Removal of the Fuel Return Valve (FRV) [CFMB]

TASK 73-11-50-000-002-A
Removal of the Fuel Return Valve (FRV)

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	CAP - BLANKING
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	PLIERS - CONNECTOR, JAW, SOFT
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

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 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
Fuel Return Valve PRE SB CFM 73-0096
Fuel Return Valve POST SB CFM 73-0096

3. Job Set-up
Subtask 73-11-50-941-056-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 73-11-50-861-051-A ** ON A/C NOT FOR ALL

B. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 73-11-50-865-053-A ** ON A/C NOT FOR ALL

C. Open, safety and tag 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 73-11-50-010-057-A ** ON A/C NOT FOR ALL

D. Open the fan cowl doors: (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 73-11-50-020-053-A ** ON A/C NOT FOR ALL

A. Removal of the Fuel Return Valve

CAUTION: INSTALL CAPS AND PLUGS ON THE ORIFICES OF ALL DISCONNECTED PIPES AND PARTS FOR THEIR PROTECTION AGAINST CONTAMINATION BY UNWANTED MATERIALS.

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.

(1) Install a CONTAINER 5 L (1.32 USGAL) under the fuel return valve and loosen the fuel return tube (10) coupling nut to drain the fuel which remains in the tube.

PRE SB CFM 73-0096

(2) Disconnect the fuel tubes which follow:
(a) Fuel return tube (10).
(b) Shutoff signal (PB/PSF) fuel tube (30).
(c) Fuel pump HP tube (40).
(d) IDG cooler tube (50).
(e) Fuel pump LP tube (60).
(f) Drain tube (90)

END OF PRE SB CFM 73-0096

POST SB CFM 73-0096

(3) Disconnect the fuel tubes which follow:
(a) Fuel return tube (10).
(b) Bypass (PB/PSF) fuel tube (30).
(c) Fuel pump HP tube (40).
(d) IDG cooler tube (50).
(e) Fuel pump LP tube (60).
(f) Drain tube (90)

END OF SB CFM 73-0096

(4) Disconnect the HJ7 harness connector (70) and the HJ8 harness connector (80). Use PLIERS - CONNECTOR, JAW, SOFT only if necessary.
(5) Remove the FRV

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

(a) Remove the 4 bolts (100) and washers (110) which attach the FRV on bracket (20), between flanges E and F at the 10 o'clock position.
(b) Remove the FRV from the engine.
(c) Install CAP - BLANKING on the disconnected parts and orifices.

[Rev.10 from 2021] 2026.04.01 02:58:07 UTC