575 

Federal Aviation Administration, DOT 

Pt. 25, App. F 

‘‘Radiant heat source’’ means an electric 

or air propane panel. 

‘‘Thermal/acoustic insulation’’ means a 

material or system of materials used to pro-
vide thermal and/or acoustic protection. Ex-
amples include fiberglass or other batting 

material encapsulated by a film covering and 
foams. 

‘‘Zero point’’ means the point of applica-

tion of the pilot burner to the test specimen. 

(b) 

Test apparatus. 

(1) 

Radiant panel test chamber. Conduct 

tests in a radiant panel test chamber (see 
figure 1 above). Place the test chamber under 
an exhaust hood to facilitate clearing the 
chamber of smoke after each test. The radi-
ant panel test chamber must be an enclosure 
55 inches (1397 mm) long by 19.5 (495 mm) 
deep by 28 (710 mm) to 30 inches (maximum) 
(762 mm) above the test specimen. Insulate 
the sides, ends, and top with a fibrous ce-
ramic insulation, such as Kaowool M

TM

 

board. On the front side, provide a 52 by 12- 
inch (1321 by 305 mm) draft-free, high-tem-
perature, glass window for viewing the sam-
ple during testing. Place a door below the 

window to provide access to the movable 
specimen platform holder. The bottom of the 
test chamber must be a sliding steel plat-
form that has provision for securing the test 
specimen holder in a fixed and level position. 
The chamber must have an internal chimney 
with exterior dimensions of 5.1 inches (129 
mm) wide, by 16.2 inches (411 mm) deep by 13 
inches (330 mm) high at the opposite end of 
the chamber from the radiant energy source. 
The interior dimensions must be 4.5 inches 
(114 mm) wide by 15.6 inches (395 mm) deep. 
The chimney must extend to the top of the 
chamber (see figure 2). 

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