Installation of the Fuel/Return Bypass Valve Hose [CFMB]

TASK 73-11-48-400-041-A
Installation of the Fuel/Return Bypass Valve Hose

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	ACCESS PLATFORM 1M(3 FT)
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 1050 and 1000 lbf.in (11.87 and 11.30 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2442)	engine oil
(Material No.CP8001)	lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)	lockwire 0.032 in. (0.8 mm) dia

C. Work Zones and Access Panels

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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
35	GASKET	AIPC 73-11-48-01-030

E. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 73-11-50-360-002-A	Leak Check and Functional Test of the Fuel Return Valve
Fuel Return Valve Hose

3. Job Set-up
Subtask 73-11-48-860-050-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).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 73-11-48-010-051-A ** ON A/C NOT FOR ALL

B. 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 73-11-48-640-050-A ** ON A/C NOT FOR ALL

A. Lubricate the coupling nut threads with engine oil (Material No.CP2442) .

Subtask 73-11-48-420-050-A ** ON A/C NOT FOR ALL

B. Installation of the Fuel/Return Bypass Valve Hose
(1) Remove the protective covers from the fuel/return bypass valve hose (5), the fuel/return bypass valve and the fluid disconnect panel.
(2) Attach the hose (5) and the AIPC 73-11-48-01-030 GASKET (35) to the fluid disconnect panel with the bolts (25) and the washers (30).
(3) TORQUE the bolts (25) to between 36 and 24 lbf.in (0.41 and 0.27 m.daN )

.
(4) Safety the bolts (25) with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.
(5) Attach the hose (5) to the bracket with the clamp (15), the bolt (10) and the nut (20).
(6) TORQUE the nut (20) to between 36 and 24 lbf.in (0.41 and 0.27 m.daN )

.
(7) Connect the hose (5) to the fuel/return bypass valve. TORQUE the coupling nut to between 1050 and 1000 lbf.in (11.87 and 11.30 m.daN )

Subtask 73-11-48-869-050-A ** ON A/C NOT FOR ALL

C. Make sure that the work area is clean and clear of tools and other items.

Subtask 73-11-48-942-050-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).

Subtask 73-11-48-720-050-A ** ON A/C NOT FOR ALL

E. Do a leak check of the fuel return valve (Ref. AMM TASK 73-11-50-360-002).

5. Close-up
Subtask 73-11-48-410-050-A ** ON A/C NOT FOR ALL

A. Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

[Rev.10 from 2021] 2026.04.01 02:58:03 UTC