Any "Latest & Greatest" about Endeavor?
04-01-2017 | 06:45 PM
Gets Weekends Off
Joined: Feb 2017
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From: 2nd base
external power
next time you are in dtw come to the 9e mx office and will show you the entry and exit wounds I have from 480volts going in one hand through my body and out the other.. and oh yeah.. that's right... 30 years of aircraft maintenance on my resume.. anyway.. keep your button selected and wear your hat
04-01-2017 | 06:54 PM
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From a MX standpoint, plugging ground power in with the APU gen on does nothing. The relay from the GP is open, and nothing flows. And if the APU gen is off, then so should everything else be in the plane, so plugging in will only draw a little power for the battery bus and battery utility bus. Unless I am missing something, I don't see it as an issue from an electrical/MX point of view.
And the GPUs don't put out 480V. And if there WERE to be a feeder fault (highly unlikely, but possible), the GCU would open the circuit immediately to prevent damage to the plane.
Feeder fault, under voltage, over voltage, under freq, as well as correct phase rotation are all features of the GCUs as I recall.
And the GPUs don't put out 480V. And if there WERE to be a feeder fault (highly unlikely, but possible), the GCU would open the circuit immediately to prevent damage to the plane.
Feeder fault, under voltage, over voltage, under freq, as well as correct phase rotation are all features of the GCUs as I recall.
04-01-2017 | 07:01 PM
Gets Weekends Off
Joined: Feb 2017
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From: 2nd base
external power
the input power to gpu is 480 volts so gather yourself some additional facts and I am sure you have ata 24 on lock down so you guys select or don't select any button you feel like.. I will just be sure to let everyone in mx know to deselect in the cockpit first... It does have the potential to kill someone and damage the aircraft regardless of what Thomas Edison had to say previously... with that.. I digress
04-01-2017 | 07:05 PM
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If the APU GEN is on, and the switch is out, how much power flows when connecting the AGPU? What about if the switch is in?
04-01-2017 | 07:09 PM
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From: 2nd base
external power
2 senior lead mechanics.. 2 senior line mechanics and 1 avionics tech currently in the gate office.. we all agree leaving that switch permanently selected can only lead to trouble... had johnny gone to the police right away... none of this would have ever happened..... I honestly like the thread about the bow/cg having to be adjusted on the entire fleet due to efb and no more crew bags
04-01-2017 | 07:13 PM
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Totally agree with the Mx guys on this one
Isn't this what caused the fire in pvd? The switch was left in and a bad gpu was plugged into the bird and someone left the switch in? The power would go on and off and on again over and over until bad things happened.
Could be wrong but I think that was it.
Don't leave the switch in regardless.
Isn't this what caused the fire in pvd? The switch was left in and a bad gpu was plugged into the bird and someone left the switch in? The power would go on and off and on again over and over until bad things happened.
Could be wrong but I think that was it.
Don't leave the switch in regardless.
04-01-2017 | 07:30 PM
Bracing for Fallacies
Joined: Jul 2007
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From: In favor of good things, not in favor of bad things
2 senior lead mechanics.. 2 senior line mechanics and 1 avionics tech currently in the gate office.. we all agree leaving that switch permanently selected can only lead to trouble... had johnny gone to the police right away... none of this would have ever happened..... I honestly like the thread about the bow/cg having to be adjusted on the entire fleet due to efb and no more crew bags
04-01-2017 | 07:32 PM
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You are likely talking about the 277/480 4-wire wye building commercial power. That power never touches the aircraft. But I'm certain you know that.
next time you are in dtw come to the 9e mx office and will show you the entry and exit wounds I have from 480volts going in one hand through my body and out the other.. and oh yeah.. that's right... 30 years of aircraft maintenance on my resume.. anyway.. keep your button selected and wear your hat
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