FED-STD-228A
4.3 The burner shall be adjusted to produce a flame 5 inches high and an inner blue cone 1.5 inches
high. The burner mounted on the 20° angle block shall be placed against the jig in front of the specimen
so that the vertical plane through the stem of the burner passes through the axis of the specimen. The jig
shall be adjusted so that there is a distance of 1.5 inches between the tip of the burner stem and the
surface of the specimen, as measured along the axis of the burner stem. The height of the specimen
shall be adjusted so that the point of contact with the flame shall be not less than 3 inches from the lower
end of the specimen.
4.4 The pilot of the burner shall be lighted. The valve supplying the fuel gas to the burner shall be
opened and the flame automatically applied to the specimen for 15 seconds and then the valve closed for
15 seconds. This operation shall be repeated 4 additional times.
4.5 At the end of the fifth application of the flame the percent of the extended portion of the indicator
paper which is burned shall be estimated and recorded. The duration of the burning period of the
specimen after the fifth application of the flame shall be observed and the valve recorded.
5. RESULTS
5.1 Unless otherwise specified in the detail specification, one specimen from each inspection unit shall
be tested.
5.2 The flammability of the fibrous covering, insulation, or sheath of the inspection unit shall be the result
obtained from the specimen tested.
5.2.1 When more than one specimen is tested, the flammability of the fibrous covering of the insulation or
sheath of the inspection unit shall be the average of the results obtained from the specimens tested.
5.3 The duration of the burning of the inspection unit after final application of the flame shall be recorded
to the nearest second.
5.4 The amount of the extended portion of the indicator paper that burned from the inspection unit shall
be recorded to the nearest 5 percent.
157
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business