f1drivr Posted September 19, 2012 Share Posted September 19, 2012 Hi, All Normally when the battery is turned on you will get 4 AC and 3 DC bus off light, tie the DC bus then all three DC buses will be powered. On tail # 74-4704 the ISO bus off light will extinguish when the battery is turned on, with out DC bus tie SW tied? The ISO off light will not press to test at this time. When the DC bus tie is tied the ESS and Main DC lights extinguish and the ISO will Press to Test. I guess this was the original operation, but was changed by a TCTO to the normal way listed above. Does anyone know what the TCTO is that changed this or why it changed? Thanks Quote Link to comment Share on other sites More sharing options...
kersey9502 Posted September 20, 2012 Share Posted September 20, 2012 The TCTO that was for the modification for the isolated DC circuitry was 1C-130-941. The result of this modification will alert aircrew of this condition so that battery power conservation measures may be initiated to limit power usage to essential requirements. As far I know this TCTO should not have affected the press to test function. All the lights are jumpered together for the press to test. Where is this aircraft from? When the Battery is turned on, the Isolated bus is always powered. This is what bus the lights are powered off of. Quote Link to comment Share on other sites More sharing options...
DC10FE Posted September 20, 2012 Share Posted September 20, 2012 f1drivr, tail number 74-4704 is not a C-130 number, nor is it a tail number for any USAF airplane. A typo? Don R. Quote Link to comment Share on other sites More sharing options...
f1drivr Posted September 20, 2012 Author Share Posted September 20, 2012 I looked on the allherks list and it said it was 74-4704, maybe the list is wrong. I'll confirm with the data plate. It's a PI plane. Thanks Quote Link to comment Share on other sites More sharing options...
f1drivr Posted September 21, 2012 Author Share Posted September 21, 2012 Thanks, Kersey that's the TCTO we were looking for. The tail is 74-02071 Quote Link to comment Share on other sites More sharing options...
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