#EGPWS Range

31 messages · Page 1 of 1 (latest)

thorny frost
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Hello,

The current EGPWS range is horrendous, just a few minutes ago I crashed into a mountain range when I was climbing out from Yunzhou Beihai going to Valois. The visibility was poor since I was in a storm, and I was 10 degrees nose up throughout the climb. I only heard the GPWS callout right before the impact. This loss cost me around $11,000.
zazbloon
You might be saying, just be more aware of your radio altimeter, and yes I wasn't exactly focused, but I would love the EGPWS to work better, including on approach, where it sometimes sounds. In short, the problem with the current EGPWS is that it sounds when it shouldn't, and it sounds too late when it should do so earlier.

I hope an upgrade can be implemented sooner or later, as it's only just acting as a Generation I GPWS.

Thank you for reading,

Aurora [G-MNVS] wat

rustic path
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probably the gpws was broken or wasn't activated

clear cargo
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I mean yea the EGWPS is a hit and miss. So more range is better but I can’t think I get many sink rate messages during landing

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TBH the only solution I found is conduct a terrain avoidance manuver

stone cipher
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when it’s not an annoyance it’s just not useful

sturdy zephyr
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So it’s not super handy

rustic path
sturdy zephyr
# stone cipher when it’s not an annoyance it’s just not useful

Well, it’s because it’s not working properly https://en.wikipedia.org/wiki/Ground_proximity_warning_system

Ground proximity warning system

A Ground Proximity Warning System (GPWS) is a system designed to alert pilots if their aircraft is in immediate danger of flying into the ground or an obstacle. The United States Federal Aviation Administration (FAA) defines GPWS as a type of terrain awareness and warning system (TAWS). More advanced systems, introduced in 1996, are known as enh...

sturdy zephyr
rustic path
sturdy zephyr
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It reenables if the Radar alt suddenly drops

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But it doesn’t know the altitude of coming terrain

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It just goes “Hey this raycast intersects with terrain, there is terrain ahead”.

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It doesn’t consider aircraft altitude or position when giving warnings

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It’s just when there is a piece of geometry that can block raycasts ahead

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It’s why you get ghost warnings and such.
The raycast has a very long range and if there is some invisible geometry that blocks raycast it goes OH MY GOD TERRAIN and freaks out

thorny frost
thorny frost
thorny frost
sturdy zephyr
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But the steep mountain sides are so steep that it only reactivates with moments to spare

thorny frost
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ah i see

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thank you

sturdy zephyr
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At least on military jets

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It so that if they are flying near steep cliffs and such the EGPWS knows to not turn itself off

thorny frost
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ah i see

sturdy zephyr
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and it uses the forward looking RADAR to make sure there's nothign there

thorny frost
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Cool!

gusty beacon