Hello, this is my first post here and If this has been covered, I am sorry, but could not find my exact problem..
I just traded my F model in on a 1985 K model, with a KFC 150 with VS and ALT preselect and a 530W comm 1 and a 430W comm 2
Flying an ILS approach the KFC 150 works good, a little left of center but very good and captures the glide slope perfectly.
However, on an RNAV approach it will track the inbound course fine, and the 530 will switch to LPV mode, but the autopilot will not catch the "glide slope"
The HSI indicates that I am below the glide path correctly when first starting the approach but will not catch it and fly it.
Any help will be appreaciated
Thanks
Richard