zibo ils problem

[Bilal2104 213]

Hey guys,

 

Another quick question if you dont mind, running the zibo 737. Just come from the pmdg p3d series to try x plane and loving it so far. i seem to think im doing everything right from takeoff to final approach the same as i did in p3d, however in p3d i used to come in at 90 degrees from the localiser/ Gs and it captured with no problem and ils was possible, however with the zibo im having troubles with the same 90 degree approach lets say at 2000ft , the loc symbol goes green on the pfa but for some reason the A/C turns the opposite direction and flies its own course. ive read to tick the checkbox disable downwind ils or so made no diff so i unchecked the box. 

Ive set the courses correct on CPT and FO side

both freq are entered for ils correctly.

 

i cant seem to see what im doing wrong everything in the flight is good until the landing part i screw it up big time, has anybody got any suggestions or so?

 

many thanks.

[HighBypass 2,339]

The problem may be coming in at 90 degrees to the localiser. In real life it should be no more than 45 degrees or more usually 30 degrees.. perhaps X-plane is more realistic in that regard?

https://aviation.stackexchange.com/questions/33306/what-is-the-maximum-interception-angle-for-ils-when-on-radar-vectoring

All I can say is that when being vectored to an ILS in FSX:SE (my sim) then the default ATC usually has me on a 30 degree intercept..

[Bilal2104 213]

8 minutes ago, HighBypass said:

The problem may be coming in at 90 degrees to the localiser. In real life it should be no more than 45 degrees or more usually 30 degrees.. perhaps X-plane is more realistic in that regard?

https://aviation.stackexchange.com/questions/33306/what-is-the-maximum-interception-angle-for-ils-when-on-radar-vectoring

All I can say is that when being vectored to an ILS in FSX:SE (my sim) then the default ATC usually has me on a 30 degree intercept..

that makes a lot of sense to me i wonder why PMDG accepted it at that type of sim level. ill try it out now and post results

many thanks

[HighBypass 2,339]

Or perhaps why Lockheed Martin allowed it in their sim? PMDG products react to the code they get from the sim and perhaps no one at PMDG coded in a requirement to intercept the localiser at no greater than 30 or 45 degrees thinking that the sim itself wouldn't let you do that? Just conjecture on my part, I don't know.

[HighBypass 2,339]

I found this which might explain a couple of things..

https://www.prepar3d.com/SDKv4/prepar3d/vehicle/usage/using_autopilot.html

Quote

Capturing a VOR course, Localizer, or GPS course

Remember: never ask the autopilot to do something you can't (or wouldn't) do yourself. For example, no good pilot would be able to make a 120-degree turn and intercept a localizer while flying at 300 knots less than a mile from the localizer; neither would an autopilot. Keep your expectations realistic. If you make things easy for the autopilot, the autopilot will make things easy for you.

To engage/disengage Navigation mode

Click the NAV button.
-or-

Press CTRL+N.

Don't get me wrong. I'm not calling you out for getting away with a 90 degree offset to intercept! If that has worked in the past then why would anyone think anything different?

Why I quoted that part of the P3D documentation is that to me, whilst it infers that no good pilot or autopilot would be able to make a 120 degree turn to intercept, it doesn't specifically say that the sim won't let you try - the instrument can detect the localiser beam after all. Given that, then why would PMDG NOT accept the sim?