FED-STD-228A
4.4 Distance of flame travel. Immediately after ignition has occurred, 4.3, the electrical supply to the
spark plugs shall be turned off and the plugs shifted away from the flame. The maximum distance which
the flame travels along the surface of the specimen before extinction shall be measured from the top of
the heater coil and recorded as the distance which the flame travels.
4.5 Time required for self-extinction. The time, in seconds, that the specimen continues to burn after the
current is cut off in the heater coil until the cessation of all flaming shall be recorded as the time of self-
extinction.
5. RESULTS
5.1 One specimen from each inspection unit shall be tested.
5.1.1 The flammability of the inspection unit shall be the results obtained from the specimen tested.
5.2 If the results from one specimen fail to meet the specified requirements, four additional specimens
shall be tested.
5.2.1 The flammability of the inspection unit shall be the average of the results obtained from the five
specimens tested.
5.3 The time required for the ignition of the inspection unit shall be recorded to the nearest second.
5.4 The time required for self-extinction of the inspection unit shall be recorded to the nearest second.
5.5 The distance the flame travels along the inspection unit shall be recorded to the nearest 1/8 inch.
5.6 The time of heating shall be recorded.
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