Graco 8480 - Manual (Page 36)

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For the safety of your child, use the car seat in
forward-facing aircraft seats only. Follow the
flight attendant’s instructions about car seat
placement. Install your car seat on an airplane
the same way it is installed in an automobile.

Always be sure that the airplane seat belt is
adjusted so that it tightly holds the car seat in
place at all times.
6. Use of the Car Seat without
the Built-in Harness
Use of this car seat as a booster without the
built-in harness is meant for a child:

who weighs from 30 to 80 lbs. (14 to 36 kg),
and is between 40 and 54 inches (102 and 138
cm) in height, and
 whose ears are below top of booster seat. If tops
of ears are above top of seat, child is too large
for booster seat.
If your child is between 30 and 40 lbs., he
should continue to use the harness if his shoulders
are below the upper harness slots. We highly
recommend use of the built-in harness up to
40 lbs.
DO NOT use the car seat in this manner with a
lap-only belt.