Preservation/Depreservation of the Main Oil/Fuel Heat Exchanger [CFMB]

TASK 79-21-20-620-002-A
Preservation/Depreservation of the Main Oil/Fuel Heat Exchanger

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
To prevent damage to the fuel and oil circuits of the main oil/fuel heat exchanger, during its storage after removal.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	CONTAINER 3 L(3/4 USGAL)
No specific	AR	PLUG - BLANKING

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP5067)	lubrication system corrosion preventive oil

C. Referenced Information

REFERENCE	DESIGNATION
TASK 79-21-20-000-002-A	Removal of the Main Oil/Fuel Heat Exchanger

3. Job Set-up
Subtask 79-21-20-010-055-A ** ON A/C NOT FOR ALL

A. Remove the main oil/fuel main heat exchanger from the engine (Ref. AMM TASK 79-21-20-000-002).

4. Procedure
Subtask 79-21-20-620-050-A ** ON A/C NOT FOR ALL

A. Preservation of the main oil/fuel heat exchanger.
(1) Put lubrication system corrosion preventive oil (Material No.CP5067) in the oil and fuel circuits of the main oil/fuel heat exchanger.

NOTE: This oil contains a corrosion inhibitor.

(2) Install CAP - BLANKING and PLUG - BLANKING on all the open orifices.
(3) Turn and shake the unit for approximately one minute.

Subtask 79-21-20-630-050-A ** ON A/C NOT FOR ALL

B. Depreservation of the main oil/fuel heat exchanger.
(1) Put a CONTAINER 3 L(3/4 USGAL) under the main oil/fuel heat exchanger.
(2) Remove all blanking caps and plugs.
(3) Fully drain the oil and the fuel circuits.
(4) Install blanking caps and plugs if the unit is not re-installed on the engine immediately after the depreservation.

[Rev.10 from 2021] 2026.04.01 13:14:11 UTC