Installation of the Fuel Return Hose from the Fuel Return Valve (FRV) to the Pylon [CFML]

TASK 73-11-49-400-804-A
Installation of the Fuel Return Hose from the Fuel Return Valve (FRV) to the Pylon

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: BE CAREFUL NOT TO GET AIRCRAFT FUEL IN YOUR MOUTH OR IN YOUR EYES. IF YOU GET FUEL ON YOUR SKIN OR ON YOUR CLOTHES, FLUSH IT IMMEDIATELY WITH WATER. IF NECESSARY, GET MEDICAL HELP. AIRCRAFT FUEL IS POISONOUS.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 210
ZONE: 400

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	CAP - PROTECTION
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - STANDARD
No specific	Torque wrench: range to between 0.37 and 0.31 m.daN (32.74 and 27.43 lbf.in )
No specific	Torque wrench: range to between 6.00 and 5.20 m.daN (44.25 and 38.35 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CPNCL00062)	Synthetic base lubricating oil - turbine engine

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	GASKET	AIPC 73-11-49-03-020

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 70-24-00-910-814-A	Standard Torque Recommendations
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 73-29-00-740-802-A	Actuators Test (Menu Mode)
Fuel Return Hose from the Fuel Return Valve (FRV) to the Pylon

3. Job Set-up
Subtask 73-11-49-941-067-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 73-11-49-010-068-A

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

4. Procedure
Subtask 73-11-49-420-057-A

A. Installation of the Fuel Return Hose from the FRV to the Pylon
(1) Remove the CAP - PROTECTION from all open ports, tubes and hoses.
(2) Install the fuel return hose (4) as follows:
(a) Lubricate the threads of the bolts (6) with Synthetic base lubricating oil - turbine engine (Material No.CPNCL00062) .
(b) Put a new AIPC 73-11-49-03-020 GASKET (3) in position on the upper flange of the fuel return hose (4).
(c) Attach the upper flange of the fuel return hose (4) to the flange of the pylon interface (2) with the bolts (6) and the spacers (5).
(d) Tighten the bolts (6) with your hand.
(e) Connect the lower end of the fuel return hose (4) to the fitting on the FRV (7).
(f) TRIPLE TORQUE the bolts (6) to between 0.37 and 0.31 m.daN (32.74 and 27.43 lbf.in )

(Ref. AMM TASK 70-24-00-910-814).
(g) Put a mark on the connection after tightening (Ref. AMM TASK 20-23-22-910-001).
(h) TORQUE the tube nut on the fuel return hose (4) at the fitting on the FRV (7) as follows:

CAUTION: USE THE COUNTER WRENCH TO LOOSEN THE TUBE COUPLING NUTS. OTHER WRENCHES CAN CAUSE DAMAGE TO THE HARDWARE.

1 Use a counter WRENCH - STANDARD to hold the fitting on the FRV (7).
2 TRIPLE TORQUE the tube nut on the fuel return hose (4) to between 6.00 and 5.20 m.daN (44.25 and 38.35 lbf.ft )

(Ref. AMM TASK 70-24-00-910-814).

5. Close-up
Subtask 73-11-49-710-056-A

A. Test(s)
(1) Do the actuators test (menu mode) (Ref. AMM TASK 73-29-00-740-802).

Subtask 73-11-49-410-061-A

B. 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 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:04:17 UTC