349
Federal Aviation Administration, DOT
Pt. 23, App. F
panel fuel. The panel fuel system must con-
sist of a venturi-type aspirator for mixing
gas and air at approximately atmospheric
pressure. Provide suitable instrumentation
for monitoring and controlling the flow of
fuel and air to the panel. Include an air flow
gauge, an air flow regulator, and a gas pres-
sure gauge.
(iii)
Radiant panel placement. Mount the
panel in the chamber at 30 degrees to the
horizontal specimen plane, and 7
1
⁄
2
inches
above the zero point of the specimen.
(3)
Specimen holding system.
(i) The sliding platform serves as the hous-
ing for test specimen placement. Brackets
may be attached (via wing nuts) to the top
lip of the platform in order to accommodate
various thicknesses of test specimens. Place
the test specimens on a sheet of Kaowool
MTM board or 1260 Standard Board (manu-
factured by Thermal Ceramics and available
in Europe), or equivalent, either resting on
the bottom lip of the sliding platform or on
the base of the brackets. It may be necessary
to use multiple sheets of material based on
the thickness of the test specimen (to meet
the sample height requirement). Typically,
these non-combustible sheets of material are
available in
1
⁄
4
-inch (6 mm) thicknesses. See
figure F4. A sliding platform that is deeper
than the 2-inch (50.8mm) platform shown in
figure F4 is also acceptable as long as the
sample height requirement is met.
(ii) Attach a
1
⁄
2
-inch (13 mm) piece of
Kaowool MTM board or other high tempera-
ture material measuring 41
1
⁄
2
by 8
1
⁄
4
inches
(1054 by 210 mm) to the back of the platform.
This board serves as a heat retainer and pro-
tects the test specimen from excessive
preheating. The height of this board may not
impede the sliding platform movement (in
and out of the test chamber). If the platform
has been fabricated such that the back side
of the platform is high enough to prevent ex-
cess preheating of the specimen when the
sliding platform is out, a retainer board is
not necessary.
(iii) Place the test specimen horizontally
on the non-combustible board(s). Place a
steel retaining/securing frame fabricated of
mild steel, having a thickness of
1
⁄
8
-inch (3.2
mm) and overall dimensions of 23 by 13
1
⁄
8
inches (584 by 333 mm) with a specimen open-
ing of 19 by 10
3
⁄
4
inches (483 by 273 mm) over
the test specimen. The front, back, and right
portions of the top flange of the frame must
rest on the top of the sliding platform, and
the bottom flanges must pinch all 4 sides of
the test specimen. The right bottom flange
must be flush with the sliding platform. See
figure F5.
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