Removal of the Last Chance Oil Strainer [PW11]

TASK 79-21-18-000-801-A
Removal of the Last Chance Oil Strainer

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.

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

ZONE: 400

1. Reason for the Job
Use this procedure to remove the last chance oil strainers.
For more information about the strainers, refer to (79-00-00-00U)
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	CONTAINER 20L (5 USGAL)
No specific	2	COVER - PROTECTION

B. 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, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 72-21-08-000-801-A	Removal of the Fan Exit Liner Segments
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 79-21-01-000-801-A	Removal of the Lubrication and Scavenge Oil Pump
No. 1 and 1.5 Compartment Strainer and Tee Assembly
No. 3 Compartment Bevel Gear Strainer and Tube (LP32)
Gearbox Strainer
No. 4 Compartment Strainer and Tube (LP41)
No. 5 and 6 Compartment Strainer and Tube (LP46)
Compartment Gearbox Bevel Gear Strainer and Tube (LP30)

3. Job Set-up
Subtask 79-21-18-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 79-21-18-010-050-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 79-21-18-040-050-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for 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 maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 79-21-18-010-051-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

4. Procedure

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

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.

Subtask 79-21-18-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Last Chance Oil Strainers
(1) Removal of the protection cover.

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) Remove the fan exit liner segments at the 7:30 and 11 o'clock positions (Ref. AMM TASK 72-21-08-000-801).
(3) Find the last chance oil strainers (4), (15), (28), (47), (63) and (75) as follows:
(a) Find the No. 1 and 1.5 bearing compartment strainer (4) forward of the Compressor Intermediate Case (CIC) firewall at the 9 o'clock position

No. 1 and 1.5 Compartment Strainer and Tee Assembly ** ON A/C NOT FOR ALL

(b) Find the No. 3 bearing compartment bevel gear strainer (15) on the CIC at the 7:30 o'clock position

No. 3 Compartment Bevel Gear Strainer and Tube (LP32) ** ON A/C NOT FOR ALL

Gearbox Strainer ** ON A/C NOT FOR ALL

(d) Find the No. 4 bearing compartment strainer (47) on the High Pressure Turbine (HPT) case at the 4 o'clock position

No. 4 Compartment Strainer and Tube (LP41) ** ON A/C NOT FOR ALL

(e) Find the No. 5 and 6 bearing compartment strainer (63) above the N1 flange at the 11 o'clock position

No. 5 and 6 Compartment Strainer and Tube (LP46) ** ON A/C NOT FOR ALL

(f) Find the No. 3 bearing compartment gearbox bevel gear strainer (75) on the CIC at the 9 o'clock position

Compartment Gearbox Bevel Gear Strainer and Tube (LP30) ** ON A/C NOT FOR ALL

Subtask 79-21-18-020-051-A ** ON A/C NOT FOR ALL

B. Remove the No. 1 and 1.5 bearing compartment strainer (4) and the tee assembly (LP60) (3) as follow:

No. 1 and 1.5 Compartment Strainer and Tee Assembly ** ON A/C NOT FOR ALL

(1) Put a CONTAINER 20L (5 USGAL) below the tee assembly (LP60) (3).
(2) Disconnect the tee assembly (LP60) (3) B-nut from the tube (LP63).
(3) Remove the six bolts (5), the tee assembly (LP60) (3), seal (1) and strainer (4) from the oil manifold and tube (LP61).
(4) Remove the strainer (4) from the tee assembly (LP60) (3).
(5) Remove and discard the packing (2) from the tube (LP63).

Subtask 79-21-18-020-052-A ** ON A/C NOT FOR ALL

C. Remove the No. 3 bearing compartment bevel gear strainer (15) and tube (LP32) (16) as follows:

No. 3 Compartment Bevel Gear Strainer and Tube (LP32) ** ON A/C NOT FOR ALL

(1) Put a CONTAINER 20L (5 USGAL) below the tube (LP32) (16).
(2) Disconnect the tube (LP32) (16) B-nut from the oil manifold.
(3) Disconnect the tube (LP112) B-nut and remove the tube (LP32) (16).
(4) Remove the strainer (15) from the tube (LP112).
(5) Remove the metering plug (17) from the tube (LP32) (16).

Subtask 79-21-18-020-053-A ** ON A/C NOT FOR ALL

D. Remove the gearbox strainer (28) as follows:

Gearbox Strainer ** ON A/C NOT FOR ALL

(1) Put a CONTAINER 20L (5 USGAL) below the OCM.
(2) Remove the two bolts (30) and plate (27) from the OCM.
(3) Remove and discard the packing (29) from the plate (27).
(4) Remove the strainer (28) from the OCM.

Subtask 79-21-18-020-054-A ** ON A/C NOT FOR ALL

E. Remove the No. 4 bearing compartment strainer (47) and tube (LP41) (46) as follows:

No. 4 Compartment Strainer and Tube (LP41) ** ON A/C NOT FOR ALL

(1) Put a CONTAINER 20L (5 USGAL) below tube (LP41) (46) .
(2) Remove the three bolts (44), two clamps (45), clamp (41) and heat shield (40) from the tube (LP41) (46).
(3) Disconnect the tube (LP41) (46) B-nut from the tube (LP45).
(4) Remove the metering plug (49) from the tube (LP41) (46).
(5) Disconnect the tube (LP121) B-nut and remove the tube (LP41) (46).
(6) Remove the gasket (48) from the tube (LP41) (46).
(7) Remove the strainer (47) from the tube (LP121).
(8) Remove the two bolts (43) and bracket (42) from the bracket.

Subtask 79-21-18-020-055-A ** ON A/C NOT FOR ALL

F. Remove the No. 5 and 6 bearing compartment strainer (63) and tube (LP46) (59) as follows:

No. 5 and 6 Compartment Strainer and Tube (LP46) ** ON A/C NOT FOR ALL

(1) Put a CONTAINER 20L (5 USGAL) under the tube (LP46) (59).
(2) Remove the two hose clamps (60), heat shields (61) and heat shields (62) from the tube (LP46) (59).
(3) Disconnect the tube (LP46) (59) B-nut from tube (LP45).
(4) Disconnect the tube (LP131) B-nut from the tube (LP46) (59).
(5) Remove the five bolts (58), the five clamps (57) and tube (LP46) (59) from the brackets.
(6) Remove the strainer (63) from the tube (LP46) (59).

Subtask 79-21-18-020-056-A ** ON A/C NOT FOR ALL

G. Remove the No. 3 bearing compartment gearbox bevel gear strainer (75) and tube (LP30) (74) as follows:

Compartment Gearbox Bevel Gear Strainer and Tube (LP30) ** ON A/C NOT FOR ALL

(1) Disconnect the tube (LP30) (74) B-nut from the oil manifold.
(2) Disconnect the tube (LP111) B-nut and remove the tube (LP30) (74).
(3) Remove the strainer (75) from the tube (LP111).
(4) Remove the metering plug (73) from the tube (LP30) (74).

POST SB C-72-00-0077A
(5) Remove the strainer from the lubrication and scavenge oil pump, if necessary (Ref. AMM TASK 79-21-01-000-801).

END OF POST SB C-72-00-0077A

(6) Installation of the protection cover.

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

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

[Rev.10 from 2021] 2026.04.01 13:14:33 UTC