Installation of the Fuel Return Valve [CFMI]

TASK 73-11-50-400-001-A
Installation 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 110 and 100 lbf.in (1.24 and 1.13 m.daN )
No specific	Torque wrench: range to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )
No specific	Torque wrench: range to between 550 and 450 lbf.in (6.22 and 5.09 m.daN )
No specific	Torque wrench: range to between 1050 and 1000 lbf.in (11.87 and 11.30 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP2442)	engine oil

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
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.
Removal/Installation of the Fuel Return Valve

3. Job Set-up
Subtask 73-11-50-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).

Subtask 73-11-50-865-055-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VU	FUEL/LP VALVE/MOT1/ENG1	1QG	A08
121VU	FUEL/LP VALVE/MOT2/ENG1	3QG	M25
FOR FIN: 1000EM2 (ENGINE2)
49VU	FUEL/LP VALVE/MOT1/ENG2	2QG	A09
121VU	FUEL/LP VALVE/MOT2/ENG2	4QG	M26

Subtask 73-11-50-010-055-A ** ON A/C NOT FOR ALL

C. Make sure that the fan cowl doors are open: (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 73-11-50-420-050-A ** ON A/C NOT FOR ALL

A. Remove blanking caps and blanking plugs from the disconnected connectors and tubes.

CAUTION: TAKE CARE DURING FUEL RETURN VALVE INSTALLATION NOT TO DAMAGE THE NIPPLES.

(1) Install the fuel return valve as follows:

Removal/Installation of the Fuel Return Valve ** ON A/C NOT FOR ALL

(a) Apply a thin layer of graphite grease (Material No.CP2101) to the threads of the bolts (30).
(b) Install and attach the fuel return valve (90) with the bolts (30).
(c) TORQUE the bolts (30) to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )

Subtask 73-11-50-420-053-A ** ON A/C NOT FOR ALL

B. Connect the fuel tubes as follows:
(1) Lubricate the nipples with engine oil (Material No.CP2442) and connect the fuel tubes. Do not torque the
(a) Shutoff signal tube (80)
(b) Fuel Pump HP tube (50)
(c) Fuel Pump LP tube (20)
(d) IDG tube (40)
(e) Fuel return tube (10)
(2) TORQUE the coupling nuts of the tubes as follows:

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

(a) Shutoff signal tube (80) (from the hydromechanical unit-HMU) to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )

.
(b) Fuel pump HP tube (50) (from the servo fuel heater circuit) to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )

.
(c) Fuel pump LP tube (20) to between 550 and 450 lbf.in (6.22 and 5.09 m.daN )

.
(d) Integrated drive generator tube (IDG) (40) to between 550 and 450 lbf.in (6.22 and 5.09 m.daN )

.
(e) Fuel return tube (10) to between 1050 and 1000 lbf.in (11.87 and 11.30 m.daN )

.
(3) Connect the electrical connectors J7 (70) and J8 (60). Tighten connector by hand plus one eight turn using PLIERS - NOSE, SOFT, LONG.

Subtask 73-11-50-360-052-A ** ON A/C NOT FOR ALL

C. Do a leak check (Ref. AMM TASK 73-11-50-360-001).

5. Close-up
Subtask 73-11-50-410-051-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).

Subtask 73-11-50-865-052-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VU	FUEL/LP VALVE/MOT1/ENG1	1QG	A08
121VU	FUEL/LP VALVE/MOT2/ENG1	3QG	M25
FOR FIN: 1000EM2 (ENGINE2)
49VU	FUEL/LP VALVE/MOT1/ENG2	2QG	A09
121VU	FUEL/LP VALVE/MOT2/ENG2	4QG	M26

Subtask 73-11-50-862-050-A ** ON A/C NOT FOR ALL

C. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 02:55:45 UTC