page-209

403

Federal Aviation Administration, DOT

Pt. 25, App. F

(b)

Summary of Method.

This method pro-

vides a laboratory test procedure for meas-
uring the capability of cargo compartment
lining materials to resist flame penetration
with a 2 gallon per hour (GPH) #2 Grade ker-
osene or equivalent burner fire source. Ceil-
ing and sidewall liner panels may be tested
individually provided a baffle is used to sim-
ulate the missing panel. Any specimen that
passes the test as a ceiling liner panel may
be used as a sidewall liner panel.

(c)

Test Specimens.

(1) The specimen to be

tested must measure 16

⁄

inches (406

mm) by 24 +

⁄

inches (610

3 mm).

(2) The specimens must be conditioned at

F. (21

C.) and 55%

5% humid-

ity for at least 24 hours before testing.

(d)

Test Apparatus.

The arrangement of the

test apparatus, which is shown in Figure 3 of
Part II and Figures 1 through 3 of this part
of appendix F, must include the components
described in this section. Minor details of the
apparatus may vary, depending on the model
of the burner used.

(1)

Specimen Mounting Stand.

The mounting

stand for the test specimens consists of steel
angles as shown in Figure 1.

(2)

Test Burner.

The burner to be used in

tesing must—

(i) Be a modified gun type.
(ii) Use a suitable nozzle and maintain fuel

pressure to yield a 2 GPH fuel flow. For ex-
ample: an 80 degree nozzle nominally rated
at 2.25 GPH and operated at 85 pounds per
square inch (PSI) gage to deliver 2.03 GPH.

(iii) Have a 12 inch (305 mm) burner exten-

sion 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 of Part II of this appendix.

(iv) Have a burner fuel pressure regulator

that is adjusted to deliver a nominal 2.0 GPH
of #2 Grade kerosene or equivalent.

Burner models which have been used success-
fully in testing are the Lenox Model OB–32,
Carlin Model 200 CRD and Park Model DPL.
The basic burner is described in FAA Power-
plant Engineering Report No. 3A, Standard
Fire Test Apparatus and Procedure for Flexi-
ble Hose Assemblies, dated March 1978; how-
ever, the test settings specified in this ap-
pendix differ in some instances from those
specified in the report.

(3)

Calorimeter.

(i) The calorimeter to be

used in testing must be a total heat flux Foil
Type Gardon Gage of an appropriate range
(approximately 0 to 15.0 British thermal unit
(BTU) per ft.

sec., 0–17.0 watts/cm

). The cal-

orimeter must be mounted in a 6 inch by 12
inch (152 by 305 mm) by

⁄

inch (19 mm) thick

insulating block which is attached to a steel
angle bracket for placement in the test stand
during burner calibration as shown in Figure
2 of this part of this appendix.

(ii) The insulating block must be mon-

itored for deterioration and the mounting
shimmed as necessary to ensure that the cal-

orimeter face is parallel to the exit plane of
the test burner cone.

(4)

Thermocouples.

The seven thermocouples

to be used for testing must be

⁄

inch ce-

ramic sheathed, type K, grounded
thermocouples with a nominal 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 burn-
er calibration as shown in Figure 3 of this
part of this appendix.

(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
8 inches from the ceiling liner panel and 2
inches from the sidewall liner panel. The
burner stand should have the capability of
allowing the burner to be swung away from
the test specimen during warm-up periods.

(6)

Instrumentation.

A recording potentiom-

eter or other suitable instrument with an ap-
propriate range must be used to measure and
record the outputs of the calorimeter and
the thermocouples.

(7)

Timing Device.

A stopwatch or other de-

vice must be used to measure the time of
flame application and the time of flame pen-
etration, if it occurs.

(e)

Preparation of Apparatus.

Before calibra-

tion, all equipment must be turned on and
allowed to stabilize, and the burner fuel flow
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) Remove the burner extension from the

end of the draft tube. Turn on the blower
portion of the burner without turning the
fuel or igniters on. Measure the air velocity
using a hot wire anemometer in the center of
the draft tube across the face of the opening.
Adjust the damper such that the air velocity
is in the range of 1550 to 1800 ft./min. If tabs
are being used at the exit of the draft tube,
they must be removed prior to this measure-
ment. Reinstall the draft tube extension
cone.

(2) Place the calorimeter on the test stand

as shown in Figure 2 at a distance of 8 inches
(203 mm) from the exit of the burner cone to
simulate the position of the horizontal test
specimen.

(3) Turn on the burner, allow it to run for

2 minutes for warm-up, and adjust the damp-
er to produce a calorimeter reading of 8.0

0.5

BTU per ft.

sec. (9.1

0.6 Watts/cm

(4) Replace the calorimeter with the ther-

mocouple rake (see Figure 3).

(5) Turn on the burner and ensure that

each of the seven thermocouples reads 1700

100

F. (927

C.) to ensure steady

state conditions have been achieved. If the
temperature is out of this range, repeat steps
2 through 5 until proper readings are ob-
tained.

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