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FAA orders new 787 electrical fix to prevent power failure
All Boeing 787 operators will be required to periodically deactivate the electrical system to avoid a problem with a newly-discovered software bug that could cause the aircraft to lose alternating current (AC) power, the US Federal Aviation Administration says in a new airworthiness directive. The agency adopted the final rule after Boeing reported the results of a laboratory test showing a total loss of power is possible if the generator control units run continuously for eight months, says the… (www.flightglobal.com) Más...So it's possible that the electrical system was on continuously even during the various maintenance checks? Come on ...
Good point. I don't totally buy that, either. That being said, I have worked on systems that have ridiculously onerous "Keep Alive" power schemes -PITA to bypass.
Is it even normal operating procedure to have the APU on while towing the plane into the hangar for the check?
[Is] the APU on while towing the plane?
That would sound like normal ops to me. I wouldn't want to depend on battery power to run the auxiliary hydraulic pumps to stop the rather large aircraft when the tow bar breaks! I'm sure there is a brake hydraulic accumulator, but why take chances! Maybe a reply from some 787 mechanics would be nice...
That would sound like normal ops to me. I wouldn't want to depend on battery power to run the auxiliary hydraulic pumps to stop the rather large aircraft when the tow bar breaks! I'm sure there is a brake hydraulic accumulator, but why take chances! Maybe a reply from some 787 mechanics would be nice...
APU doesn't need to be running; the LiON pack has substantial capacity. You'd have to ask someone familiar with that model's power distribution / power management scheme. I've seen a basic flowchart and remember thinking "good luck!".. ..
You're right. I'm sure Boeing made it all up...
"Have you tried turning it off and on again"!!!