Pt. 25, App. F

14 CFR Ch. I (1-1-19 Edition)

spaschal on DSK3GDR082PROD with CFR

be positioned at a depth of 3.75 inches (95
mm) from the tip of the fuel nozzle. The stator must also be positioned such that the integral igniters are located at an angle midway between the 10 and 11 o-clock position,
when viewed looking into the draft tube.
Minor deviations to the igniter angle are acceptable if the temperature and heat flux requirements 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
Section3 mm) burner extension cone at the end of
the draft tube. The cone must have an opening 6 Section0.125-inch (152 Section3 mm) high and 11
Section0.125-inch (280 Section3 mm) wide (see figure 3).

(vi) Fuel. Use JP-8, Jet A, or their international equivalent, at a flow rate of 6.0 Section0.2
gal/hr (0.378 Section0.0126 L/min). If this fuel is unavailable, ASTM K2 fuel (Number 2 grade
kerosene) or ASTM D2 fuel (Number 2 grade
fuel oil or Number 2 diesel fuel) are acceptable if the nominal fuel flow rate, temperature, 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/in2 (0.71
MPa) for a nominally rated 6.0 gal/hr 80Section
spray angle nozzle (such as a PL type) delivers 6.0 Section0.2 gal/hr (0.378 Section0.0126 L/min).

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