I'm having a problem getting the ILS to track the GS  successfully.  It tracks the localizer okay but, when the GS locks on, it is sluggish and erratic at best. It appear to track, then lose it followed by excessive rates of climb or descent.  All indications [ Lights] show a lock on of the GS.
I believe I'm familiar with the procedures to use with ILS.     I love this A/C even with this Glitch.  Anyone got any ideas what is wrong, or is it just finger trouble.  

I had a very similar problem when I first got the aircraft, but I never had any difficulty after I learned to maintain my approach speed at 140kts.

>^..^<

Seejay:

Try this: Go to the altitude at which you expect to intercept the glideslope, set the AP to Altitude Hold, then engage the G/S Auto position on the AP. ILS Lock will remain green and G/S lock will be yellow until intercept, at which time the Altitude Hold will desconnect and the G/S light turn green. The airplane will follow the slope correctly. For some reason, it pitches up slightly just before starting the descent.  

I've noticed that if you engage the G/S Auto position and continue to make manual changes in altitude, the airplane behaves as you described.

abo265 wrote on Jan 13^th, 2011 at 9:25pm:

For some reason, it pitches up slightly just before starting the descent.

It seems to want to capture the G/S just before the G/S and the 707's altitude actually meet. This causes it to climb about 100 feet to catch the G/S. It's not a big problem though. ;)

Mark