flight director not working during ILS approach in P3DV4

[vvince]

Hello,

I have been playing quite a bit at different airports with the ILS, and cannot figure if I am doing something wrong, if my plane is broken, or if did not understand ILS in the T38.
During an ILS approach, it seems that the ADI steering needles are not working as they should.
The ILS frequency is properly set, the approach course is set in the HSI, and the Steering Mode switch is on normal :
With the Nav Mode selector on Localizer, I first align roughly with the CDI of the HSI (which is properly working).
Then, looking at the ADI there's as expected only the steering bar (the vertical yellow bar), but it only indicates the bank of the aircraft : the needle is centered when there's no bank, no matter if the plane is on course or off course. And no glide path marker on the left.
Switching the Nav Mode selector to ILS, the glide path marker appears (and properly displays the position of the aircraft with respect to the glide path), as well as the pitch steering bar (the horizontal yellow bar). But the pitch steering bar does not work neither, it does not not steer toward the glide path (but rather keeps centered when the pitch of the aircraft has a certain value).

So to sum up :
(1) no glide path marker when the Nav Mode selector is on Localizer (according to the manual it should be displayed),
and both steering bars of the ADI are not indicating what they should :
(2) the (vertical) steering bar wants you to keep the plane with no banking, and the indication is unrelated to your course deviation,
(3) and the (horizontal) pitch steering bar wants you to maintain a certain pitch (or angle of descent maybe?) but the indication is unrelated to your position with respect to the glide path.
Basically the steering bars do not steer...

I found this older, unanswered, topic with a similar issue :
https://milviz.com/forum/viewtopic.php? ... ils#p57267

Thanks for any help

Vvince.

[JonathanBleeker]

@N4GIX?

[N4GIX]

I have nothing to do with the ADV version of the T38. That would be Alvaro I believe.

[JonathanBleeker]

I don't believe he touched the avionics. The flight director is still the same as the non ADV.

[Alvaro]

I don't believe he touched the avionics.

I confirm it.

[N4GIX]

Okay then. I'll take a look at this as soon as I can.

[vvince]

Any news on this matter?
Cheers
vvince

[Richard Portier]

Any news on this matter?
Cheers
vvince

+1
Richard

[vvince]

Any chance that this issue will be addressed some day?
It was reported more than 6 months ago, and still no substantial reply since then ...

Cheers
Vvince

[JonathanBleeker]

The T-38A ADV is undergoing a recode at the moment which should solve this issue.

[CF104]

Hey vvince,

Thanks for confirming this issue that I brought up more than 3 years ago. I'm disappointed that it took Milviz this long to acknowledge a problem.

I hope that they do fix it as the T-38A ADV is a fun plane to fly.

Cheers,

John

[JonathanBleeker]

There is quite a bit being changed that should resolve all .

[vvince]

There is quite a bit being changed that should resolve all .

Will the issues only be solved on the new Redux version, or also on the older T38A?

[JonathanBleeker]

Only on the redux. The code has been redone completely.