426 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 25, App. F 

first hole to the radiant panel and the dis-
tance between holes is the same as described 
in this paragraph. 

(9) 

Instrumentation. 

Provide a calibrated re-

cording device with an appropriate range or 
a computerized data acquisition system to 
measure and record the outputs of the calo-
rimeter and the thermocouple. The data ac-
quisition system must be capable of record-
ing the calorimeter output every second dur-
ing calibration. 

(10) 

Timing device. 

Provide a stopwatch or 

other device, accurate to 

±

1 second/hour, to 

measure the time of application of the pilot 
burner flame. 

(c) 

Test specimens. 

(1) 

Specimen preparation. 

Prepare and test a minimum of three test 
specimens. If an oriented film cover material 
is used, prepare and test both the warp and 
fill directions. 

(2) 

Construction. 

Test specimens must in-

clude all materials used in construction of 
the insulation (including batting, film, 
scrim, tape etc.). Cut a piece of core material 
such as foam or fiberglass, and cut a piece of 
film cover material (if used) large enough to 
cover the core material. Heat sealing is the 
preferred method of preparing fiberglass 
samples, since they can be made without 
compressing the fiberglass (‘‘box sample’’). 
Cover materials that are not heat sealable 
may be stapled, sewn, or taped as long as the 

cover material is over-cut enough to be 
drawn down the sides without compressing 
the core material. The fastening means 
should be as continuous as possible along the 
length of the seams. The specimen thickness 
must be of the same thickness as installed in 
the airplane. 

(3) 

Specimen Dimensions. 

To facilitate prop-

er placement of specimens in the sliding 
platform housing, cut non-rigid core mate-
rials, such as fiberglass, 12

1

⁄

2

inches (318mm) 

wide by 23 inches (584mm) long. Cut rigid 
materials, such as foam, 11

1

⁄

2

±

1

⁄

4

inches (292 

mm 

±

6mm) wide by 23 inches (584mm) long in 

order to fit properly in the sliding platform 
housing and provide a flat, exposed surface 
equal to the opening in the housing. 

(d) 

Specimen conditioning. 

Condition the 

test specimens at 70 

±

5 

°

F (21 

±

2 

°

C) and 55% 

±

10% relative humidity, for a minimum of 24 

hours prior to testing. 

(e) 

Apparatus Calibration. 

(1) With the slid-

ing platform out of the chamber, install the 
calorimeter holding frame. Push the plat-
form back into the chamber and insert the 
calorimeter into the first hole (‘‘zero’’ posi-
tion). 

See 

figure 7. Close the bottom door lo-

cated below the sliding platform. The dis-
tance from the centerline of the calorimeter 

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