Functional Test of the Fuel Return Valve [CFMI]

TASK 73-11-50-720-001-A
Functional Test of the Fuel Return Valve

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	PLIERS - NOSE, SOFT, LONG
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 36 and 24 lbf.in (0.41 and 0.27 m.daN )
No specific	Torque wrench: range to between 472.5 and 427.5 lbf.in (5.34 and 4.83 m.daN )
856A2776	1	TOOL SET-CHECKING FRV
856A2797	1	ADAPTER-FUEL RETURN VALVE
TT1000A	1	DIGITAL TURBINE TEMPERATURE TEST SET

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-710-006-A	Minimum Idle Check
TASK 71-00-00-710-028-A	Engine Shutdown
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 73-11-50-360-001-A-01	Leak check of the Fuel Return Valve.
Installation of the Checking Tool Set, 856A2776
Electrical Disconnection/Connection of Oil Temperature Sensor
Front Panel of the Barfield Tester
Set-Up of the Barfield Tester

3. Job Set-up
Subtask 73-11-50-941-054-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 73-11-50-865-050-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41
FOR FIN: 1000EM2 (ENGINE2)
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
121VU	ENGINE/ENG2/FADEC B	4KS2	Q40

Subtask 73-11-50-010-052-A ** ON A/C NOT FOR ALL

C. Open the fan cowls (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure
Subtask 73-11-50-020-051-A ** ON A/C NOT FOR ALL

A. Disconnect the Fuel Tube.
(1) Remove the three clamps that attach the fuel return tube (10) to the three fan frame brackets.
(2) Disconnect the fuel return tube (10) from the Fuel Return Valve (FRV).

Subtask 73-11-50-480-051-A ** ON A/C NOT FOR ALL

B. Preparation for the Test.

Installation of the Checking Tool Set, 856A2776 ** ON A/C NOT FOR ALL

(1) Connect the 856A2776 TOOL SET-CHECKING FRV (856A2776G01), between the fuel return tube (10) and the fuel return valve (120). TORQUE to between 472.5 and 427.5 lbf.in (5.34 and 4.83 m.daN )

.
(2) Disconnect the J13 harness electrical connector from the oil temperature sensor (100).

Electrical Disconnection/Connection of Oil Temperature Sensor ** ON A/C NOT FOR ALL

(3) Connect the oil temperature adapter lead:

CAUTION: MAKE SURE THAT THE INPUT VOLTAGE IS CORRECT OTHERWISE, DAMAGE TO THE ECU COULD OCCUR.

(a) Connect the 856A2797 ADAPTER-FUEL RETURN VALVE (856A2797G01) to the J13 harness connector (110).
(4) Set-up the TT1000A DIGITAL TURBINE TEMPERATURE TEST SET or equivalent as follows:

Front Panel of the Barfield Tester ** ON A/C NOT FOR ALL

Set-Up of the Barfield Tester ** ON A/C NOT FOR ALL

(a) Energize the tester.
(b) Set the FUNCTION switch to RESISTANCE MEASURE.
(c) Set the RESISTANCE RANGE switch to 20 ohms.
(d) Connect the test clips together.
(e) Push the red PUSH TO SET button, and adjust the SYSTEM RES potentiometer to one ohm on the Liquid Cristal Display (LCD).
(f) Set the FUNCTION switch to INDICATOR TEST.
(g) Set the TEMP ADJ potentiometer to the minimum value.
(h) Connect the black clip:

CAUTION: MAKE SURE OF THE CORRECT POLARITY TO PREVENT DAMAGE TO THE TEST SET.

1 Connect the black clip of the tester to the black wire of the 856A2797 ADAPTER-FUEL RETURN VALVE (856A2797G01) ((-) alumel indicator) and the red clip to the red wire of the adapter ((+) chromel indicator).

Subtask 73-11-50-720-050-A ** ON A/C NOT FOR ALL

C. Functional Test of the Fuel Return Valve.
(1) Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006).
(a) While the engine operates, set the "TEMP ADJ" potentiometer of the BARFIELD tester to 100 deg.C (212 deg.F) to 110 deg.C (230 deg.F) on the LCD and make sure that the pressure gage on 856A2776 TOOL SET-CHECKING FRV (856A2776G01), shows a positive reading.

NOTE: The ECU energizes the FRV solenoid valve when the oil temperature is 93 deg.C (199.4 deg.F), the FRV operates at 100 deg.C (212.00 deg.F).

NOTE: If the reading is not positive, the FRV does not operate.

(2) Shut down the engine (Ref. AMM TASK 71-00-00-710-028)
(3) De-energize the Barfield tester.

Subtask 73-11-50-420-051-A ** ON A/C NOT FOR ALL

D. Remove the Checking Tool Set of the Fuel Return Valve:

Installation of the Checking Tool Set, 856A2776 ** ON A/C NOT FOR ALL

(1) Remove the 856A2776 TOOL SET-CHECKING FRV (856A2776G01), from the FRV (120).
(2) Connect the fuel return tube (10). TORQUE coupling nut to between 472.5 and 427.5 lbf.in (5.34 and 4.83 m.daN )

.
(3) Install the three clamps that attach the hose on the 3 fan frame brackets. TORQUE the screws to between 36 and 24 lbf.in (0.41 and 0.27 m.daN )

Subtask 73-11-50-360-051-A ** ON A/C NOT FOR ALL

E. Energize the tester then do a leak check (Ref. AMM TASK 73-11-50-360-001).

Subtask 73-11-50-080-051-A ** ON A/C NOT FOR ALL

F. 5 minutes after the engine shutdown de-energize the ECU. Then de-energize the tester and disconnect the adapter lead (856A2797G01) from the BARFIELD tester and from the oil temperature sensor.

Subtask 73-11-50-420-052-A ** ON A/C NOT FOR ALL

G. Connect the electrical connector (110) to the oil temperature sensor (100). Tighten the connector fingertight plus one eight turn. Do this use PLIERS - NOSE, SOFT, LONG .

5. Close-up
Subtask 73-11-50-410-052-A ** ON A/C NOT FOR ALL

A. Close access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:55:47 UTC