YsniperY

Hey Guys, I appreciate all of your comments. My GNS530 is not WAAS yet so I cant do the LPV approach. When I turn the course selector knob on the HSI the heading matches fine with what's displayed on the 530 test page. The general consensus that I'm getting from you all is that it's most likely in the wiring/splitter from the 530 to the HSI. Why the avionics shop didn't check this 7 years ago is beyond me; they came to the conclusion it was the paint but any person doing this type of work should know if the secondary instrument is working fine then it's not the antenna. geesh. I appreciate all your help and timely responses! I hope others with similar issues see these posts and it helps them too. Thanks again. Jay

Hey guys thanks for responding. I talked to an avionics shop not long after posting this and like LarryB stated they think it has to do with the inexperienced avionics installer at a different shop not using the correct splitter or something in the connection from the GNS530 to the HSI. It sounded like something that could be diagnosed and fixed relatively easily. We’ll see I guess. If anyone else has any experience with this type of thing let me know. I appreciate it. Jay

Hi guys, I have a Mooney M20K with an HSI and KFC150. It always passes the auto check fine on the ground and all. My issue is when I’m flying an ILS approach and want the autopilot to fly it. The localizer bars come online many miles out and the plane turns and tracks down that just fine. At about 10 miles out the glide slope bar on the KI206 (secondary VOR/localizer/GS) indicator pops up showing I’m below the glideslope which is normal but the glideslope flag on the HSI is still showing. After a few more miles and when I’m usually above the glideslope the glideslope bar on the HSI finally decides to wake up. By then it’s too late for it to couple to the autopilot and have the GS light come on and for the autopilot to track the glideslope although it’s still tracking the localizer. Sometimes I’ll use the control wheel steering button to “nose dive” a bit so the plane will descend down through the glide slope and then the GS light on the autopilot will come on and then it will take over and fly the plane down to the runway. It’s like the signal to the Glideslope portion of the HSI is weak or something. Isn’t it the same antenna as the KI206? Then today I flew it and the GS light on the autopilot won’t come on at all whether I fly down through the glideslope or not and the autopilot never does connect and follow the glideslope although the localizer is tracking fine. (The GS light isn’t burned out). When I took it to the avionics shop about 8 years ago they did an “overhaul” on the HSI and “turned up the signal” whatever that means and said they didn’t see any thing wrong with it although they didn’t fly it. They said it could be that some moron painted the fin type antennas on the tail with metallic paint. I removed the paint and it didn’t make much difference plus the KI206 seems to work just fine. Is it possible to swap the wiring from that portion of the HSI with the KI206 and see if it behaves differently? Any ideas? I’d greatly appreciate any help. Thanks. Jay