Visual Inspection of the SACOC [CFML]

TASK 79-21-30-210-801-A
Visual Inspection of the SACOC

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 2M (6 FT) - ADJUSTABLE
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 78-30-00-040-809-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 79-21-30-000-802-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)
Air Surface Cooling Oil Cooler Engine (SACOC)

3. Job Set-up
Subtask 79-21-30-941-057-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 a 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 79-21-30-010-063-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 2M (6 FT) - ADJUSTABLE in position.

Subtask 79-21-30-040-054-A

C. Deactivation of the Thrust Reverser Ground 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 ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 79-21-30-010-064-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 79-21-30-200-050-A

A. Visual Inspection of SACOC
(1) Visual Inspection of the Engine Surface Air Cooling Oil Cooler (SACOC) (Left) (1) and Engine SACOC (Right) (2)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Visual inspection of all the areas for:
A.Cracks	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
2.Visual inspection of Zone A (bottom fin plate) (3) for:
A.Nicks and scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
B.Dents	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
3.Visual inspection of Zone B (top ramp fairing) (9) for:
A.Nicks and scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
B.Dents	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
4.Visual inspection of Zone C (grooves) (13) for:
A.Worn, stripped or crossed threads	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
5.Visual inspection of Zone D (manifold perimeter surfaces) (15) for:
A.Scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
B.Dents	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
6.Visual inspection of Zone E (edges) (4) for:
A.Nicks	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
7.Visual inspection of Zone F (16) for:
A.Nicks	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
B.Scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
8.Visual inspection of Zone G (14) for:
A.Nicks	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
9.Visual inspection of Zone H (fins) (5) for:
A.Scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
B.Bent	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
C.Unrefinement of mesh density	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
10.Visual inspection of Zone I (only fin plate) (6) for:
A.Nicks and scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
11.Visual inspection of Zone J (cover and bypass) (10) for:
A.Nicks and scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
12.Visual inspection of Zone K (bottom ramp fairing) (7) for:
A.Nicks and scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
B.Dents	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
13.Visual inspection of Zone L (manifold upper surface) (17) for:
A.Scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
14.Visual inspection of Zone M (top ramp fairing) (11) for:
A.Nicks and scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
B.Dents	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
15.Visual inspection of Zone N (only fins) (8) for:
A.Nicks	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
B.Scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
16.visual inspection of Zone O (ramp fairing) (12) for:
A.Nicks and scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).
17.Visual inspection of Zone P (manifold upper surface) (18) for:
A.Scratches	Not serviceable	Replace the applicable engine SACOC (Ref. AMM TASK 79-21-30-000-802) and (Ref. AMM TASK 79-21-30-400-802).

5. Close-up
Subtask 79-21-30-410-057-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 79-21-30-440-053-A

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

Subtask 79-21-30-410-058-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 13:03:36 UTC