418 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 25, App. F 

Part V. Test Method To Determine the Smoke 

Emission Characteristics of Cabin Materials 

(a) 

Summary of Method. 

The specimens 

must be constructed, conditioned, and tested 
in the flaming mode in accordance with 
American Society of Testing and Materials 
(ASTM) Standard Test Method ASTM F814– 
83. 

(b) 

Acceptance Criteria. 

The specific optical 

smoke density (D

s

), which is obtained by 

averaging the reading obtained after 4 min-
utes with each of the three specimens, shall 
not exceed 200. 

Part VI—Test Method To Determine the Flam-

mability and Flame Propagation Characteris-
tics of Thermal/Acoustic Insulation Mate-
rials 

Use this test method to evaluate the flam-

mability and flame propagation characteris-
tics of thermal/acoustic insulation when ex-
posed to both a radiant heat source and a 
flame. 

(a) 

Definitions. 

‘‘Flame propagation’’ means the furthest 

distance of the propagation of visible flame 
towards the far end of the test specimen, 
measured from the midpoint of the ignition 
source flame. Measure this distance after 
initially applying the ignition source and be-
fore all flame on the test specimen is extin-
guished. The measurement is not a deter-
mination of burn length made after the test. 

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