Removal of the Engine Fuel/Oil Heat Exchanger Bypass Valve [PW11]

TASK 79-21-09-000-801-A
Removal of the Engine Fuel/Oil Heat Exchanger Bypass 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: DO NOT LET ENGINE FUEL STAY ON YOUR SKIN FOR A LONG TIME. FLUSH THE FUEL FROM YOUR SKIN WITH WATER. THE FUEL IS POISONOUS AND CAN GO THROUGH YOUR SKIN AND INTO YOUR BODY.

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

CAUTION: DO NOT LET ENGINE FUEL, OIL OR HYDRAULIC FLUID SPILL ON THE ENGINE. YOU MUST IMMEDIATELY REMOVE UNWANTED FUEL, OIL OR HYDRAULIC FLUID WITH A CLOTH. FUEL, OIL OR HYDRAULIC FLUID CAN CAUSE DAMAGE TO SOME ENGINE PARTS.

ZONE: 400
FIN: 4019KS ** ON A/C NOT FOR ALL

1. Reason for the Job
Use this procedure to remove the Engine Fuel/Oil Heat Exchanger Bypass Valve.
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	1	CONTAINER 20L (5 USGAL)
No specific	AR	COVER - PROTECTION
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 )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P03-001)	lubricant, aircraft turbine engine
(Material No.P05-005)	lint-free cotton cloth
(Material No.P06-053)	Sealing Ring Lubricant

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
18	PACKING	EIPC 73-11-02-01-280

E. Referenced Information

REFERENCE	DESIGNATION
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 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 79-00-00-680-801-A	Drain the Engine Oil
TASK 79-21-09-400-801-A	Installation of the Engine Fuel/Oil Heat Exchanger Bypass Valve
Engine Fuel/Oil Heat Exchanger Bypass Valve
Engine Fuel/Oil Heat Exchanger Bypass Valve

3. Job Set-up
Subtask 79-21-09-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do 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 79-21-09-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (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
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 79-21-09-040-050-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser 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) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 79-21-09-010-051-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the left thrust reverser cowl-doors (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

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

Subtask 79-21-09-680-050-A ** ON A/C NOT FOR ALL

A. Drain the engine oil (Ref. AMM TASK 79-00-00-680-801).

Subtask 79-21-09-680-051-A ** ON A/C NOT FOR ALL

B. Drain the Engine Fuel System at the Fuel Manifold

Engine Fuel/Oil Heat Exchanger Bypass Valve ** ON A/C NOT FOR ALL

WARNING: DO NOT GET FUEL IN YOUR MOUTH, EYES OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM THE FUEL. KEEP THE FUEL AWAY FROM SPARKS, FLAME AND HEAT. FUEL IS POISONOUS AND FLAMMABLE, WHICH CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.

(1) Put the CONTAINER 20L (5 USGAL) under the drain port on the fuel manifold.
(2) Loosen the drain plug retention bolt (15) on the fuel manifold.
(3) Turn the drain plug (17) to disengage the retention tab from under the retention bolt (15) and washer (16).
(4) Removal of the Drain Plug

CAUTION: DO NOT PRY ON THE RETENTION TAB TO REMOVE THE DRAIN PLUG. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE DRAIN PLUG CAN OCCUR.

(a) Hold the drain plug (17) by the square, turn and pull it as necessary to remove it from the fuel manifold.
(5) Let the fuel drain into the CONTAINER 20L (5 USGAL).
(6) Wipe the remaining fuel with a lint-free cotton cloth (Material No.P05-005) .
(7) Remove and discard the packing (18) from the drain plug (17).
(8) Apply P03-001lubricant, aircraft turbine engine or Sealing Ring Lubricant (Material No.P06-053) to a new EIPC 73-11-02-01-280 PACKING (18).
(9) Install the EIPC 73-11-02-01-280 PACKING (18) on the drain plug (17).
(10) Installation of the drain plug

CAUTION: DO NOT PUSH ON THE RETENTION TAB TO INSTALL THE DRAIN PLUG. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE DRAIN PLUG CAN OCCUR.

(a) Hold the drain plug (17) at the square and press and turn the drain plug until it fully seats against the fuel manifold.
(11) Make sure the drain plug (17) is fully seated against the mating surface.
(12) Turn the drain plug (17) so the retention tab is under the retention bolt (15) and washer (16).
(13) TORQUE the drain plug retention bolt (15) to between 70 and 60 lbf.in (0.79 and 0.68 m.daN )

Subtask 79-21-09-020-050-A ** ON A/C NOT FOR ALL

C. Removal of the Engine Fuel/Oil Heat Exchanger Bypass Valve

Engine Fuel/Oil Heat Exchanger Bypass Valve ** ON A/C NOT FOR ALL

(1) Find the bypass valve (1) at approximately the 10 o'clock position on the fuel/oil manifold.
(2) Remove the bypass valve (1) as follows:
(a) Disconnect the (WC10) wiring harness (4011KS) connector (P52) from the bypass valve (1) with the PLIERS - JAWED, SOFT.
(b) Put a lint-free cotton cloth (Material No.P05-005) under the bypass valve (1) to absorb any remaining oil.
(c) Remove the six bolts (3) and washers (4).
(d) Remove the bypass valve (1).
(e) Remove the face seal (2).

NOTE: The face seal (2) can be reused later (Ref. AMM TASK 79-21-09-400-801).

(3) Installation of the protection covers

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install COVER - PROTECTION as necessary to prevent damage to the engine.

[Rev.10 from 2021] 2026.04.01 03:41:41 UTC