than that afforded by Level C preservation and packaging.

Level C is the level of preservation that protects adequately against corrosion, deterioration, and physical damage during shipment from the supply source to the first receiving activity for immediate use.

The proper level of preservation depends on the availability of information on the probable handling, shipping, storing units, and conditions that the vehicles and equipment will undergo before final issue to the command. Physical characteristics of the vehicles and equipment must also be considered.

An approved cleaning technique is a first in preservation. The effectiveness of an applied preservative may be measured by the quality of the surface preparation. All corrosion and contaminants have to be removed before a preservative is applied.

No single cleaning method or material is suitable for all cleaning situations. The selection of a cleaning method, or combination of methods, depends on one or more of these factors:

1. Material composition of part

2. Complexity of construction and assembly

3. Nature and extent of contaminants

4. Amount and age of equipment

5. Availability of cleaning materials and equipment

Steam cleaning is suitable for removal of greases, tar, road deposits, and other contaminants. This process is particularly adaptable to parts other than the ENGINE and GEARCASE EXTERIORS of vehicles and equipment that ordinarily would not be disassembled before preservation. Engines and gearcases should be cleaned by spraying with a decreasing solvent, by allowing for solvent penetration, and, finally, by flushing with a clean petroleum solvent or by wiping with a clean cloth.

"Active storage" means that complex equipment is maintained in serviceable condition by the operation of all components for brief periods at regularly scheduled intervals. When lubricants are redistributed, friction is reduced and deterioration is prevented or reduced to a minimum. Only unboxed automotive and construction equipment is included in the active storage program.

Upon reactivation, material preserved and packaged for storage or shipment requires depreservation and servicing before use. Equipment is to be lubricated under the manufacturer's instructions. Seals and closures should be removed. Housings, casings, and other enclosures should be drained of preservatives and refilled with specified operating fluids before operation. Those components that were removed for storage should be reinstalled.

Upon activation, in equipment containing piston-cylinder components, such as internal combustion engines and air compressors, rotate the crankshaft slowly with the throttle closed, ignition off, and compression release lever (if so equipped) in START position.

Avoid abrasives in removing preservatives. Remove blocking, wiring, or strapping from clutch levers or pedals secured in a partially disengaged position. Adjust drive belts on which tension has been released. Flush from the system any corrosion inhibitor mixed with preservative oil.

TECHNIQUES OF SCHEDULING

An effective and efficient maintenance program requires the establishment and upkeep of a preventive maintenance scheduling system and a sound shop control procedure. According to

Management of Transportation Equipment, NAVFAC P-300, vehicles and equipment are to be scheduled for inspection and servicing according to the time, mileage, or operating hours prescribed by the manufacturer's recommendations. As a minimum, the schedule is to ensure that each vehicle is inspected for safety at least every 12 months or 12,000 miles, whichever occurs first. The schedule can be formulated by determining the estimated annual miles of each vehicle and dividing by the manufacturer's recommended service interval. This will determine the number of service intervals per year for each vehicle. Dividing the number of working days per year (252) by the number of service intervals per year will develop the number of working days between