Visual Inspection of the Oil System (Fan Cowls and Thrust Reversers Opened) [CFML]

TASK 79-00-00-210-814-A
Visual Inspection of the Oil System (Fan Cowls and Thrust Reversers Opened)

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

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	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1039)	Acetone
(Material No.CP2010)	White spirit
(Material No.CP2011)	Stoddard solvent
(Material No.CP2559)	Ardrox 552
(Material No.CP2560)	Turco IND 79
(Material No.CP2566)	Mag-chem tecksol
(Material No.CP2584)	Degreasol 99 R
(Material No.CP2656)	Mag-chem skysol

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-710-815-A	Idle Leak Check
TASK 71-00-00-790-807-A	Leak Test between Equipments and Accessory Gearbox (AGB) Pad
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 72-00-00-200-815-A	Inspection of Engine Tubes, Hoses and Fittings
TASK 72-59-81-000-801-A	Removal of the Oil Supply Tube
TASK 72-59-81-000-802-A	Removal of the Oil Supply Damper Tube
TASK 72-59-81-100-801-A	Cleaning of the Oil Supply Tubes and the Oil Supply-Damper Tubes
TASK 72-59-81-200-801-A	Visual Inspection of the Oil Supply Tubes and the Damper Oil Supply Tubes
TASK 72-59-81-400-801-A	Installation of the Oil Supply Tube
TASK 72-59-81-400-802-A	Installation of the Oil Supply Damper Tube
TASK 72-63-00-000-802-A	Removal of the Accessory Gearbox (AGB) Assembly
TASK 72-63-00-400-802-A	Installation of the Accessory Gearbox (AGB) Assembly
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
TASK 79-00-00-210-815-A	Visual Inspection of the Aft Sump Oil-System
Visual Inspection of the Oil System (Fan Cowls and Thrust Reversers Open)

3. Job Set-up
Subtask 79-00-00-941-092-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) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
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) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 79-00-00-010-100-A

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

Subtask 79-00-00-040-064-A

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) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 79-00-00-010-101-A

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL, 462AR.

4. Procedure
Subtask 79-00-00-210-099-A

A. Visual Inspection of the Oil System (Fan Cowls and Thrust Reversers Open)
(1) Do the visual inspection for sign of leakage of the components that follow:

Internal parts of the left fan cowl panel (1)
Internal parts of the right fan cowl panel (2)
Internal parts of the left thrust reverser (4)
Internal parts of the right thrust reverser (3)
Engine surface
Oil tank (5)
Non-return valve (6)
Lubrication unit (9)
Accessory drive train (7) and fan frame (8) interfaces.

(2) Do the visual inspection for signs of leakage of the tubes and attachment parts that follows:
(a) If there is damage, replace the tube (Ref. AMM TASK 72-00-00-200-815).
(3) Leakage is not permitted.

NOTE: It is usual to find oil marks (spots) on the thrust reverser cowls at locations facing with the Turbine Rear Frame (TRF) holes:

Strut 7 oil supply port at the 5 o'clock location
Strut 8 oil scavenge port at the 6 o'clock location
Strut 9 oil drain port at the 7 o'clock location
Visual Inspection of the Oil System (Fan Cowls and Thrust Reversers Open)

NOTE: Staining or wetting is permitted.

NOTE: Some components may show seepage during the production and delivery process.
During the engine assembly, the seals, gaskets, joints and B-nuts are lubricated with production assembly oil or vaseline. During the first run flight, this lubrication can form drops on components.
Production assembly oil is dark brown compared to engine oil which is a golden color.
Vaseline can be distinguished from fuel and oil by its thickness at room temperature.
Vaseline is less fluid than fuel or engine oil.
The presence of assembly lubrication does not indicate oil or fuel leak and is normal for new engine operation.
In case of production assembly oil or vaseline presence, clean the area according to Para. 4.A.(4)(a).
In case of doubt on the nature of the fluid, contact CFM support cfm.csc@safrangroup.com.

(4) If the leakage is suspected, do the steps as follows:
(a) Clean the suspected area with Stoddard solvent (Material No.CP2011) or Acetone (Material No.CP1039) or Ardrox 552 (Material No.CP2559) or Turco IND 79 (Material No.CP2560) or Mag-chem tecksol (Material No.CP2566) or Degreasol 99 R (Material No.CP2584) or Mag-chem skysol (Material No.CP2656) or White spirit (Material No.CP2010) .
(b) Alternate procedure available. Operate the engine at 70 percent of N1 or above to pressurize the oil system and to get accurate reading during leak test (Ref. AMM TASK 71-00-00-710-815).

NOTE: In some marginal cases, leaks at the Accessory Gearbox (AGB) pad seal or damaged O-rings at equipment drive shaft level can be isolated by engine runs at higher engine power runs.

(c) Alternate procedure. Do the static leak check of AGB pad seals (Ref. AMM TASK 71-00-00-790-807).
(d) Do the visual inspection for signs of leakage of the suspected area.
(e) If leakage is identified, tighten the connecting nuts to the appropriate torque values and/or replace the defective components (Ref. AMM TASK 72-63-00-000-802) and (Ref. AMM TASK 72-63-00-400-802).
(5) If there is no external oil leakage, do the visual inspection of the oil supply tube (11), the oil supply-damper tube (10) and the oil scavenge tube (12) at the TRF (13) strut port interface for oil leakage and coking.
(a) If there is an oil leakage and a sufficient quantity of oil coking at the TRF (13) interface, do the visual inspection of the aft sump oil system (Ref. AMM TASK 79-00-00-210-815).
(b) If the oil scavenge tube (12) drain hole (15) is found to be blocked, contact CFM cfm.csc@safrangroup.com.
(c) If the oil supply tube (11) and/or oil supply-damper tube (10) drain holes (14) are found to be blocked, do the following steps:

Remove the affected tube (Ref. AMM TASK 72-59-81-000-801) (supply) and/or (Ref. AMM TASK 72-59-81-000-802) (supply-damper).
Do the visual inspection of the aft sump oil system (Ref. AMM TASK 79-00-00-210-815).
Remove coked oil in the TRF (13) strut, if any.
Clean the affected tube (Ref. AMM TASK 72-59-81-100-801).
Do the visual inspection of the affected tube (Ref. AMM TASK 72-59-81-200-801).
Re-install the oil tube or install a new oil tube (Ref. AMM TASK 72-59-81-400-801) (supply) and/or (Ref. AMM TASK 72-59-81-400-802) (supply-damper).

5. Close-up
Subtask 79-00-00-410-086-A

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 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL, 462AR.

Subtask 79-00-00-440-064-A

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 79-00-00-410-087-A

C. Close Access
(1) 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.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:57:41 UTC