Federal Aviation Administration, DOT

Pt. 25, App. F

to the radiant panel surface at this point
must be 7.1-2 inches Section1-8 (191 mm Section3). Prior to
igniting the radiant panel, ensure that the
calorimeter face is clean and that there is
water running through the calorimeter.
(2) Ignite the panel. Adjust the fuel/air
mixture to achieve 1.5 BTUs/ft2-second Section5%
(1.7 Watts/cm2 Section5%) at the  - zero -  position. If
using an electric panel, set the power controller to achieve the proper heat flux. Allow
the unit to reach steady state (this may take

up to 1 hour). The pilot burner must be off
and in the down position during this time.
(3) After steady-state conditions have been
reached, move the calorimeter 2 inches (51
mm) from the  - zero -  position (first hole) to
position 1 and record the heat flux. Move the
calorimeter to position 2 and record the heat
flux. Allow enough time at each position for
the calorimeter to stabilize. Table 1 depicts
typical calibration values at the three positions.

TABLE 1 - CALIBRATION TABLE
BTU-s/ft2sec

Position
 - Zero -  Position ......................................................................................................
Position 1 ...............................................................................................................
Position 2 ...............................................................................................................

spaschal on DSK3GDR082PROD with CFR

(4) Open the bottom door, remove the calorimeter and holder fixture. Use caution as
the fixture is very hot.
(f) Test Procedure. (1) Ignite the pilot burner. Ensure that it is at least 2 inches (51 mm)
above the top of the platform. The burner
must not contact the specimen until the test
begins.
(2) Place the test specimen in the sliding
platform holder. Ensure that the test sample
surface is level with the top of the platform.
At  - zero -  point, the specimen surface must
be 71-2 inches Section1-8 inch (191 mm Section3) below the
radiant panel.
(3) Place the retaining/securing frame over
the test specimen. It may be necessary (due
to compression) to adjust the sample (up or
down) in order to maintain the distance from
the sample to the radiant panel (71-2 inches
Section1-8 inch (191 mmSection3) at  - zero -  position). With
film/fiberglass assemblies, it is critical to

1.5
1.51-1.50-1.49
1.43-1.44

Watts/cm2
1.7
1.71-1.70-1.69
1.62-1.63

make a slit in the film cover to purge any air
inside. This allows the operator to maintain
the proper test specimen position (level with
the top of the platform) and to allow ventilation of gases during testing. A longitudinal
slit, approximately 2 inches (51mm) in
length, must be centered 3 inches Section1-2 inch
(76mmSection13mm) from the left flange of the securing frame. A utility knife is acceptable
for slitting the film cover.
(4) Immediately push the sliding platform
into the chamber and close the bottom door.
(5) Bring the pilot burner flame into contact with the center of the specimen at the
 - zero -  point and simultaneously start the
timer. The pilot burner must be at a 27Section
angle with the sample and be approximately
1-2 inch (12 mm) above the sample. See figure
7. A stop, as shown in figure 8, allows the operator to position the burner correctly each
time.

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