AC GENERATOR DISABLED !

[tenten]

“Most first start of the day" generator no3 required resetting, sometimes resetting by the control switch dose not function, needs to be manually reset from generator control panel; once reset it will be as advertised during flight and during the subsequent starts of the day.

Generator control panel swapped with no effect; any help will be appreciated. Having C-130H

[NATOPS1]

Your generator (PMG) is most likly bad.

the PMG (Permanent Magnet Generator) inside the generator, upon start should tell your VR to send start up excitation voltage to the "excitation generator" which starts to increase the "main generator" output.

Resetting sends aircraft DC to “excite” the generator.

I would swap the VR out with a know good one (you have four others on the aircraft) and see what happens.

If it remains I would change the Generator when the aircraft goes into ISO or Phase or whatever you call your inspections or it fails…

[tenten]

Thanks NATOPS1 for the new information regarding the possibility of voltage regulator to be one of the causes.

Aircraft on a rest, the last corrective action done by our maintenance was cleaning and re-correcting some looseness on the generator control panel receptacle, engine started twice defect not duplicated yet; waiting for the next.

[NATOPS1]

Anytime! Glad to try and help...

FYI,

The PMG tells the VR to send excitation voltage to the GEN which is routed through the GCR inside the GCP so there are a couple of connections that can cause this.

You may have solved the problem as any loose contact from the PMG to the VR or from the VR to the GCP or the GCP to the Gen could be your problem.

[tenten]

Defect hit back again, voltage regulator swapped with another regulator, defect transferred to the other.

Thanks for the advice NATOPS1, seems we catch the accountable.