Visual Inspection of the Engine Oil System [PW11]

TASK 79-00-00-210-810-A
Visual Inspection of the Engine Oil System

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.

ZONE: 400

1. Reason for the Job
Use this procedure to do an inspection of the oil system external parts for damage (nicks, dents, corrosion, pitting and scratches), correct attachment, correct clearance and leakage.
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	CLOTH-CROCUS

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 71-00-00-710-806-A	Power Assurance Test
TASK 71-00-00-720-811-A	Test No. 3A - Idle Power Test
TASK 71-00-00-860-814-A	Shutdown of the Engine
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 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 72-61-01-100-801-A	Cleaning of the Main Gearbox with a Chemical Agent
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
TASK 79-00-00-210-808-A	Visual Inspection of the Oil Consumption Monitoring
TASK 79-00-00-281-802-A	Inspection of the Magnetic Chip Collectors for Oil Contamination
TASK 79-11-01-000-801-A	Removal of the Oil Tank
TASK 79-11-01-400-801-A	Installation of the Oil Tank
Engine Oil System - Left Side of Engine
Engine Oil System - Right Side of Engine
Engine Oil System - Oil Tank and Cap

3. Job Set-up
Subtask 79-00-00-941-089-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 79-00-00-010-096-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 79-00-00-040-062-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 79-00-00-010-097-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.

Subtask 79-00-00-210-097-A ** ON A/C NOT FOR ALL

A. Do a visual inspection of the oil system tubes and oil tank for damage as follows:

Table 601: Damage Limits for the Oil System Tubes

EXAMINE	DAMAGE	DISPOSITION
For cracks	All quantities, all locations	Not permitted. Replace the tube.
For corrosion and stains	All quantities, all locations	Permitted only if corrosion or stains can be removed by light polishing with a CLOTH-CROCUS.
For heavy corrosion that cannot be removed by light polishing		Not permitted. Replace the tube.
For nicks, scratches, chafe and pits	All quantities, all locations with a depth not more than 0.003 in. (0.076 mm)	The oil system tube is permitted to continue in service.
	All quantities, all locations with a depth more than 0.003 in. (0.076 mm)	Not permitted. Replace the tube.
For dents	Dents without sharp edges or corners	Permitted if the tube Outer Diameter (OD) is not decreased by more than 20 percent at each location.
	Dents more than 0.050 in. (1.27 mm) in depth and less than 3 in. (76.20 mm) to the edge of a different dent	Not permitted. Replace the tube.
	All dents that have sharp corners or edges	Not permitted. Replace the tube.
	Dents in a location of 0.250 in. (6.35 mm) or less from the ferrule	Not permitted. Replace the tube.

Table 602: Damage Limits for the Oil Tank and Heat Shield

EXAMINE	DAMAGE	DISPOSITION
For cracks or surface damage on the filler cap or visible portions of the oil tank	All quantities	Not permitted. Replace the oil tank (Ref. AMM TASK 79-11-01-000-801) and (Ref. AMM TASK 79-11-01-400-801).
For a cracked sight glass	All quantities	Not permitted. Replace the oil tank (Ref. AMM TASK 79-11-01-000-801) and (Ref. AMM TASK 79-11-01-400-801).
For oil leaks	All quantities	Not permitted. Replace the oil tank (Ref. AMM TASK 79-11-01-000-801) and (Ref. AMM TASK 79-11-01-400-801).
For heat shield surface damage or punctures	All size or quantities of damage that does not puncture or breakthrough the heat shield outer shell into the insulation material and does not affect the fit and function of the heat shield	Permitted.
	Damage that does puncture or breakthrough the heat shield outer shell into the insulation or does affect the fit and function of the heat shield	Not permitted. Replace the oil tank (Ref. AMM TASK 79-11-01-000-801) and (Ref. AMM TASK 79-11-01-400-801).
For oil stains or heat discoloration on the heat shield	All quantities of heat discoloration or stains from normal engine service	Permitted.
For burning or breakthrough to the heat shield insulation material	All quantities	Not permitted. Replace the oil tank (Ref. AMM TASK 79-11-01-000-801) and (Ref. AMM TASK 79-11-01-400-801).
For loose or missing heat shield blanket retaining straps	All quantities of loose or missing retaining straps	Not permitted. Replace the oil tank (Ref. AMM TASK 79-11-01-000-801) and (Ref. AMM TASK 79-11-01-400-801).
Oil tank cap
For paint chipping or peeling on the oil tank cap	All sizes and quantities of paint chipping or peeling	Permitted.

(1) Do a visual inspection of the oil tubes to make sure that there is 0.090 in. (2.286 mm) minimum clearance with adjacent tubes or parts. If the clearance is less than 0.090 in. (2.286 mm), do the steps that follow:

Engine Oil System - Left Side of Engine ** ON A/C NOT FOR ALL

Engine Oil System - Right Side of Engine ** ON A/C NOT FOR ALL

CAUTION: YOU MUST ADJUST ALL TUBES TO ENSURE CLEARANCE TO ADJACENT TUBES OR PARTS. TUBES WITH NO CLEARANCE CAN CHAFE DURING ENGINE OPERATION. THIS CAN CAUSE A LEAK AND A POSSIBLE IN-FLIGHT SHUTDOWN.

(a) Loosen all the clamp bolts and brackets at the support points along the tube length.
(b) Loosen all the tube fittings.
(c) Adjust the tube and clamps to obtain clearance to adjacent tubes or parts.
(d) Tighten all the clamp bolts and brackets.
(e) Tighten all the tube fittings.
(f) Check the tubes that were adjusted for leaks.
(2) Do a visual inspection of the oil system tubes for correct installation as follows:
(a) Examine the tube connections for loose connections.
(b) Tighten all loose connections as necessary.
(c) Examine the tubes for correct attachment at all support locations.
(d) Replace all worn or damaged clamps.
(e) Tighten all loose clamp bolts, flange bolts and tube connections for the full length of the tube.
(3) Do a visual inspection of the oil system tubes and components for leakage and wetting as follows:

NOTE: Oil wetting and oil leakage are two different conditions. Oil leakage is defined as the collection of oil into the formation of a drop or the expectancy of a drop that will detach itself during an engine operating test. Oil wetting is characterized as a moist surface around a joining face or connection, without fluid dripping.

(a) Do a visual inspection of the oil system tube connections, tube-to-component connections, tube-to-case boss connections and the oil system components for leakage.
(b) No leakage is permitted.

NOTE: Oil wetting is permitted. Oil wetting is characterized as a moist surface around a joining face or connection, without fluid dripping.

(c) Repair all leaks as necessary.
(d) After all repairs, check the oil tube connections again for leaks.
(4) Make sure that all oil system components are correctly attached.
(a) Correct as necessary.
(5) Do a visual inspection of the gearbox for leakage as follows:
(a) Examine all the gearbox plugs for oil leakage.
(b) Examine all the components installed on the gearbox and component interfaces for oil leakage.
(c) The only oil leakage permitted is as follows:
1 Clean the remaining oil from the breather tube and Integrated Drive Generator (IDG)/deoiler cover interface.

Engine Oil System - Right Side of Engine ** ON A/C NOT FOR ALL

2 Oil leakage at the breather tube and IDG/deoiler cover interface is permitted if there are no drops seen in two minutes.
(d) Repair all leaks as necessary.
(e) Clean the gearbox, if necessary (Ref. AMM TASK 72-61-01-100-801).
(f) Check the gearbox again for leaks after all repairs.
(6) Do a visual inspection to make sure that the oil tank cap is completely closed.

Engine Oil System - Oil Tank and Cap ** ON A/C NOT FOR ALL

CAUTION: MAKE SURE THAT YOU CLOSE THE OIL TANK CAP COMPLETELY. MAKE SURE THAT THE OIL TANK CAP LEVER IS DOWN AND LOCKED. IF YOU DO NOT, OIL CAN COME OUT OF THE TANK AND AN IN-FLIGHT SHUTDOWN CAN OCCUR.

(a) Make sure that the cap is rotated to the closed position and the lever is completely down (locked) against the oil cap.
(7) Do a visual inspection of the Main Gear Box (MGB) breather

Engine Oil System - Right Side of Engine ** ON A/C NOT FOR ALL

(a) If oil leakage is identified from the No. 4 bearing scupper:
1 Do an inspection of the Magnetic Chip Collectors (MCC)s for oil contamination (Ref. AMM TASK 79-00-00-281-802).
a Remove the engine if the inspection results are not in the approved limits.
2 Do an idle power test (cowls closed) (Ref. AMM TASK 71-00-00-720-811).
a Hold at idle for 15 minutes after engine stabilization.
b Shutdown the engine (Ref. AMM TASK 71-00-00-860-814).
c After shutdown, wait for 30 minutes and do a check for oil leakage at the No. 4 bearing scupper.
3 If you cannot find oil leakage, continue to power assurance testing at Step (7)(a)4_.
a If you find oil leakage, remove the engine from service.
4 Do a power assurance test (Ref. AMM TASK 71-00-00-710-806).
a After shutdown, wait for 30 minutes and do a check for oil leakage at the No. 4 bearing scupper.
b If you cannot find oil leakage, the engine can continue in service.
c If you find oil leakage, remove the engine from service.
(b) If oil leakage is identified from the MGB breather, monitor oil consumption for the engine (Ref. AMM TASK 79-00-00-210-808).
1 Remove engine from service if oil consumption is not in limits.
(8) Do a visual inspection of the Turbine Exhaust Case (TEC) around the No. 5 and No. 6 bearing compartment.
(a) If oil leakage is identified from the No. 5 or No. 6 bearing area then monitor oil consumption for the engine (Ref. AMM TASK 79-00-00-210-808).
1 Remove the engine from service if oil consumption is more than the approved limits.
(9) Examine the assembly for foreign objects, damage, and correct assembly.

5. Close-up
Subtask 79-00-00-410-082-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 thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

Subtask 79-00-00-440-062-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 79-00-00-410-083-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 access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:41:18 UTC