spaschal on DSK3GDR082PROD with CFR

Pt. 25, App. F

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

(c) Test Specimens. (1) For each test, one set
of cushion specimens representing a seat bottom and seat back cushion must be used.
(2) The seat bottom cushion specimen must
be 18 Section1-8 inches (457 Section3 mm) wide by 20 Section1-8
inches (508 Section3 mm) deep by 4 Section1-8 inches (102
Section3 mm) thick, exclusive of fabric closures
and seam overlap.
(3) The seat back cushion specimen must
be 18 Section1-8 inches (432 Section3 mm) wide by 25 Section1-8
inches (635 Section3 mm) high by 2 Section1-8 inches (51 Section3
mm) thick, exclusive of fabric closures and
seam overlap.
(4) The specimens must be conditioned at
70 Section5 SectionF (21 Section2 SectionC) 55%Section10% relative humidity
for at least 24 hours before testing.
(d) Test Apparatus. The arrangement of the
test apparatus is shown in Figures 1 through
5 and must include the components described
in this section. Minor details of the apparatus may vary, depending on the model
burner used.
(1) Specimen Mounting Stand. The mounting
stand for the test specimens consists of steel
angles, as shown in Figure 1. The length of
the mounting stand legs is 12 Section1-8 inches (305
Section3 mm). The mounting stand must be used
for mounting the test specimen seat bottom
and seat back, as shown in Figure 2. The
mounting stand should also include a suitable drip pan lined with aluminum foil, dull
side up.
(2) Test Burner. The burner to be used in
testing must - 
(i) Be a modified gun type;
(ii) Have an 80-degree spray angle nozzle
nominally rated for 2.25 gallons/hour at 100
psi;
(iii) Have a 12-inch (305 mm) burner cone
installed at the end of the draft tube, with
an opening 6 inches (152 mm) high and 11
inches (280 mm) wide, as shown in Figure 3;
and
(iv) Have a burner fuel pressure regulator
that is adjusted to deliver a nominal 2.0 gallon/hour of # 2 Grade kerosene or equivalent
required for the test.
Burner models which have been used successfully in testing are the Lennox Model OB-32,
Carlin Model 200 CRD, and Park Model DPL
3400. FAA published reports pertinent to this
type
of
burner
are:
(1)
Powerplant
Enginering Report No. 3A, Standard Fire
Test Apparatus and Procedure for Flexible
Hose Assemblies, dated March 1978; and (2)
Report No. DOT/FAA/RD/76/213, Reevaluation
of Burner Characteristics for Fire Resistance
Tests, dated January 1977.
(3) Calorimeter.
(i) The calorimeter to be used in testing
must be a (0-15.0 BTU/ft2-sec. 0-17.0 W/cm2)
calorimeter, accurate Section3%, mounted in a 6inch by 12-inch (152 by 305 mm) by 3-4-inch (19
mm) thick calcium silicate insulating board
which is attached to a steel angle bracket for
placement in the test stand during burner
calibration, as shown in Figure 4.

(ii) Because crumbling of the insulating
board with service can result in misalignment of the calorimeter, the calorimeter
must be monitored and the mounting
shimmed, as necessary, to ensure that the
calorimeter face is flush with the exposed
plane of the insulating board in a plane parallel to the exit of the test burner cone.
(4) Thermocouples. The seven thermocouples
to be used for testing must be 1-16- to 1-8-inch
metal sheathed, ceramic packed, type K,
grounded thermocouples with a nominal 22
to 30 American wire gage (AWG)-size conductor. The seven thermocouples must be attached to a steel angle bracket to form a
thermocouple rake for placement in the test
stand during burner calibration, as shown in
Figure 5.
(5) Apparatus Arrangement. The test burner
must be mounted on a suitable stand to position the exit of the burner cone a distance of
4 Section1-8 inches (102 Section3 mm) from one side of the
specimen mounting stand. The burner stand
should have the capability of allowing the
burner to be swung away from the specimen
mounting stand during warmup periods.
(6) Data Recording. A recording potentiometer or other suitable calibrated instrument
with an appropriate range must be used to
measure and record the outputs of the calorimeter and the thermocouples.
(7) Weight Scale. Weighing Device - A device
must be used that with proper procedures
may determine the before and after test
weights of each set of seat cushion specimens
within 0.02 pound (9 grams). A continuous
weighing system is preferred.
(8) Timing Device. A stopwatch or other device (calibrated to Section1 second) must be used to
measure the time of application of the burner flame and self-extinguishing time or test
duration.
(e) Preparation of Apparatus. Before calibration, all equipment must be turned on and
the burner fuel must be adjusted as specified
in paragraph (d)(2).
(f) Calibration. To ensure the proper thermal output of the burner, the following test
must be made:
(1) Place the calorimeter on the test stand
as shown in Figure 4 at a distance of 4 Section1-8
inches (102 Section3 mm) from the exit of the burner cone.
(2) Turn on the burner, allow it to run for
2 minutes for warmup, and adjust the burner
air intake damper to produce a reading of
10.5 Section0.5 BTU/ft2-sec. (11.9 Section0.6 w/cm2) on the
calorimeter to ensure steady state conditions have been achieved. Turn off the burner.
(3) Replace the calorimeter with the thermocouple rake (Figure 5).
(4) Turn on the burner and ensure that the
thermocouples are reading 1900 Section100 SectionF (1038
Section38 SectionC) to ensure steady state conditions
have been achieved.

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