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Garmin GPSmap 496 False Terrain Alert
Do any of you fly into KADS with a Garmin GPSmap 496? I'm getting a false
terrain alert when flying the Rwy 15 ILS and am wondering if anyone else has this problem. I'm working with Garmin to resolve this, but so far what they have suggested has not solved the problem. When flying the approach the 496 makes the "500 feet" announcement just as expected. Next, an obstacle warning occurs which is OK, because of the upcoming Addison water tower that is just to the east of the runway. The 496 announces "Warning, Obstacle ahead." Notice that this is just a warning. Next, a Terrain warning occurs. The unit announces "Warning, Terrain ahead." Then it alerts "Pull up. Pull up!" This should not occur. We're exactly on the glide slope, with our normal approach speed of 120 MPH, and a 500 to 600 foot rate of descent. We're at an altitude of approximately 300 feet when the Terrain alert occurs. This is very disconcerting to the passengers, and if I was really flying the approach in IMC, you can be assured that this would be extremely disconcerting to me! At no time during the approach have we gone below the glide slope. Glide slope intercept at JERIT, the FAF at 2000 feet, confirms that our glide slope receiver is OK along with the proper VASI lights as we get closer to the runway during the approach. The 496 is fully updated with the latest software (V3.40 released Jan08) and with the current Jeppesen database and the current Obstacle database. The problem also occurred with the previous software version 3.30 and the prior terrain database. The "nearest airport" criteria is set to the default, "All airports" and the alert look ahead is set to 90 seconds. Everything else is set to the default. The unit does not give a Terrain alert when landing on the opposite runway, 33. Nor does it give a Terrain alert when landing at any other airport. This Terrain alert including the command "Pull up, Pull up" only occurs when flying the ILS 15 approach into KADS during short final. Thus far the support fellow at Garmin (Todd) has verified the pertinent options and settings in my unit, asked that I update to the latest software, and update to the latest terrain database. This hasn't helped, and after checking with the other support technicians, they are stumped. Unfortunately, neither Garmin nor I have been able to get the unit to give a terrain alert in simulator mode, but it does it 100% of the time in the air. Anyone have any ideas? Has anyone flown with the GPSmap 496 into KADS with audio alerts enabled and gotten the same terrain alert? Has anyone experienced a similar problem at any other airport? Thanks, -Ron Gordon Ron "at" GordonFamily.com 1968 V35A Bonanza N8485N |
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