Federal Aviation Administration, DOT

Pt. 25, App. F

(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 131-8
inches (584 by 333 mm) with a specimen opening of 19 by 103-4 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 5.

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(ii) Attach a 1-2 inch (13 mm) piece of
Kaowool M TM board or other high temperature material measuring 411-2 by 81-4 inches
(1054 by 210 mm) to the back of the platform.
This board serves as a heat retainer and protects the test specimen from excessive
preheating. The height of this board must
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 excess preheating of the specimen when
the sliding platform is out, a retainer board
is not necessary.