Recommendation for Engine Preservation [CFML]

TASK 72-00-00-600-804-A
Recommendation for Engine Preservation

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

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2098)	desiccant bags
(Material No.CP2160)	vapor barrier film

B. Referenced Information

REFERENCE	DESIGNATION
TASK 72-00-00-620-802-A	Preservation of an Engine for a Period of 30 to 365 days
TASK 72-00-00-620-803-A	Preservation of an Engine for a Period up to 10 days
TASK 72-00-00-620-804-A	Preservation of an Engine for a Period up to 30 days
TASK 72-00-00-620-805-A	Preservation of an Engine for a Period up to 90 days
TASK 72-00-00-620-806-A	Preservation Procedure for Exceeded Long Term Preservation Period
TASK 72-00-00-620-807-A	Preservation Renewal Requirements
TASK 72-00-00-630-802-A	Depreservation of an Engine

3. Job Set-up
Subtask 72-00-00-860-117-A

A. Not Applicable

4. Procedure
Subtask 72-00-00-620-073-A

A. Recommendation for Engine Preservation
(1) Engine preservation:
(a) The procedures that follow are recommended as the necessary minimum, to protect the LEAP engine against corrosion, liquid and debris which go into the engine and atmospheric conditions during periods of storage and inactivity or which follow an engine-out ferry or landing which follows an in flight shut down. These procedures are also recommended for installed engines on an inoperative aircraft or an engine not to be operated for more than 30 days.
(2) Preservation tasks:
(a) The recommended procedure for preservation of the engine changes depending upon the duration of inactivity, the type of preservation used and if the engine is operable or non-operable.

NOTE: Engines that can be started are considered operable. Engines that for any reason cannot be started are considered non-operable. Preservation renewal procedures are also covered in this instruction.

(b) Select the preservation procedure and use the schedule that follows:

NOTE: An engine removed for shop-visit needs to be preserved for the duration the engine will be inoperative, including the shop-visit. Therefore, it is recommended to take into account the expected time engine will spend in shop-visit when selecting the task for preservation before engine removal.

1 Up to 10 days (Ref. AMM TASK 72-00-00-620-803).
2 Up to 30 days (Ref. AMM TASK 72-00-00-620-804).
3 Up to 90 days (Ref. AMM TASK 72-00-00-620-805).
4 Up to 30 to 365 days (Ref. AMM TASK 72-00-00-620-802).
5 Preservation renewal requirements (Ref. AMM TASK 72-00-00-620-807).
6 Procedure for exceeded long term preservation period (Ref. AMM TASK 72-00-00-620-806).
7 Depreservation (Ref. AMM TASK 72-00-00-630-802).
(3) Preservation program:
(a) These tasks give the instructions for the preservation, preservation renewal and depreservation for an operable and a non-operable engine.
(b) The preservation procedures for an operable engine give the minimum recommended steps that are necessary to prevent these conditions:

Corrosion
Entry of unwanted material into the engine
The effects of the climate and weather conditions.

(c) The preservation procedures for a non-operable engine give the minimum recommended steps that are necessary if you cannot start the engine.
(d) The preservation renewal procedure, if it is permitted, gives the instructions for the renewal of the preservation time.
(e) The depreservation procedure puts the installed engine back in operation.
(f) The preservation procedures are different for different periods of non-operational time, different types of preservation procedures and if the power plant is operable or not operable:
1 Power plant preservation is a flexible program that you can do and must agree with the applicable weather and storage conditions.
2 Extra care is necessary for a program for power plants that are operational in high humidity or large temperature changes or near a salt water area, than for the power plants that are in drier climates or less bad weather conditions.
3 In case of engine storage in an environment with a humidity level that is higher than 70%, put in place desiccant bags (Material No.CP2098) and humidity indicator card (locally manufactured) in the inlet and the exhaust in order to monitor the humidity level.

NOTE: The best condition for engine storage is to keep an environment with less than 70% of humidity.

a Make sure that the desiccant bags (Material No.CP2098) are not in contact with the engine hardware.
b If necessary, use vapor barrier film (Material No.CP2160) to protect locally the engine hardware.
c Attach humidity indicator card (locally manufactured) to monitor humidity level during the preservation period.
d Ensure desiccant bags (Material No.CP2098) and humidity indicator cards are easily accessible.
4 When you use desiccants, you must inspect and change them regularly as applicable, taking into account environmental conditions, to make sure the desiccants give good protection. If indication of important humidity or saturated desiccant bags (Material No.CP2098) is noted during inspection, consider reducing inspection interval and increasing quantity of desiccant bags (Material No.CP2098) .
5 Installation of vapor barrier film (Material No.CP2160) in inlet and exhaust can help to seal properly engine flow path to ensure desiccant bags effectiveness.

NOTE: This will make sure that the desiccants give good protection.

6 Do a schedule for the preservation programs for power plants that are not operable to do the preservation renewal procedures and monitor the schedule regularly to make sure that you did the necessary procedure before the expiration time.
7 Examine the preservation of the power plant as the weather conditions and conditions of power plant protection change and do the procedures necessary to keep the power plant in an operable condition.

NOTE: You cannot do the preservation of engines and put them into storage without maintenance. You must do a schedule and apply it.

CAUTION: IT IS NOT PERMITTED TO USE: - WHITE TESA 4651 TAPE - GREY TESA 4651 TAPE - YELLOW TESA 4651 TAPE - RED TESA 4651 TAPE - GREEN TESA 4651 TAPE - RED TAPE 3M 471. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE PARTS CAN OCCUR.

8 Close the Variable Bleed Valve (VBV) doors when you do the preservation and store the power plant. As a minimum, when engine is to be stored for long term, removed from the aircraft or if maintenance is to be performed during preservation period, cover VBV grids with vapor barrier film (Material No.CP2160) . As an alternative, one of the following alternative VBV grids protections can be used:

Blue tape 3M 471 (CP2109)
Blue, brown or black tesa 4651 tape (CP2158).

NOTE: Make sure that no unwanted material goes into the core engine inlet through the VBVs.

9 After an engine had an in-flight shutdown or when you do the preservation for a long time an engine is not operable, contact CFM: cfm.csc@safrangroup.com.

[Rev.10 from 2021] 2026.04.01 13:03:33 UTC