Deanm,
The reference to fixed leading edge is to the permanently fastened panel sections (with hi-loks) as opposed to the removable access panels.
On the B777 there are fixed fiberglass panels between the stab leading edge and the torsion box; these are what they are referring to.
Not sure if the panels are fiberglass with aluminium honeycomb though. I thought the B777 doesn't use this type of honeycomb.
Can anyone shed light on the panel structure?
Peabody