DOC AIRBUS | AMM A320FRecommendations for Engine Preservation [CFMB]
TASK 72-00-00-600-026-A
Recommendations for Engine Preservation
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Consumable Materials
B. Referenced Information
3. Job Set-up
Subtask 72-00-00-869-073-A ** ON A/C NOT FOR ALL
Subtask 72-00-00-620-062-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:40:28 UTC
Recommendations for Engine Preservation
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 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 72-00-00-600-006-A | Preservation for a Period of up to 30 Days |
| TASK 72-00-00-600-007-A | Preservation for a Period of 30 to 365 Days |
| TASK 72-00-00-600-008-A | Preservation Renewal Requirements. |
| TASK 72-00-00-600-009-A | Procedure for Exceeded Long Term Preservation Period. |
| TASK 72-00-00-600-025-A | Preservation for a Period of up to 90 Days |
| TASK 72-00-00-600-027-A | Depreservation |
| TASK 72-00-00-600-811-A | Desiccant Bags Inspection Procedure |
| TASK 75-31-20-820-001-A | Set the Variable Bleed Valve Assembly to the Closed position |
Subtask 72-00-00-869-073-A ** ON A/C NOT FOR ALL
A. Not Applicable
4. ProcedureSubtask 72-00-00-620-062-A ** ON A/C NOT FOR ALL
A. Engine preservation
(1) The procedures that follow are recommended as the necessary minimum, to protect the CFM56 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 (IFSD). These procedures are also recommended for installed engines on an inoperative aircraft or an engine not to be operated for more than thirty days.
(2) Preservation Tasks
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.
(a) Up to 30 days (Ref. AMM TASK 72-00-00-600-006).
(b) Up to 90 days (Ref. AMM TASK 72-00-00-600-025).
(c) 30 to 365 days (Ref. AMM TASK 72-00-00-600-007).
(d) Preservation renewal requirements (Ref. AMM TASK 72-00-00-600-008).
(e) Procedure for exceeded long term preservation (Ref. AMM TASK 72-00-00-600-009).
(f) Depreservation (Ref. AMM TASK 72-00-00-600-027).
The preservation procedures in this section are recommended as a guide to determine what precautions must be applied to give the engine sufficient protection from the elements during periods of storage and inactivity. Engine preservation is a flexible program that should be implemented in such a manner as to conform with particular weather and storage conditions. You must pay more attention to the preservation program for inactive engines exposed to high humidity and/or large temperature changes, especially if they are near a salt water area. These definitely require more attention to preservation needs than those inactive engines stored in drier climates or less severe weather conditions.
(5) The preservation program for spare and/or stored engines must be scheduled before you implement the preservation renewal requirements and monitored regularly to make sure that the necessary action is implemented before expiration of the preservation period. Depending upon weather conditions and the condition of the engine protection equipment covers, the effectiveness of the preservation protection must be analysed and modified in order to keep the engine in serviceable condition.
(b) If necessary, use vapor barrier film (Material No.CP2160) to locally protect the engine hardware.
(c) Attach humidity indicator card (locally manufactured) to monitor humidity level during the preservation period.
(d) Ensure desiccant bags and humidity indicator cards are easily accessible when you use desiccants, you must inspect and change them regularly as applicable to the environmental conditions ( (Ref. AMM TASK 72-00-00-600-811) for desiccant bags inspection and replacement).
This prevents the possibility of foreign objects going into the core engine inlet through the VBV's. For closure of the VBV doors, refer to (Ref. AMM TASK 75-31-20-820-001).
(1) The procedures that follow are recommended as the necessary minimum, to protect the CFM56 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 (IFSD). These procedures are also recommended for installed engines on an inoperative aircraft or an engine not to be operated for more than thirty days.
(2) Preservation Tasks
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.
(3) Select the preservation procedure and use the schedule that follows: (a) Up to 30 days (Ref. AMM TASK 72-00-00-600-006).
(b) Up to 90 days (Ref. AMM TASK 72-00-00-600-025).
(c) 30 to 365 days (Ref. AMM TASK 72-00-00-600-007).
(d) Preservation renewal requirements (Ref. AMM TASK 72-00-00-600-008).
(e) Procedure for exceeded long term preservation (Ref. AMM TASK 72-00-00-600-009).
(f) Depreservation (Ref. AMM TASK 72-00-00-600-027).
NOTE: There is no restriction on the number of times you can do the preservation procedure again, as long as it is accomplished each year.
(4) Preservation Program The preservation procedures in this section are recommended as a guide to determine what precautions must be applied to give the engine sufficient protection from the elements during periods of storage and inactivity. Engine preservation is a flexible program that should be implemented in such a manner as to conform with particular weather and storage conditions. You must pay more attention to the preservation program for inactive engines exposed to high humidity and/or large temperature changes, especially if they are near a salt water area. These definitely require more attention to preservation needs than those inactive engines stored in drier climates or less severe weather conditions.
(5) The preservation program for spare and/or stored engines must be scheduled before you implement the preservation renewal requirements and monitored regularly to make sure that the necessary action is implemented before expiration of the preservation period. Depending upon weather conditions and the condition of the engine protection equipment covers, the effectiveness of the preservation protection must be analysed and modified in order to keep the engine in serviceable condition.
NOTE: You cannot preserve and place engines in storage and then forget them. A correct plan (as given for an engine in revenue service) must be scheduled and then implemented.
(6) In case of engine storage environmental humidity level that is higher than 70 percent, put in place desiccant bags (Material No.CP2098) and humidity indicator card (locally manufactured) in the inlet and in 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 percent humidity.
(a) Make sure that the desiccant bags are not in contact with the engine hardware.(b) If necessary, use vapor barrier film (Material No.CP2160) to locally protect the engine hardware.
(c) Attach humidity indicator card (locally manufactured) to monitor humidity level during the preservation period.
(d) Ensure desiccant bags and humidity indicator cards are easily accessible when you use desiccants, you must inspect and change them regularly as applicable to the environmental conditions ( (Ref. AMM TASK 72-00-00-600-811) for desiccant bags inspection and replacement).
NOTE: 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. This will make sure that the desiccant gives good protection.
(7) It is recommended that the variable bleed valves (VBV) must be closed when the engine is to be preserved and stored or when you do maintenance in this area. This prevents the possibility of foreign objects going into the core engine inlet through the VBV's. For closure of the VBV doors, refer to (Ref. AMM TASK 75-31-20-820-001).