CRAW Posted September 17, 2011 Share Posted September 17, 2011 The CO-pilots HSI displays a to and from Nav flag when either the #2 INS or the #2 TACAN is selected. The INS and TACAN systems work 4.0. We have already swapped HSIs and INUs and have been looking at relays with no luck so far.:confused: Has anyone seen this before? Quote Link to comment Share on other sites More sharing options...
jhazlett Posted September 18, 2011 Share Posted September 18, 2011 Do you get DME when TAC 2 is selected? Two relays in the flight data switching panel relay the INS distance info from the copilots distance relay to the copilots HSI. When deenergized, the NC contact of the copilots distance relay receive TACAN distance info. They both talk to through this distance relay. look in the schematic and See where your Nav flag relay and tac 1 and 2 relays are energized along the path. Has to be a relay. Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted September 19, 2011 Share Posted September 19, 2011 I agree sounds like one of your NIS (nav inst switching) relays and they can be a pain in the arse... Check your copilots HSI data relay. Be careful with the screws they break.... They are all the same so you can switch them out and there is a test set but can't remember ever using it... Hope you do not need to change the cannon plug it sucks!!! Quote Link to comment Share on other sites More sharing options...
jhazlett Posted September 27, 2011 Share Posted September 27, 2011 Update: 28VDC not at NAV SEL switch and not at co-pilots distance relay. Everything else works fine (HSI data from INS/TAC) were just not getting the power to suppress that NAV flag. What i don't understand is, If there is no power at the Distance relay (Where both INS and TAC meet) you would think that when i put coordinates into the INS i would just get default TAC DME and Nav data (since that is how the system is setup). When i select INS 2 on the co-pilots side, I get usable data from the INS 2. Quote Link to comment Share on other sites More sharing options...
Guest Posted September 28, 2011 Share Posted September 28, 2011 Once upon a time, there was a common problem to do with where the Nav Sys Select toggle switch was set, to normal or slave. Quote Link to comment Share on other sites More sharing options...
tinyclark Posted October 8, 2011 Share Posted October 8, 2011 I'm kind of confused on your issue. Is the NAV flag inop or the to-from flag inop? What does that have to do with your DME? Is the DME flag incorrect? Aircraft tail number?? Quote Link to comment Share on other sites More sharing options...
tusker Posted October 8, 2011 Share Posted October 8, 2011 HSI!!!!!!..........Horizontal Situation Indicator!!!!!!.............Oh Well!!!!!!!!!....I rest my case!!! Quote Link to comment Share on other sites More sharing options...
jhazlett Posted October 15, 2011 Share Posted October 15, 2011 @tinyclark. The Nav flag will not go away. Everything works 4.0 for the Nav system selected, but that NAV flag will not go down. That's the issue. Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted October 15, 2011 Share Posted October 15, 2011 Just so we are sure this is the flag we are talking about.... Quote Link to comment Share on other sites More sharing options...
tinyclark Posted October 27, 2011 Share Posted October 27, 2011 Does any one know what C-130s are at Andrews? Kind of hard to help someone if we don't know the year model and specific wiring diagram to use. Quote Link to comment Share on other sites More sharing options...
bobdaley Posted October 28, 2011 Share Posted October 28, 2011 Navy C-130T's Bob Quote Link to comment Share on other sites More sharing options...
tinyclark Posted October 31, 2011 Share Posted October 31, 2011 Whoo, that doesn't help their cause, I have no diagrams for them, or know what systems they have. Gotta be an open somewhere. Where is your NATEC guy? Quote Link to comment Share on other sites More sharing options...
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