(CNN)The headaches for Boeing over its 787 Dreamliner continue.
The Federal Aviation Administration on Friday issued a directive mandating "a repetitive maintenance task" for that model of airliners due to issues with its power supply. Specifically, the FAA explained testing revealed that 787s could lose all AC electrical power after being continuously powered for 248 days, a problem that -- if left unchecked -- would leave an aircrew unable to control the plane.
The order took effect immediately, with the federal agency finding that there's no good reason to delay the decision.
FAA finds Boeing Dreamliner could lose all power, issues maintenance mandate