Draining of the Engine Surface Air Cooling Oil Cooler (SACOC) Left and Right (by Gravity)

TASK 12-13-79-610-804-A
Draining of the Engine Surface Air Cooling Oil Cooler (SACOC) Left and Right (by Gravity)

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.

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	1	AIR SOURCE FILTERED, DRY
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
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 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
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 79-21-30-000-802-A	Removal of the Engine Surface Air Cooling Oil Cooler (SACOC)
TASK 79-21-30-400-802-A	Installation of the Engine Surface Air Cooling Oil Cooler (SACOC)
Draining of the Left Engine SACOC and the Right Engine SACOC

3. Job Set-up
Subtask 12-13-79-941-073-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, and
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 12-13-79-010-073-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 12-13-79-040-050-A

C. Deactivation of the Thrust Reverser System 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 78-30-00-040-807).

Subtask 12-13-79-010-074-A

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

4. Procedure
Subtask 12-13-79-680-064-A

A. Draining of the Engine Surface Air Cooling Oil Cooler (SACOC) Left and Right (by Gravity)

Draining of the Left Engine SACOC and the Right Engine SACOC

(1) Remove the left engine SACOC (1) and right engine SACOC (2) (Ref. AMM TASK 79-21-30-000-802).
(2) Put a CONTAINER 5 L (1.32 USGAL) below the left engine SACOC (1) and the right engine SACOC (2).

WARNING: WHEN YOU USE COMPRESSED AIR:

USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS
DO NOT LET THE PRESSURE BE MORE THAN 30 PSIG (200 KPA).

LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.

(3) Do the draining of the left engine SACOC (1) and the right engine SACOC (2) as follows:

NOTE: It is permitted to use AIR SOURCE FILTERED, DRY through the oil inlet port (3) and oil inlet port (5) to remove the oil from the left engine SACOC (1) and the right engine SACOC (2).

(a) Drain the oil from the left engine SACOC (1) through the oil outlet port (4).
(b) Drain the oil from the right engine SACOC (2) through the oil outlet port (6).
(4) Install the left engine SACOC (1) and the right engine SACOC (2) (Ref. AMM TASK 79-21-30-400-802).

5. Close-up
Subtask 12-13-79-410-073-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 12-13-79-440-050-A

B. Do the reactivation of the thrust reverser after maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 12-13-79-410-074-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] 2026.04.02 06:45:27 UTC