I have an undercarriage that is raked forward 12 deg.  On the FSDS screen it works perfectly, but in FS2002 the undercarriage extend to 0 deg.

I have set the part properties correctly.  The keyframes are set correctly.  As I said before, animation on the FSDS screen is absolutely correct.  Why does it go wrong in FS2002 ?

It is a simple part, so the file is not too large.

Yes it does.  The problem is that although it has a forward rake in FSDS, it has zero rake in FS2002.

Apart from that it moves in accordance with my design  --  retracting and rotating.

Thinking about it, I am not sure what is happening.  In the static gear extended position in FSDS, the gear is raked forward  --  in the static gear extended position in FS2002, the rake is gone  --  gear vertical.