8.3.1 Light the butane emerging from the burner
tube, adjust the gas flow to the appropriate rate (see 5.3) and allow the flame to stabilize
for at least 2 min.
8.3.2 Position the burner tube axially along the
junction between the seat and back so that the flame is not less than
50 mm from the nearest side edge, or from any marks left by any previous
test, and simultaneously start the clock.
8.3.3 Allow the gas to burn for a period of 20
± 1 s, then terminate by carefully removing the burner tube
from the test pieces.
8.3.4 Observe for flaming or progressive smouldering
(see clause 2) in the interior
and/or cover. Disregard flames, afterglow, smoking or smouldering
that cease within 120 s of the removal of the burner tube.
8.3.5 If flaming or progressive smouldering of
the upholstery components is observed, extinguish the test piece.
Record a fail result for the butane flame ignition source test.
8.3.6 If flaming or progressive smouldering is
not observed, repeat the test at a fresh position, as described in
8.3.2. If flaming or progressive smouldering is not observed in this
retest, record a pass result for the butane flame ignition source
test unless the test piece fails the final examination specified in 8.4. Otherwise extinguish the test piece
and record a fail result.