Zaherk Posted September 15, 2008 Share Posted September 15, 2008 Had a AC phase distribution diagram where each and every switch,light,valve,pump,instrument,etc. power source was shown, whether it was 3 phase or single phase, from what phase on a specific Bus. Can anybody help, please? Only the fairies will know what happened to my copy. Quote Link to comment Share on other sites More sharing options...
tinyclark Posted September 15, 2008 Share Posted September 15, 2008 You want main and/or essential, and for what year model? Quote Link to comment Share on other sites More sharing options...
US Herk Posted September 15, 2008 Share Posted September 15, 2008 Zaherk wrote: Only the fairies will know what happened to my copy. Coincidentally, the RAF calls their electricians \'fairies\'... Other than that, I\'m no help! B) Quote Link to comment Share on other sites More sharing options...
Zaherk Posted September 16, 2008 Author Share Posted September 16, 2008 Tiny Clark, Our Herc Ser no 4475, Model L100-30 1972. We had the Ess AC B phase CB\'s popping on us during just about every flight. No bus off light but during taxi when you check your Aux feather pump motors for a load increase there is no loadmeter increase but your Ess bus off light illuminate. Releasing the Condition lever the Ess bus off light goes out and everything looks normal until you open the 245 to find the B phase CB\'s popped. Changed the Aux hyd pump, no CB popping for two flights and then she was back to popping. The Sparkies found some of those B phase CB\'s popping at 17 amps instead of the rated 35 amps. They changed the CB\'s. So far no problems. If you\'ve got a schematic of the Ess and Main, what gets fed of each phase would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
tinyclark Posted September 16, 2008 Share Posted September 16, 2008 Send me a good e-mail address. Electricians are fairies? Hmmmmmm, I won\'t ask what nav/RADAR techs are then. All I know is we do with higher frequency. Quote Link to comment Share on other sites More sharing options...
n1dp Posted September 16, 2008 Share Posted September 16, 2008 Start checking all your terminal strips and terminal lugs. Try some \"pull\" tests on those lugs. Something is loose. Anyone change a Bus contactor recently? Quote Link to comment Share on other sites More sharing options...
Zaherk Posted September 16, 2008 Author Share Posted September 16, 2008 Tiny Clark Did send an e-mail address to your PM. n1dp Will get our \"Fairies\" to check out those lugs. US Herk We also call our Electricians \"Fairies\" in the Southern tip of Africa. Regards Quote Link to comment Share on other sites More sharing options...
Guest Posted September 17, 2008 Share Posted September 17, 2008 Tiny, I recall radar pukes being referred to as \'pointy-heads\' and \'weenies\' on occasions---or maybe that wasn\'t meant for all, just for me....:huh: Quote Link to comment Share on other sites More sharing options...
n1dp Posted October 5, 2008 Share Posted October 5, 2008 Have you found the problem yet? The \"Fairies\" here are curious! Quote Link to comment Share on other sites More sharing options...
Zaherk Posted October 5, 2008 Author Share Posted October 5, 2008 n1dp, The Sparkies found some of the Ess AC Bus B phase CB\'s popping at 17 amps instead of the rated 35 amps. They changed the CB\'s. So far no problems. Suppose that\'s why we thought it was the Aux pump, the initial spike when you switch the pump on caused a higher than 17amp current draw which popped the damaged CB. Not once did one of the auxpump CB\'s popped. In hindsight, only the Ess Ac bus B phase CB\'s popping and not the Aux pump CB\'s was trying to tell us something but we did not listen. Quote Link to comment Share on other sites More sharing options...
n1dp Posted October 6, 2008 Share Posted October 6, 2008 Thanks for the update! Dave Quote Link to comment Share on other sites More sharing options...
SonnyJ Posted December 3, 2008 Share Posted December 3, 2008 ZaHerk (Zac?), Do you guys still have the C/B laying around? We are tasked to look into voltage spikes affecting the TD system. If not could you email me a POC who did the troubleshooting? Quote Link to comment Share on other sites More sharing options...
Zaherk Posted December 10, 2008 Author Share Posted December 10, 2008 Hi Sonny J, I\'ll talked to the guy who did the troubleshooting and changed the CB\'s. Check your mail. Zaherk Quote Link to comment Share on other sites More sharing options...
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