(2)  
Where it is applicable, different instructions are given for engines that are not installed (off-wing).

 B.  
Preservation instructions give the procedures recommended as the minimum steps necessary to prevent unwanted liquid and materials in the power plant, corrosion, and atmospheric conditions during times of storage and no operation, or landing after an in-flight shutdown.

 C.  
Preservation renewal, if permitted, gives the instructions for the renewal of the preservation period.

 D.  
Depreservation instructions consists of steps that put a power plant back to the usual operational condition.

 E.  
The procedures are different for different lengths of no operation time, different types of preservation used, and if the power plant is serviceable or not serviceable.

 NOTE: For this procedure, the definition of an engine that is
____ serviceable and an engine that is not serviceable is as follows: A serviceable power plant is one that can be started; a power plant that is not serviceable is one that cannot be started.
 F.  Do the applicable procedure from the schedule that follows:
 (1)  
Up to 10 Days Preservation -Serviceable Power Plant and Not Serviceable Power Plant

 (2)  
Up to 10 Days Preservation Renewal -Serviceable Power Plant and Not Serviceable Power Plant

 (3)  
Up to 30 Days Preservation -Serviceable Power Plant and Not Serviceable Power Plant

 (4)  
Up to 30 Days Preservation Renewal -Serviceable Power Plant and Not Serviceable Power Plant

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 71-00-03
 ALL  ú ú C01 Page 201 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(5)  
Up to 30 Days Depreservation - Not Serviceable Power Plant

 (6)  
Up to 90 Days Preservation - Serviceable Power Plant

 (7)  
Up to 90 Days Preservation Renewal - Serviceable Power Plant

 (8)  
30 to 365 Days Preservation -Serviceable Power Plant and Not Serviceable Power Plant

 (9)  
30 to 365 Days Preservation Renewal -Serviceable Power Plant and Not Serviceable Power Plant

 (10)
 30 to 365 Days Depreservation - Serviceable Power Plant

 (11)
 Long Term Preservation Period (365 Days) Exceeded -Serviceable Power Plant

 (12)
 Engine Dry-Out Procedure

 G.  
Preservation procedures in this section are recommended as an aid to find the necessary precautions that you must do to give sufficient protection to the power plant from the elements during times of storage and no operation.

 (1)  
Power plant preservation is a flexible program that can be done in such a way which best agrees with the applicable weather and storage conditions.

 (2)  
More care is necessary for a program for power plants that are not 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.

 H.  
You must make a schedule for the preservation programs for power plants that are not serviceable to do the preservation renewal procedures and monitor the schedule regularly to make sure the necessary procedures are done before the expiration of preservation time.

 I.  
You must 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 a serviceable condition.

 NOTE: Engines cannot be preserved and put into storage without
____ maintenance. A schedule must be (as disciplined as for a power plant in revenue service) made and then completed.
 J.  When desiccants are used they must be changed regularly, applicable to environmental conditions, to keep the desiccant effective.
 K.  It is recommended that you pump the variable bleed valves (VBV) closed (AMM 75-32-00/201) when the power plant is to be preserved and stored. This will prevent unwanted material in the core engine inlet through the VBV's.
 L.  If a power plant is preserved for more than the long term preservation time (365 days), you must do the power plant operation procedure to make sure the power plant is serviceable before you put the power plant back into service or preserve the engine for a longer time.
　
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