Installation of the Fuel Return To Tank (RTT) Valve [PW11]

TASK 73-13-03-400-801-A
Installation of the Fuel Return To Tank (RTT) Valve

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

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

ZONE: 400
FIN: 4082KS ** ON A/C NOT FOR ALL

1. Reason for the Job
Use this procedure to install the fuel Return To Tank (RTT) valve.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	PLIERS - JAWED, SOFT
No specific	Torque wrench: range to between 70 and 60 lbf.in (0.79 and 0.68 m.daN )
No specific	Torque wrench: range to between 470 and 430 lbf.in (5.31 and 4.86 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P03-002)	Flushing Oil
(Material No.P06-054)	Antigalling Compound

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	FACE SEAL	EIPC 73-13-03-01-090

E. Referenced Information

REFERENCE	DESIGNATION
TASK 26-12-62-400-802-A	Installation of the Loop-B Fire Harness
TASK 71-00-00-720-814-A	Test No. 2A - Engine Motor Leak Test (Wet Method)
TASK 71-00-00-860-832-A	Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 73-25-34-400-802-A	Installation of the Engine Interface Unit (EIU)
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Fuel RTT Valve

3. Job Set-up
Subtask 73-13-03-941-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832).

Subtask 73-13-03-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.

Subtask 73-13-03-040-051-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser System for Ground Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Make sure that you did the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 73-13-03-010-053-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Make sure that the left-thrust reverser cowl-door is open (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL.

4. Procedure
Subtask 73-13-03-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Fuel Return To Tank (RTT) Valve

Fuel RTT Valve ** ON A/C NOT FOR ALL

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

(1) Removal of the protection covers:

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

(a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine.
(2) Install the fuel RTT valve (1) on the thermal management system manifold as follows:
(a) Apply Antigalling Compound (Material No.P06-054) to the threads of the four bolts (4).

NOTE: For new or refurbished bolts or nuts with baked-on lubricant, do not do the wet application.

(b) Inspect the current face seal (2) for reusability as follows:
1 Raised material on the metal surface is not permitted.
2 Rubber that is not bonded to the seal plate is not permitted.
3 Rubber that is missing is not permitted.
4 Inspect the rubber seal for separation from the seal plate.
5 Rubber that is cut or damaged is not permitted.
6 Make sure that the rubber material is above the metal surface.
(c) Install the EIPC 73-13-03-01-090 FACE SEAL (2) and valve (1) with the four bolts (4) and four washers (3).
(d) TORQUE the four bolts (4) to between 70 and 60 lbf.in (0.79 and 0.68 m.daN )

equally in an opposite pattern until the same torque indication holds.
(3) Apply Flushing Oil (Material No.P03-002) or equivalent onto the fuel tube B-nut and valve (1) adapter threads.
(4) Connect the fuel tube to the valve (1).

CAUTION: USE A SECOND WRENCH TO HOLD THE MATING PARTS WHEN YOU LOOSEN OR TIGHTEN THE TUBE OR HOSE NUTS. IF YOU DO NOT OBEY THIS CAUTION, YOU CAN TWIST OR CAUSE DAMAGE TO THE TUBES OR HOSES.

(5) TORQUE the B-nut to between 470 and 430 lbf.in (5.31 and 4.86 m.daN )

NOTE: Do not loosen the B-nut.

(6) TORQUE the B-nut again to between 470 and 430 lbf.in (5.31 and 4.86 m.daN )

.
(7) Connect the wiring harness (WC11) connector (P68) to the fuel RTT valve receptacle (J68) as follows:
(a) Examine, align and engage the connector.
(b) Push lightly inward on the connector while you tighten the coupling ring.
(c) Use the PLIERS - JAWED, SOFT and tighten the connector against the receptacle.
(d) Make sure that you can feel the ratchet feature.
(e) While you tighten, push the connector in and from side to side.
(f) Tighten the connector until the PLIERS - JAWED, SOFT slip on the connector ring.
(8) Install the loop-B fire harness on its supports if clamps were removed (Ref. AMM TASK 26-12-62-400-802).
(9) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 73-13-03-410-050-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 left-thrust reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL.
(3) Remove the CONTAINER 20L (5 USGAL).

Subtask 73-13-03-440-050-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 73-13-03-410-051-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
(2) Remove the WARNING NOTICE(S).
(3) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802).

Subtask 73-13-03-710-050-A ** ON A/C NOT FOR ALL

D. Operational Test
(1) Do test No. 2A - engine motor leak test (wet method) (Ref. AMM TASK 71-00-00-720-814).

[Rev.10 from 2021] 2026.04.01 03:02:25 UTC