FORD 2003 Expedition v.4 - Manual (Page 183)

Do not use extensions to change the fit of the shoulder belt
across the torso.
Safety belt maintenance
Inspect the safety belt systems periodically to make sure they work
properly and are not damaged. Inspect the safety belts to make sure
there are no nicks, tears or cuts. Replace if necessary. All safety belt
assemblies, including retractors, buckles, front seat belt buckle
assemblies, buckle support assemblies (slide bar-if equipped), shoulder
belt height adjusters, shoulder belt guide on seatback (if equipped), child
safety seat LATCH and tether anchors, and attaching hardware, should
be inspected after a collision. Ford Motor Company recommends that all
safety belt assemblies used in vehicles involved in a collision be replaced.
However, if the collision was minor and a qualified technician finds that
the belts do not show damage and continue to operate properly, they do
not need to be replaced. Safety belt assemblies not in use during a
collision should also be inspected and replaced if either damage or
improper operation is noted.
Refer to Interior in the Cleaning chapter.
AIR BAG SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Seating and Safety Restraints
183