Federal Aviation Administration, DOT

Pt. 25, App. F

spaschal on DSK3GDR082PROD with CFR

(5) If the calorimeter and thermocouples do
not read within range, repeat steps in paragraphs 1 through 4 and adjust the burner air
intake damper until the proper readings are
obtained. The thermocouple rake and the
calorimeter should be used frequently to
maintain and record calibrated test parameters. Until the specific apparatus has demonstrated consistency, each test should be
calibrated. After consistency has been confirmed, several tests may be conducted with
the pre-test calibration before and a calibration check after the series.
(g) Test Procedure. The flammability of
each set of specimens must be tested as follows:
(1) Record the weight of each set of seat
bottom and seat back cushion specimens to
be tested to the nearest 0.02 pound (9 grams).
(2) Mount the seat bottom and seat back
cushion test specimens on the test stand as
shown in Figure 2, securing the seat back
cushion specimen to the test stand at the
top.
(3) Swing the burner into position and ensure that the distance from the exit of the
burner cone to the side of the seat bottom
cushion specimen is 4 Section1-8 inches (102 Section3 mm).
(4) Swing the burner away from the test
position. Turn on the burner and allow it to

run for 2 minutes to provide adequate
warmup of the burner cone and flame stabilization.
(5) To begin the test, swing the burner into
the test position and simultaneously start
the timing device.
(6) Expose the seat bottom cushion specimen to the burner flame for 2 minutes and
then turn off the burner. Immediately swing
the burner away from the test position. Terminate test 7 minutes after initiating cushion exposure to the flame by use of a gaseous
extinguishing agent (i.e., Halon or CO2).
(7) Determine the weight of the remains of
the seat cushion specimen set left on the
mounting stand to the nearest 0.02 pound (9
grams) excluding all droppings.
(h) Test Report. With respect to all specimen sets tested for a particular seat cushion
for which testing of compliance is performed,
the following information must be recorded:
(1) An identification and description of the
specimens being tested.
(2) The number of specimen sets tested.
(3) The initial weight and residual weight
of each set, the calculated percentage weight
loss of each set, and the calculated average
percentage weight loss for the total number
of sets tested.
(4) The burn length for each set tested.

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