14 CFR Ch. I (1-1-19 Edition)

(6) Leave the burner in position for 15 seconds and then remove to a position at least
2 inches (51 mm) above the specimen.
(g) Report. (1) Identify and describe the
test specimen.
(2) Report any shrinkage or melting of the
test specimen.
(3) Report the flame propagation distance.
If this distance is less than 2 inches, report
this as a pass (no measurement required).
(4) Report the after-flame time.
(h) Requirements. (1) There must be no
flame propagation beyond 2 inches (51 mm)

to the left of the centerline of the pilot
flame application.
(2) The flame time after removal of the
pilot burner may not exceed 3 seconds on any
specimen.
Part VII - Test Method To Determine the
Burnthrough Resistance of Thermal/Acoustic
Insulation Materials
Use the following test method to evaluate
the burnthrough resistance characteristics
of aircraft thermal/acoustic insulation materials when exposed to a high intensity open
flame.

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Pt. 25, App. F