nav radio obs indication off 90-deg

[bradp]

Hi guys

 

I noted on my last flight that my 40-year odd KX170B has suddenly decided to indicate off by exactly 90-degrees (i.e. I'm on the 180-radial inbound and the NAV2 is indicating I'm on the 090-radial inbound).  Picks up VORs no problem.  Just odd that it's off by exactly 90-deg.  I'm thinking that this will probably mean a replacement box but I just found it odd. Will play in to whatever I decide for WAAS upgrade etc 

 

thanks

 

b

[Browncbr1]

what model indicator do you have and how old is it?...  I just replaced one of mine that was super old showing about 10 degrees off VOT...  It was an old KI-201, which I understood is really difficult to repair.. apparently, there is a graphite disc inside that is very brittle... I found a lightly used KI-208 for $230 with the plug... if you have an older cdi, you may want to bench test the KX170.. If it checks out, then just go get a 208 rather than bother repairing an older indicator.    

[N201MKTurbo]

The KX170 sends detected nav audio to the indicator, all decoding is done in the indicator. This means the radio is OK. It is probably a loose connection. I would let a shop take a stab at it before I trashed it.