Airworthiness Directive · Amendment 39-17436 · Electrical power
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 787-8 airplanes, certificated in any category; as identified in Boeing Alert Service Bulletin B787-81205-SB500003-00, Issue 001, dated April 19, 2013.
We are superseding an existing airworthiness directive (AD) for The Boeing Company Model 787-8 airplanes. That AD currently requires modification of the battery system, or other actions. This AD requires installing main and auxiliary power unit (APU) battery enclosures and environmental control system (ECS) ducts; and replacing the main battery, APU battery, and their respective battery chargers. This AD also requires revising the maintenance program to include an airworthiness limitation. This AD also revises the applicability by removing airplanes on which these changes have been incorporated in production prior to delivery. This AD was prompted by recent incidents involving lithium ion battery failures that resulted in release of flammable electrolytes, heat damage, and smoke on two Model 787-8 airplanes. We are issuing this AD to minimize the occurrence of battery cell failures and propagation of such failures to other cells and to contain any flammable electrolytes, heat, and smoke released during a battery thermal event in order to prevent damage to critical systems and structures and the potential for fire in the electronics equipment bays.
Before further flight: Install main battery and auxiliary power unit (APU) battery enclosures and environmental control system (ECS) ducts; and replace the main battery, APU battery, and their respective battery chargers; in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin B787-81205-SB500003-00, Issue 001, dated April 19, 2013.
Before further flight: Revise the maintenance program to incorporate Item No. 1b. in Section D, “Airworthiness Limitations—Life Limits,” of the Boeing 787 Airworthiness Limitations (AWLs) Document D011Z009-03-01, dated April 2013. This new item is the Systems Life-Limited Parts requirement for replacement of the main and APU battery enclosure vent burst discs.
After accomplishing the revision required by paragraph (h) of this AD, no changes may be made to Item No. 1b. in Section D, “Airworthiness Limitations—Life Limits,” of the Boeing Model 787 Airworthiness Limitations (AWLs) Document D011Z009-03-01, dated April 2013, unless approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (j) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
