Don' t know - probably Jim will be the only one who can answer my question.
Thankyou for the vote of confidence but there are many here on this board that can answer questions on how FS works.
Jim Vile says: '1. If there is no approach code in the database the AI flys the hardcoded .dll approach.' So far I can' t really believe in what he says.
and I would not want anyone to take at face value what I say
I have been wrong many times and will probably continue on that same track as I discover more ways to get FS to act like a real airport
The no 1. statement you are refering to comes from the 2nd post in this link.
http://www.fsdeveloper.com/forum/showthread.php?t=14074
Aquila ask the following 2 questions
Does an Approach also work without an ILS?
And which Approach do AI-Aircraft use to Approach?
My attempt was to explain weather vs non-weather related approaches but did a terrible job at answering his questions
You are correct when you say
So far I can' t really believe in what he says
I should have been more specific in the No 1. to say "If there is no
ILS Approach Code in the database the AI flys the hardcoded .dll approach if the airport is VMC.
snip-----------
What can I do to get AI to land?
Thank you very much for your help!
Lets look at La Palma and see what are some of the issues that need to be addressed. We have a single runway at 170 ft. (once ADEX corrects the altitude) sitting on a Island that is almost 8000 ft high.
When I explain some of the code that AI Planes fly I very seldom discuss the mesh and terrain that surrounds many airports. La Palma is one of those airports that has more complex difficulties that ATC as to overcome.
I want you to imagine a fishing net (grid, mesh) that blankets the entire Island at about 8000 ft high.
When Airplanes approach La Palma ATC looks at the net and trys to keep all planes as high as or higher then the net until clear of all land obstacles. The problem is, FS did not uncover the airport and it is also sitting under the 8,000 ft. high net. Planes flying to La Palma have a hard time descending down through the net in order to be at the correct altitude during the approach. At times some planes may make it then again they may not.
I do not want to get into all the different FS Engines the AI Planes have to muddle through so before we set up a way to break the barrier we need to test your airport.
1. I lowered the airport to 107 ft. using ADE
2. My test flight is a FSX stock GA Flightplan that uses the Beech Baron
3. The flight is inbound at 10,000 ft. (from the south) to GCLA runway 01
4. Set the winds to favor runway 01 (8kts)
5. Set the weather visibility to 3 Miles from 10,000 ft down to 0 ft. We need to force the airport to be IMC. You can save this as a flight and then select after FS is running.
In the following picture and using ADE open approach Mode and set the stock NDBDME
Appr Alt Ft to 2000
Missed Alt to 3000
Default Turn to Right
Save the .ad2 project file and compile
We are now going to use the weather engine to force any AI Plane landing on runway 01 to fly through the 8000 ft barrier net and use the stock NDBDME approach.
My AI Plane is on short final flying the NDBDME Appr
In order to visually watch the plane fly a weather approach do the following.
1. Monitor the inbound plane using the Traffic Toolbox Explorer or slew out to the inbound plane.
2. Once ATC has told the AI Plane to expect the NDBDME Appr you can reset the weather to severe clear visibilty. The weather engine has already done its job and the airport thinks it is still IMC.
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The AI Plane is banking to align with the runway
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.
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and on touchdown my plane wingtips shows the following effects
l_wingtipvortice=fx_wingtipvortice_l,1
r_wingtipvortice=fx_wingtipvortice_r,1
That is because the visual scenery still belives the visibility is 3 mile IMC moisture laden.
Once you know all the kinks are out of the stock NDBDME approach and AI Planes fly it properly then you can start working towards other ways to breakdown the mesh barrier at 8000 ft.
- they all report 10 nm out, north or south, pretty high already but don' t really start a descent. They lower the flaps and the landing gear but pass the threshold at 2.000 ft (estimated) or even higher.
, I have observed that behaviour in one airplane he seem to make a go around but very high and always have intrigued me that. but it's the only one. Don't know if the fact that La Palma default height in fsx was almost that high could something to do with this. 
, the problem could be in the runway itself, not in the approach, look for runway links, taxilines, etc.
