C-130FuelControl-9__TestInstruction.pdf.pdf

TO 2G-GTCP85-43-9

WP 006 00

OO-MAN-2015-00149

Make the following changes to Figure 12. Cord Assembly – Installation

Insert Table 3 before Section “9. Testing” and after paragraph 8.g.23.

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Replace section “9. Testing” in TO 2G-GTCP85-43-9 in its entirety with the following:

9. TESTING, Model Number: 3603100-1/-2/-9

NOTE

Refer to T.M. SE-876-03-1053 for operation and maintenance of 281600-7-1/281600-7-1-P1 test stand assembly.

a. Depreservation (If necessary)

CAUTION

Do not contaminate the calibration fluid in the test stand with preservation fluid removed from fuel control unit.

WARNING

Fuel and calibration fluid (43-44A) are toxic to the eyes, skin, and respiratory tract. Eye and skin protection required. Use only in a well-ventilated area.

(1) Plug all ports in fuel system except fuel-pump inlet and fuel-control discharge. Apply 24 to 28 Vdc to solenoid to open solenoid. Supply a source of fuel or calibration fluid to the fuel-pump inlet at a pressure of 5 to 25 psig. Operate pump at 200 to 500 rpm until all oil has been removed from fuel control unit and discharge stream contains pure calibration fluid.

b. Preparation for Test

(1) Use 281600-7-1/281600-7-1-P1 test stand assembly or provide a test setup using items (Figure 24, 1 through 14) that are capable of running the unit to the input parameters and output measurements specified in Table 6, using instrumentation capable of meeting the accuracy requirements of Table 4, and also capable of producing the required back-pressures of Table 5.

(2) Service test stand assembly using calibration fluid (43-44A).

(3) Install fuel control unit with filter element down, on mounting pad of test stand assembly, checking mesh of fuel control unit drive shaft with drive shaft splines of test stand assembly. Ensure input shaft will turn in a clockwise direction when viewing from input shaft end. Attach the fuel control unit to the test stand using all 4 mounting holes in the fuel pump housing (Figure 14, 101).

(4) Hook up fuel control unit, as required, to meet parameters specified in Tables 4, 5, and 6.

(5) Maintain a complete and accurate record of test run.

(6) Refer to paragraph “11 Troubleshooting” for aid in correcting problems encountered during testing.

c. Fuel Leakage Check

(1) Throughout the entire testing procedure there shall be no fuel leaking from the acceleration port, any adjusting screw seals, or from mating joints – at any time. If fuel leakage rates in the input drive shaft cavity or out of the drain port exceed one drop in 5 minutes, reject the unit.

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d. General Test Instructions

(1) Testing sequences, input and output limits, and run parameters are contained in Table 6. Refer to Table 6 for all references to data point values.

For each operating sequence the input parameters shall be applied to the fuel control unit in the following order: fuel inlet pressure, input driveshaft speed, inlet air pressure.

(2) All testing operations shall be accomplished sequentially in the numerical order they appear within the testing instructions. It is not necessary to de-energize the fuel control unit between testing sequences. If a test section needs to be repeated, start at the previous sections final condition.

(3) All references to pump discharge pressure shall be interpreted to apply to those pressures coming out of the governor section of the fuel control unit. All references to nozzle discharge pressure shall be interpreted to apply to those pressures coming out of the electric solenoid.

(4) The electric solenoid is a normally closed device. Apply 24 to 28 Vdc to open, or energize, the solenoid. See Figure 25, Detail A for solenoid wiring diagram.

(5) For all testing sequences, the fuel discharge pressure shall be the sum of the nozzle back pressure curve and additional pressure equal to the air pressure applied to the acceleration limiter valve. This may be accomplished via an air controlled regulator connected to the air input and situated after the nozzle discharge simulator or by adding additional back pressure equal to air input to the back pressure curve at each testing sequence.

Type of

Measurement Application

Test Requirement

(Actual)

Gage Requirement

(Minimum)

Accuracy

(Minimum)

Angular Velocity Input Driveshaft Speed 800-4265 rpm 0-5000 rpm ±2 rpm

Inlet Air Pressure (Acceleration Limiter Valve, Air Inlet) 34-41 psig 0-60 psig ±2 psig

Nozzle Discharge Air Pressure (Back Pressure) 34-41 psig 0-60 psig ±2 psig

Fuel Inlet Pressure 1-27 psig 0-30 psig ±1 psig

Nozzle Discharge Pressure 15-310 psig 0-575 psig ±5 psig

Pump Discharge Pressure 58-62 psig 0-75 psig ±2 psig

Fuel Flow Rate Nozzle Fuel Flow Rate 0-500 pph 0-900 pph ±2 pph

Table 4. Instrument Range and Accuracy Requirements for Fuel Control Unit, Model No. 3603100-2/-9

Air Pressure

Fuel Pressure

e. Test Procedures

Maintain a complete and accurate record of test run. Table 6, or equivalent automated test sheet, may be used for documentation.

(1) Air Leakage Check, Acceleration Limiter Valve

a. Install a pressure gage, with a minimum range of 0 to 60 psig, onto the acceleration limiter drain port. Apply detergent compound (43-34) to all areas where air pressure is contained.

Adjust the input parameters to the settings specified in data point 1.a. If any increasing pressure is read on the gage at the drain port or if any air leaks are detected with the detergent compound, reject the unit. Upon completion, remove the pressure gage and wipe off residual detergent.

WARNING

When disconnecting fuel lines between the fuel control unit and test stand always break connection at the side furthest away from the flow source. Ensure free end of fuel line is pointed in a safe direction before running fuel control unit.

(2) Purging Run (Priming Operation)

a. Disconnect test stand end of the fuel line attached between the governor cap and the test stand. Point free end of fuel line in a safe direction and adjust the input parameters to the settings specified in data point 2.a.

1. Run unit for the time allotted then proceed to data point 2.b. After the fuel flowing through the line begins to discharge in a steady stream reduce driveshaft speed to zero

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rpm then reduce the fuel inlet pressure to zero psig. Reconnect the free end of the fuel line back onto the test stand and proceed to paragraph 9.e.3.

Run-In Schedule (Pump Break-In) is required only when bushings, gears, or housings have been replaced.

CAUTION

Open nozzle bypass valve before each increase in input driveshaft speed to prevent over-pressurization and damage to the fuel control unit.

(3) Run-In Schedule (Pump Break-In)

a. The nozzle discharge pressure shall be adjusted via the nozzle bypass valve. Sequentially operate the fuel control unit at each data point, 3.a through 3.d.

(4) Acceleration Limiter Valve Cracking Pressure/ Crack Pressure Sensitivity

a. Disconnect air line from acceleration limiter and leave acceleration limiter port uncapped.

b. Beginning with the fuel solenoid valve in the closed position, adjust the input parameters to the settings specified in data point 4.a. Cycle (energize/de-energize) solenoid and measure pump discharge pressure. Loosen nut (Figure 21, 22) and adjust the acceleration limiter adjusting screw (29) to obtain the fuel nozzle pressure (crack pressure) specified. Tighten nut (22). Recheck two times by cycling (energize/de-energize) fuel solenoid valve twice.

c. If cracking pressure is unstable, loosen screws (Figure 21, 24), tap acceleration limiter cover

(27) gently until pressure stabilizes. Tighten screws (24) and recheck cracking pressure sensitivity.

d. Sequentially operate the fuel control unit at each subsequent data point within this step (data points 4.b through 4.f). For each fuel inlet pressure setting recheck the crack pressure two times by cycling fuel solenoid valve twice. Ensure the maximum difference between pump discharge pressures for all data points is within limits. Reject the unit if it is unable to reliably meet data point requirements.

e. Reconnect air line to acceleration limiter.

(5) Governor Set Point

a. Adjust the input parameters to the settings specified in data point 5.a. Adjust the governor adjustment screw, as necessary, to obtain the required fuel flow.

b. Remove governor trim box cover (Figure 11, 10).

c. Loosen governor set screw (13).

d. Adjust governor set point to get required flow by moving large gear of gear set (24).

e. Position quadrant (18) at the mid position to pulley (28).

f. Tighten set screw (13).

g. Using suitable tool, lock position of quadrant (18) and pulley (28) to maintain their positions for remaining tests.

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(6) Speed Droop and Hysteresis

NOTE:

Steps requiring adjustment of RPM to achieve specified fuel flow parameters must adjust the RPM to reach max flow point, and continue increasing RPM to achieve specified fuel flow.

a. Adjust the input parameters to the settings specified in data point 6.a.

b. Decrease speed to obtain fuel flow rates as specified in data points 6.b and 6.c; record data at each point.

c. Increase speed to obtain fuel flow rates as specified in data points 6.d and 6.e; record data at each point.

d. Calculate speed droop and hysteresis as instructed.

e. If delta rpm is not within limits, use spring (Figure 23, Sheet 2, 75) with higher pound per inch rate to increase delta rpm or use lower pound per inch rate spring to decrease delta rpm. If spring is replaced, re-perform paragraph 9.e.5 “Governor Set Point”.

(7) Fuel Flow

a. Sequentially operate the fuel control unit at the input parameters listed in data points 7.a through 7.b. Record all data and check condition of solenoid by taking the difference between pump discharge and nozzle discharge pressures, as instructed. Reject the unit if it is unable to meet data point requirements for fuel flow.

(8) Pump Performance

a. Set the fuel control unit to the operating parameters listed in data point 8.a. The nozzle discharge pressure shall be adjusted via the nozzle bypass valve.

b. If the fuel flow is less than that specified in data point 8.a., check the pressure drop across the fuel solenoid valve. If the pressure drop exceeds 40 psi, reject the fuel solenoid valve.

c. Reject the unit if it is unable to meet data point requirements.

d. Open nozzle bypass valve.

(9) Repeatability and Nozzle Pressure Fluctuation

NOTE:

Steps requiring adjustment of RPM to achieve specified fuel flow parameters must adjust the RPM to reach max flow point, and continue increasing RPM to achieve specified fuel flow.

a. Sequentially operate the fuel control unit at the input parameters listed in data points 9.a through 9.g. Record all data. Check repeatability and nozzle pressure fluctuations as instructed.

Reject the unit if it is unable to meet data point requirements.

(10) Acceleration Limiter Valve Cracking Pressure – Recheck

a. Beginning with the fuel solenoid valve in the closed position, set the fuel control unit to the operating parameters listed in data point 10.a. Recheck crack pressure two times by cycling (energize/de-energize) fuel solenoid valve twice. If necessary, reset crack pressure as required and repeat this step.

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b. Lockwire screw (Figure 21, 24) using lockwire (43-51). Repeat Step 9.e.10.a after acceleration limiter valve has been lockwired. Reject the unit if it is unable to meet the data point requirements.

(11) Final Governor Set Point

a. Set the fuel control unit to the operating parameters listed in data point 11.a. If necessary, readjust governor set point as required and repeat this step.

b. Remove tool used to maintain positions of quadrant (Figure 11, 18) and pulley (28).

c. Temporarily reinstall governor trim box cover (10) using one or two screws (Figure 11, 3).

(12) Input Shaft Seal Leakage Check

a. Set the fuel control unit to the operating parameters listed in data point 12.a. The leakage rate from the fuel control input drive shaft seal into the drain cavity shall not exceed one drop.

(13) Fuel Filter Inspection and Leak Check

a. Adjust all inputs to zero.

b. Remove and inspect fuel filter.

c. If evidence of foreign particles is found, install a new filter; otherwise, reinstall the original element.

f. Preservation

(1) Adjust input drive shaft speed to zero.

(2) Adjust inlet air and fuel inlet pressures to zero.

(3) Shut off fuel, air and electrical power supplies.

(4) Disconnect electrical connector from fuel solenoid valve.

(5) Provide a suitable drain container.

(6) Disconnect fuel lines from fuel control unit. Drain line into drain container.

(7) Disconnect air lines to fuel control unit.

(8) Perform Preservation in accordance with paragraph 11.

g. Post Test

(1) Lockwire filter cap (Figure 22, 12), plugs (16 and 20), screws (Figure 11, 3), screws (Figure 18, 50), and screws (Figure 21, 24) using lockwire (43-51).

(2) Remove fuel control unit from test setup. Drain fluids into drain container.

Do not use tape to cover openings

(3) Install drive shaft (Figure 22, 3) or flex coupling (4) and secure to unit.

(4) Plug all openings and place fuel control unit in a dust and waterproof container.

TO 2G‐GTCP85‐43‐9

WP 006 00 OO‐MAN‐2015‐00149

Results

T.O.

Paragraph Number

Required Actual Required Actual Required Actual Required Actual Required Actual Required Actual

9.e.1 1 a Close 5 ± 1 40 ± 1 PASS / FAIL a Close Close 1/2 ± 1/4 20 ± 5 0 0 b Close Close 20 ± 5 800 ± 50 0 a 10 ± 1 15 ± 1 500 ± 100 35 ± 1 25 ± 10 Record b 5 ± 1 15 ± 1 1500 ± 100 35 ± 1 65 ± 25 Record c 5 ± 1 15 ± 1 2500 ± 100 35 ± 1 165 ± 25 Record d 5 ± 1 15 ± 1 3500 ± 100 35 ± 1 275 ± 50 Record a Open/ Close

Close 15 ± 2 860 ± 10 0 60 ± 2 0 b Open/ Close

Close 1 +1/ ‐0 860 ± 10 0 60 ± 2 0 c Open/ Close

Close 5 ± 1 860 ± 10 0 60 ± 2 0 d Open/ Close

Close 10 ± 1 860 ± 10 0 60 ± 2 0 e Open/ Close

Close 20 ± 1 860 ± 10 0 60 ± 2 0 f 4 max

9.e.5 5 a Open Close 5 ± 1 25 ± 2 4260 ± 2 35 ± 1 Record 125 ± 2 PASS / FAIL a Open Close 25 ± 2 Record 35 ± 1 Record 105 ± 2 b Open Close 25 ± 2 Record 35 ± 1 Record 125 ± 2 c Open Close 25 ± 2 Record 35 ± 1 Record 205 ± 2 d Open Close 25 ± 2 Record 35 ± 1 Record 125 ± 2 e Open Close 25 ± 2 Record 35 ± 1 Record 105 ± 2 f 70‐105 g 15 max

Adjustable

(Used to adjust nozzle discharge pressure)

Close

Purging Run (Priming Operation)

Air Leakage Check, Acceleration Limiter Valve

InputsMachine Settings and DurationPart Number, Fuel Control Unit:

Applicable T.O.(s):

Inlet Air Pressure (Acceleration

Limiter Valve, Air Inlet) (psig)Time

Required (minutes)

Solenoid Position (open / close)

Nozzle/ Atomizer Bypass Valve (open / close)

Data Point

Input Driveshaft Speed

(RPM)

Nozzle Discharge Pressure (Back Pressure)

(psig)

Pump Discharge Pressure (psig)

3603100‐2/‐9 Outputs

Test Sequence

Fuel Flow Rate (pph)

9.e.2 2

2G‐GTCP85‐43‐9

9.e.6

9.e.3 PASS / FAIL3

Fuel Inlet Pressure (psig)

PASS / FAIL9.e.4

Run‐in Schedule (Pump break‐in)

For each testing sequence circle the applicable result.

PASS / FAIL

Acceleration Limiter Valve Cracking Pressure/ Crack Pressure Sensitivity

Data points: 4.a through 4.e should all remain withing tolorance limit.

SN: Date: Operator: Table 6 ‐ Testing Operation(s) and Data Point(s)

PASS / FAIL

Governor Set Point

Speed Droop and Hysteresis

Record Speed Droop (6.a minus 6.c)

Record Hysteresis (6.b minus 6.d)

TO 2G‐GTCP85‐43‐9

WP 006 00 OO‐MAN‐2015‐00149

Results

T.O.

Paragraph Number

Required Actual Required Actual Required Actual Required Actual Required Actual Required Actual

Maximum a Open Close 25 ± 2 4070 ± 10 35 ± 1 Record (7.a.1)

Record (7.a.2)

Record

Pump discharge minus nozzle discharge pressure, P.dis ‐ P.noz (7.a.2 ‐ 7.a.1) b 40 max

9.e.8 8 a Open

Adjustable (Used to adjust nozzle discharge pressure)

25 ± 2 3905 ± 10 35 ± 1 300 ± 10 410 min PASS / FAIL

Set‐Point a Open Close 1/2 ± 1/4 25 ± 2 4260 ± 5 35 ± 1 Record 125 ± 2

Speed Decrease b Open Close 25 ± 2 3930 ± 5 35 ± 1 Record

Return to Set‐Point c Open Close 25 ± 2 Record 35 ± 1 Record 125 ± 2

Ramp Down d Open Open 25 ± 1 0 0 0 0

Shutdown e Open Open 0 0 0 0 0

Repeatability Check f Open Close 25 ± 2 Record 35 ± 1 Record 125 ± 2

Maximum difference between data points: 9.a, 9.c, and 9.f g 10 max 14 max

9.e.10 10 a Open/ Close

Close 15 ± 2 860 ± 10 0 60 ± 1 0 PASS / FAIL

9.e.11 11 a Open Close 25 ± 2 4260 ± 2 35 ± 1 Record 125 ± 2 PASS / FAIL

9.e.12 12 a Close Close 5 +1/ ‐0 2 ± 1 4260 ± 5 35 ± 1 PASS / FAIL

Acceleration Limiter Valve Cracking Pressure ‐ Recheck

Final Governor Set Point

Input Shaft Seal Leakage Check

9.e.7 Fuel Flow 7 PASS / FAIL

Pump Performance

9.e.9

Repeatability and N ozzle Pressure Fluctuation

9 PASS / FAIL

Input Driveshaft Speed

(RPM)

Inlet Air Pressure (Acceleration Limiter Valve, Air Inlet)

(psig)

Nozzle Discharge Pressure (Back Pressure)

(psig)

Pump Discharge Pressure (psig)

Fuel Flow Rate (pph)

For each testing sequence circle the applicable result.

Applicable T.O.(s): 2G‐GTCP85‐43‐9 Solenoid Position (open / close)

Nozzle/ Atomizer Bypass Valve (open / close)

Time Required (minutes)

Fuel Inlet Pressure (psig)

Test Sequence Data Point

Table 6 (continued) ‐ Testing Operation(s) and Data Point(s) SN: Date: Operator:

Part Number, Fuel Control Unit: 3603100‐2/‐9 Machine Settings and Duration Inputs Outputs