423 

Federal Aviation Administration, DOT 

Pt. 25, App. F 

(ii) Attach a 

1

⁄

2

inch (13 mm) piece of 

Kaowool M

TM

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 must 
not impede the sliding platform movement 
(in and out of the test chamber). If the plat-
form has been fabricated such that the back 
side of the platform is high enough to pre-
vent excess 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 5. 

VerDate Sep<11>2014 

12:50 Apr 30, 2019

Jkt 247046

PO 00000

Frm 00433

Fmt 8010

Sfmt 8002

Y:\SGML\247046.XXX

247046

ER31JY03.007</GPH>

spaschal on DSK3GDR082PROD with CFR