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by altgoogler 695 days ago
They didn't get a terrian warning because they were landing. Being close to the ground is what they expected. They have both radar & pressure altimeters.

What might have happened is that due to the poor weather they thought they were closer to the airport, or they weren't closely following their glide path, or the aircraft was misconfigured for the RNAV approach. Perhaps a combination of the three.
1 comments
JohnMakin 695 days ago
even 4 miles out from the runway? Thanks I did not know that.
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p_l 693 days ago
If they are too low according to TAWS map, there would be warning even if they were landing. You can inhibit some of the alerts by switching TAWS into "Terrain Inhibit" mode, but that's usually done for landing at runways outside of TAWS database.

That said, TAWS won't fire if you're below airspace-mandated altitude but above "minimally safe" altitude.

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