432 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 25, App. F 

be positioned at a depth of 3.75 inches (95 
mm) from the tip of the fuel nozzle. The sta-
tor must also be positioned such that the in-
tegral igniters are located at an angle mid-
way between the 10 and 11 o’clock position, 
when viewed looking into the draft tube. 
Minor deviations to the igniter angle are ac-
ceptable if the temperature and heat flux re-
quirements conform to the requirements of 
paragraph VII(e) of this appendix. 

(iv) 

Blower Fan. 

The cylindrical blower fan 

used to pump air through the burner must 
measure 5.25 inches (133 mm) in diameter by 
3.5 inches (89 mm) in width. 

(v) 

Burner cone. 

Install a 12 + 0.125-inch (305 

±

3 mm) burner extension cone at the end of 

the draft tube. The cone must have an open-
ing 6 

±

0.125-inch (152 

±

3 mm) high and 11 

±

0.125-inch (280 

±

3 mm) wide (see figure 3). 

(vi) 

Fuel. 

Use JP–8, Jet A, or their inter-

national equivalent, at a flow rate of 6.0 

±

0.2 

gal/hr (0.378 

±

0.0126 L/min). If this fuel is un-

available, ASTM K2 fuel (Number 2 grade 
kerosene) or ASTM D2 fuel (Number 2 grade 
fuel oil or Number 2 diesel fuel) are accept-
able if the nominal fuel flow rate, tempera-
ture, and heat flux measurements conform to 
the requirements of paragraph VII(e) of this 
appendix. 

(vii) 

Fuel pressure regulator. 

Provide a fuel 

pressure regulator, adjusted to deliver a 
nominal 6.0 gal/hr (0.378 L/min) flow rate. An 
operating fuel pressure of 100 lb/in

2

(0.71 

MPa) for a nominally rated 6.0 gal/hr 80

° 

spray angle nozzle (such as a PL type) deliv-
ers 6.0 

±

0.2 gal/hr (0.378 

±

0.0126 L/min). 

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