Please don't leave your 787 powered on for 248 days straight...
New FAA AD:
https://s3.amazonaws.com/public-inspection.federalregister.gov/2015-10066.pdf
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.