin, Aerospace Engineer, Systems and Equipment Branch, ANM-130S, FAA, Seattle Aircraft Certification Office (ACO), 1601 Lind Avenue SW., Renton, WA 98057- 3356; phone: 425-917-6490; fax: 425-917-6590; email: Kelly.McGuckin@faa.gov. Air Transportation Aircraft Aviation Safety Incorporation by Reference Safety Airworthiness Directives: The Boeing Company Airplanes , 9-ANM-Seattle-ACO-AMOC-Requests@faa.gov Kelly.McGuckin@faa.gov http://www.archives.gov/federal-register/cfr/ibr-locations.html http://www.regulations.gov https://www.myboeingfleet.com Vol. 80, no. 84 Office of the Federal Register, National Archives and Records Administration 2015-05-01 continuing daily deposited born digital 436 p. Table of Contents: AE 2.7: GS 4.107: AE 2.106: KF70.A2 https://www.govinfo.gov/app/details/FR-2015-05-01 P0b002ee19884ba5f 0097-6326 0042-1219 0364-1406 769-004-00000-9 000582072 f:fr01my15 https://www.govinfo.gov/app/details/FR-2015-05-01 https://www.govinfo.gov/content/pkg/FR-2015-05-01/pdf/FR-2015-05-01.pdf https://www.govinfo.gov/content/pkg/FR-2015-05-01/xml/FR-2015-05-01.xml fdlp 24779 25205 DGPO 2018-02-21 2024-06-02 FR-2015-05-01 machine generated eng FR FR-2015-05-01 80 84