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FSXA Problems with AI at LIEE

raymk

raymk

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unitedkingdom
I am seeing problems with AI arriving traffic at LIEE / Elmas Cagliari Italy.

I have got to the end of doing my updates to the airport to improve it visually and allow for improved AI traffic performance. I now check that AI can depart and arrive as required. Departing aircraft are OK but arriving aircraft are performing very strangely. LIEE has runway 14/32 with ILS only operating on 32 - this works fine when I do an approach in my own user aircraft.
However, approaching AI are not doing what I expect. They are somewhat erratic on the way to the airport in that they are staying far too high before making the necessary turns and altitude reductions prior to landing. I have also had an aircraft going under the ground about 8 miles out on approach to rwy 14 and aircraft intending landing on rwy 32 mostly stay far too high and are still at 2500ft when reaching the runway threshold - they then do a go-around.
I have used the same aircraft at a similar style airfield (LFPR Faro) without seeing this type of behaviour so cannot 'blame' the AI aircraft (Traffic X supplied).
I am suspecting that the 'Approaches' may be at fault here but as I have never 'messed' with ADE Approaches I was hoping that somebody could check that the default FSX LIEE approaches are functional. My airport modifications started with the default FSX LIEE file and I have not made any changes to the Approaches. I have disabled my revised version of LIEE so that FSX uses the default one and I get the same erratic behaviour of arriving aircraft - so I don't think that it is anything that I have done.
I attach my ADE file plus some charts that I found on the web if anyone is willing to have a look.
 

Attachments

Is LIEE in mountainous territory? Are the flight plans IFR. If so, your problem may be the FSX AI engine. For IFR, the AI Engine ensures that IFR aircraft stay well above terrain, often leaving them too high to reach the runway at the programmed descent rate. Try changing a leg or to two VFR.

For a fuller explanation and a lot of other helpful input from Jim Vile on the topic, please see this thread.

Don
 
Just edit the approaches as follows:

ADE_approaches_LIEE_01.jpg ADE_approaches_LIEE_02.jpg ADE_approaches_LIEE_03.1.jpg ADE_approaches_LIEE_03.2.jpg ADE_approaches_LIEE_04.1.jpg ADE_approaches_LIEE_04.2.jpg
 
HF

thanks for taking a look - will find time tomorrow to make your suggested changes - will report back asap.
 
gadgets said:
Is LIEE in mountainous territory? Are the flight plans IFR. If so, your problem may be the FSX AI engine. For IFR, the AI Engine ensures that IFR aircraft stay well above terrain, often leaving them too high to reach the runway at the programmed descent rate. Try changing a leg or to two VFR.

Don
Click to expand...

Don,
I wouldn't say that there is enough high ground to cause a problem. The plans are IFR. There is a randomness about what is happening. The approach to 32 is over the sea and the approach to 14 is over a flat plain.
 
raymk

The problem with the ILS 32 is FSX has the FAF at 2.2 miles from runway end with a altitude of 2700 ft. No AI Plane can descend from 2700 ft in 2.2 miles and land.

The proper FAF is 8 NM from runway using ILS PAPA chart and is FD32 Terminal_Waypoint.

In the following pictures we need to change the approach data so the AI Planes landing profile is within the correct flight dynamics that is expected from the AI Engine .dll files.

Select the ILS 32 from the list then click the R32:ILS heading
Go down to the Fix Ident and change to FD32



In this picture select the 1st CF leg in the list and change the data in the lower window too match what I have.



AI will now land on runway 32 in all weather.

Runway 14 is a visual approach in clear weather. This means all AI Planes will have to use their flight dynamics in order to land. That is a problem for many types of AI planes that need additional help in order to get down to the FAF altitude. Many AI Planes will fall through the hardfloor of the FAF and hit the ground before the runway due to their high descent rate.

If you set the weather to IMC and winds to favor runway 14 then the ATC engine will select the VORDME 14 approach. This has all the approach data to help those poorly written FD's that many AI planes have.

Another option for poor AI plane performance for runway 14 is to use a better set of FD's.
 
Last edited:
Jim,
thanks for your input and your correction suggestions.
As I said previously, having found these problems at LIEE, I went back to LFPR (which has similar runway facilities) and found that IFR AI aircraft were landing quite happily on the non-ILS end seemingly without any difficulties so I was puzzled by what happens at LIEE.
I will try your recommended settings and report back here.
 
jvile / hotelfox / gadgets

thanks again to you all - I now have AI landing on LIEE RWY 32 in a much improved and consistent manner - almost lifelike!

I promise to read all information available in the manual and in this forum to try and get some sort of understanding of the APPROACHES topic but don't expect me to become an expert!

Sorry about the delay in implementing your suggestions but have had to take time off to make the ultimate decision regarding my 17 year old pet cat whose health has deteriorated in the last 4 weeks.
 
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