Ford 2009 Expedition Owner's Manual page 237

Follow the instructions on attaching child safety seats with tether straps.
Refer to Attaching child safety seats with tether straps later in this
chapter.
Attach LATCH lower attachments of the child seat only to the anchors
shown.
WARNING: Never attach two child safety seats to the same
anchor. In a crash, one anchor may not be strong enough to hold
two child safety seat attachments and may break, causing serious
injury or death.
If you install a child seat with rigid LATCH attachments, and have
attached the top tether strap to the proper top tether anchor, do not
tighten the tether strap enough to lift the child seat off the vehicle seat
cushion when the child is seated in it. Keep the tether strap just snug
without lifting the front of the child seat. Keeping the child seat just
touching the vehicle seat gives the best protection in a severe crash.
Each time you use the safety seat, check that the seat is properly
attached to the lower anchors and tether anchor, if applicable. Tug the
child seat from side to side and forward and back where it is secured to
the vehicle. The seat should move less than one inch when you do this
for a proper installation.
If the safety seat is not anchored properly, the risk of a child being
injured in a crash greatly increases.
Combining safety belt and LATCH lower anchors for attaching
child safety seats
When used in combination, either the safety belt or the LATCH lower
anchors may be attached first, provided a proper installation is achieved.
Attach the tether strap afterward, if included with the child seat. Refer
to Recommendations for attaching safety restraints for children in
this chapter.
Attaching child safety seats with tether straps
Many forward-facing child safety seats include a tether strap which
extends from the back of the child safety seat and hooks to an anchoring
point called the top tether anchor. Tether straps are available as an
accessory for many older safety seats. Contact the manufacturer of your
child seat for information about ordering a tether strap, or to obtain a
longer tether strap if the tether strap on your safety seat does not reach
the appropriate top tether anchor in the vehicle.
2009 Expedition (exd)
Owners Guide, 1st Printing
USA (fus)
Seating and Safety Restraints
237