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An interesting thread on AirDisaster.com (including video) discusses
the false glideslope indications that nearly did in an Air New Zealand flight some years ago. This is particularly interesting given that the FAA no longer seems to require an outer marker or equivalent on ILS approaches, making it much harder to check for correct glideslope indications. http://airdisaster.com/forums/showthread.php?t=83775 Here's an excerpt from an article linked in the 7th post in that thread that explains why it happened: "On the night of July 29, 2000, the glideslope sidelobe amplifier was not operating in Apia. In addition, the ILS ground equipment had been left in bypass mode following calibration maintenance. This prevented system transfer to the standby transmitter. No alarm sounded in the control tower because the cable that fed information to the tower navigation status displays had been cut during construction. As a result, the Air New Zealand flight received only the glideslope carrier wave transmission, which was interpreted by the instruments as being on glideslope, with no warning indications." |
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