F-16AtomizerTestInstruction.pdf.pdf

T.O. 2JA3-57-3

CHAPTER 7

ACCESSORIES

7.1 GENERAL.

This chapter contains applicable inspection, repair/replacement, and test instructions for the JFS accessories.

7.2 INSPECTION.

7.2.1 Fuel Manifold Assembly. Inspect fuel manifold

assembly (Figure 3-1, 36) as follows:

a. Visually inspect manifold flange for markings (H or H2). Reference Figure 5-2.1.

b. Visually inspect for B-nut thread damage.

c. Visually inspect for cracked brazed joints between tubes or at distribution boss.

d. Visually inspect bent, dented or nicked tubes.

e. Visually inspect orifices for clogged tubes or clogged outlet tips.

f. Visually inspect for overall cleanliness of fuel manifold assembly.

7.2.2 Start Fuel Nozzle. Inspect start fuel nozzle

(Figure 3-1, 40) as follows:

a. Visually inspect for thread damage.

b. Visually inspect nozzle filter for debris or damage.

c. Visually inspect for overall cleanliness of start fuel nozzle.

d. Ensure spray angle is properly marked on nozzle.

7.3 FUEL MANIFOLD ASSEMBLY REPAIR OR

REPLACEMENT.

Repair fuel manifold assembly (Figure 3-1, 36) as follows:

a. Wire brush or buff repair area by hand until bright and clean.

b. If orifice in outlet tip (injector) is clogged, it must be increased in size to meet fuel flow requirements;

slightly enlarge orifice using a pin reamer. The nominal orifice size in each injector is 0.018-inch diameter.

7.4 FUEL MANIFOLD ASSEMBLY TEST

INSTRUCTIONS.

Test fuel manifold assembly (Figure 3-1, 36) as follows:

a. Install fuel manifold assembly (36) in pressure test fixture, connect to fuel manifold flow bench or equivalent. Connect pressure line to distribution boss of fuel manifold assembly (36).

b. Use calibrating fluid for test.

c. Apply 100 to 110 psig fluid pressure in 170 (±10) pph to distribution boss and note which beaker fills first. Consider this the pilot beaker for next step.

Reduce pressure to zero.

d. Empty beaker and reposition under injectors.

Apply pressure and record elapsed time for pilot beaker to fill.

e. Calculate total flow (V) by adding flows to each injector. V T = V1 + V 2 + V3 + V 4 + V5 + V 6.

f. Divide total flow (VT) by 6 to find average flow (Va).

g. Determine if variation in injector flow is accept-able. Using lowest flow of V1, V2, V 3, V4, V 5 and V6 as (V L) and the highest flow as (V H), calculate variations from average flow V as follows:

h. If calculated variations are below 0.96 or above 1.04, fuel manifold assembly (36) requires rework.

Change 17 7-1

i. Determine fuel flow rate by dividing total flow VT (4) Visually inspect for overall cleanliness of start by the time recorder in step d. Flow rate shall be fuel nozzle.

1565 to 1858 ml per minute. If less than 1565 ml

b. Test start fuel nozzle as follows:per minute, rework fuel manifold assembly (36). If greater than 1858 ml per minute, condemn fuel

(1) Install start fuel nozzle (40) on flow checkmanifold assembly.

fixture ST92300 or suitable atomizer test stand.

Use calibrating fluid for test. Maintain fluidj. If variation in flow from any of the injectors is temperature of 70 to 90°F.greater than 1.04, slightly enlarge the size of each injector orifice within a variation closest to 0.96.

(2) Apply 100 (±2) psig fluid pressure to start fuel nozzle. The spray angle must be 100 degreesk. Using pin reamer, enlarge injector orifice slightly.

minimum.Normal injector orifice size is 0.018-inch diameter.

(3) Raise fluid pressure to 200 (±2) psig to start fuell. Repeat steps a. through i. to determine if flow is nozzle and hold momentarily.acceptable. If flow is still not within limits, repeat step j. and then steps a. through i. until flow is

(4) Raise fluid pressure to 350 (±2) psig to start fuelacceptable.

nozzle and allow to stabilize for 1 minute.

7.5 START FUEL NOZZLE TEST PROCEDURES. (5) Observe spray pattern from start fuel nozzle.

Spray shall be finely atomized, conical and

Test start fuel nozzle (Figure 3-1, 40) as follows: symmetrical, free of voids and streaks, with spray of 80 degree minimum and a flow rate ofa. Inspect start fuel nozzle as follows:

14 to 16 pounds per hour. (See Figure 7-1.)

NOTE (6) If start fuel nozzle does not conform to step (5), visually inspect nozzle for obstructions.

Ensure start fuel nozzles are properly cleaned. Ultrasonic clean if necessary and repeat test. If No debris contaminants or obstructions are item still does not conform to step (5), reject.

allowed. Failure to comply may cause nozzle spray angle to streak or spray intermittently. (7) If start fuel nozzle has spray angle below 80 degrees, condemn.

(1) If necessary, ultrasonic soap clean start fuel nozzle for 45 minutes. Ultrasonic rinse for 5 (8) If start fuel nozzle is acceptable at 350 psig, minutes or dip rinse or hot water rinse. Air blast then electro etch the spray angle and initials SA dry. on the side of nozzle.

(2) Visually inspect for thread damage. c. Properly preserve, individually package, and seal each accepted start fuel nozzle.

(3) Visually inspect nozzle filter for debris, obstruc-tion or damage.

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Figure 7-1. Start Fuel Nozzle Test

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2JA3-57-3