553 

Federal Aviation Administration, DOT 

Pt. 25, App. F 

maintain and record calibrated test param-
eters. Until the specific apparatus has dem-
onstrated consistency, each test should be 
calibrated. After consistency has been con-
firmed, several tests may be conducted with 
the pre-test calibration before and a calibra-
tion check after the series. 

(g) 

Test Procedure. The flammability of 

each set of specimens must be tested as fol-
lows: 

(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 en-

sure that the distance from the exit of the 
burner cone to the side of the seat bottom 
cushion specimen is 4 

±

1

⁄

8

inches (102 

±

3 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 sta-
bilization. 

(5) To begin the test, swing the burner into 

the test position and simultaneously start 
the timing device. 

(6) Expose the seat bottom cushion speci-

men to the burner flame for 2 minutes and 
then turn off the burner. Immediately swing 
the burner away from the test position. Ter-
minate test 7 minutes after initiating cush-
ion exposure to the flame by use of a gaseous 
extinguishing agent (i.e., Halon or CO

2

). 

(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 speci-

men 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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