Service Bulletin 747-24-2246
Last year AD note 2009-15-12 has been published. This AD note prescribes to accomplish Boeing SB 747-24-2246. The purpose of this SB is to give flight crew the possibility to remove electrical power from IFE and other non-essential systems through left and right utility switches S19 and S20, and keep the passenger reading lights on by switching them to the AC busses. Is there anyone who has experience with this SB? What is the added value of this modification to the present system? By switching S19 and S20 to "OFF" you're already removing power from all non essential systems...