![]() ![]() Ideally it will be again via digital ARINC commands, but more likely there will be some "fake" whereby the GPS outputs a glideslope-like signal and the autopilot is fooled into believing it is an ILS glideslope, with the appropriate sensitivity. Exactly how you get a particular autopilot installation to track this virtual glideslope coming out of the GPS, is going to be rather installation specific. This doesn't yet exist in Europe because it needs EGNOS and that is still ( AFAIK) buried in some c0ckups despite it being "certified for life critical uses" very recently. roll steering) installed, the autopilot is either driven from a GPSS converter (whose output fakes the heading bug output of an HSI) and then the autopilot is used in the HDG mode, or it is driven directly digitally, using ARINC commands, from the GPS, in which case you use the NAV mode.Ģ) Getting an autopilot to track a GPS/LPV approach vertically i.e. You traditionally do it in the NAV mode, and as one gets near, the full scale sensitivity automatically winds down from 5nm to 1.0nm to 0.3nm. ![]() I have little knowledge in what is (for Europe the OP is American) a highly specialised area of avionics, but there are two separate issues:ġ) Getting an autopilot to track a GPS approach laterally. ![]() There are NO instructions for this combo either in the S-Tek Pilot operating handbook, the Garmin GNS 430WASS books, or anywhere on S-TEK's website or the internet that I can find. Frankly, I don't know what I did differently the time it worked right, but at least I know it can work!Īny insight to the approach procedures using a GPS WAAS with an S-TEC 65 with GPSS would be appreciated. Trouble is it does not capture the glide slope and continues flying the approach at the final approach fix altitude.Īm I missing something? I shot an approach 5 times today, and it captured the GS only once. I was told that once established on the approach and still under the Glide Slope bars on my HSI I am to switch from the "HDG" mode to the "Nav" mode on the autopilot controller. Where I am having an issue is on the final approach inbound. ![]() The system works well with the turns to way points and the GPSS is anticipating the turns as it should. naturally I may use my altitude pre-select as necessary and Altitude controller as needed. The avionics shop that did the install told me on GPS and LPV approaches I need to select "GPSS" on the Annunciator selector and "HDG" on the Autopilot controller. I am seeking anyone familiar with this autopilot and GPS combo. I recently installed this configuration in my aircraft. ![]()
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