page-202

396

14 CFR Ch. I (1–1–19 Edition)

Pt. 25, App. F

(c)

Test Specimens.

(1) For each test, one set

of cushion specimens representing a seat bot-
tom and seat back cushion must be used.

(2) The seat bottom cushion specimen must

be 18

⁄

inches (457

3 mm) wide by 20

⁄

inches (508

3 mm) deep by 4

⁄

inches (102

3 mm) thick, exclusive of fabric closures

and seam overlap.

(3) The seat back cushion specimen must

be 18

⁄

inches (432

3 mm) wide by 25

⁄

inches (635

3 mm) high by 2

⁄

inches (51

mm) thick, exclusive of fabric closures and
seam overlap.

(4) The specimens must be conditioned at

F (21

C) 55%

10% 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 appa-
ratus 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

⁄

inches (305

3 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 suit-
able 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 gal-
lon/hour of # 2 Grade kerosene or equivalent
required for the test.

Burner models which have been used success-
fully 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/ft

-sec. 0–17.0 W/cm

)

calorimeter, accurate

3%, mounted in a 6-

inch by 12-inch (152 by 305 mm) by

⁄

-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 misalign-
ment 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 par-
allel to the exit of the test burner cone.

(4)

Thermocouples.

The seven thermocouples

to be used for testing must be

⁄

- to

⁄

-inch

metal sheathed, ceramic packed, type K,
grounded thermocouples with a nominal 22
to 30 American wire gage (AWG)-size con-
ductor. The seven thermocouples must be at-
tached 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 posi-
tion the exit of the burner cone a distance of
4

⁄

inches (102

3 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 potentiom-

eter or other suitable calibrated instrument
with an appropriate range must be used to
measure and record the outputs of the calo-
rimeter 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 de-

vice (calibrated to

1 second) must be used to

measure the time of application of the burn-
er flame and self-extinguishing time or test
duration.

(e)

Preparation of Apparatus.

Before calibra-

tion, 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 ther-

mal 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

⁄

inches (102

3 mm) from the exit of the burn-

er 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

0.5 BTU/ft

-sec. (11.9

0.6 w/cm

) on the

calorimeter to ensure steady state condi-
tions have been achieved. Turn off the burn-
er.

(3) Replace the calorimeter with the ther-

mocouple rake (Figure 5).

(4) Turn on the burner and ensure that the

thermocouples are reading 1900

100

F (1038

C) to ensure steady state conditions

have been achieved.

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