Hi all,

I have a problem with the altitude hold and the glide-slope capture.
The altitude hold works well at cruise altitude.
But after the descent (using the AP and the trimwheels) to about 2000-3000 feet for final
approach and slowdown, ALTITUDE HOLD DOESN'T WORK any more.
I am forced to use the trimwheels again to hold the altitude.

Then I position GS Auto for interception of the ILS. Both amber lights go on (Loc and GS)
on the annuciator panel and the loc and glide indication is also present on the Hsi.
The light of the Localiser then turns green and the capture works well.

The light of the Glideslope turns then also green, but the plane dives below the glidepath
and the light goes amber again. GLIDESLOPE IS NOT CAPTURED!
I have to intervene manually again to complete the landing.
Fortunately manual flying is a pleasure with the 707! :)

I have made some research on this forum: several people signaled similar problems with the
glideslope but there was no real solution given, except from loading first the C172, what I do.

I know how to fly an ILS and intercept the glidepath always from below and at the right speed.
It happen's not at a specific airport, but everywhere.
I have tried everything now, it doesn't work!

What else could be the cause of this?


Guy