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Serial/Lot Item Tracking

Serial/Lot Item Tracking (SLIT) is required for airand surface-launch missiles and boosters. SLIT provides for the complete tracking of certain items from birth to death by their unique serial or lot number.

Fleet units must SLIT-report on-loads from or off-loads to CONUS shore activities. They must also report intership transfers, expenditures, and condition code changes of all-up-rounds (AURs) and their components. SLIT reporting is required of both the receiving and issuing ships when an intership transfer is involved. The receiving/issuing ship must address each other for information on ATR message submissions. This requirement enables each ship to verify the transfers, correct any discrepancies, and submit the appropriate modified ATRs to SPCC.

All items that require SLIT reporting are contained in publication TW010-AA-ORD-010/NAVAIR 11-1-116A.


LEARNING OBJECTIVES: Discuss the calibration and repair of test/measuring equipment.

In the typical weapon system work center, there are several different devices (tools, test sets, and gauges) that are used to measure some component or function to a required standard. If these measuring devices are not maintained within the designed operating parameters, it only follows that your equipment will not function within its designed specifications. Three types of test, measuring, and diagnostic equipment (TMDE) are used with which you will be concerned:

1. Electronic Test Equipment (ETE). Electronic test equipment is broken down into two categories:

a. General-Purpose Electronic Test Equipment (GPETE). General-purpose electronic test equipment has the capability, without modification, to generate, modify, or measure a range of parameters of electronic functions required to test two or more equipments or systems of basically different designs. An oscilloscope would be classified as GPETE.

b. Special-Purpose Electronic Test Equipment (SPETE). Special-purpose electronic test equipment is specifically designed to generate, modify, or measure a range of parameters of electronic functions of a specific or peculiar nature required to test a single prime equipment or system. An example of a SPETE is the Mk 363 Missile Electrical System Test Set (MESTS) used with the ASROC launcher.

2. Electrical Test Equipment. Electrical test equipment is any device that is specifically designed and primarily used to measure the basic parameters of current, voltage, resistance, and frequency of electrical power distribution equipment or systems. An example of electrical test equipment is a multimeter.

3. Mechanical Test Instrument (MTI). A mechanical test instrument is any device that is used to test, inspect, or diagnose a range of parameters in the measurement areas of pressure, temperature, flow, linear, optical, torque, weight, mass, and vibration. Torque wrenches, flow control metering valves, pressure gauges, and thermometers are just a few of the devices that are classified as MTIs.


The Navy Metrology and Calibration (METCAL) Program was instituted to help provide calibration facilities so that sophisticated equipment, precise standards, and laboratory conditions would be available. Various echelons of calibration activities were established to meet these calibration requirements. These echelons are integrated so that each level activity has traceable standards tied to the highest standards available for calibration. We will describe the following calibration echelons:

National Bureau of Standards (NBS)

Metrology Engineering Center (MEC)

Navy Standards Laboratory-Type I

Navy Standards Laboratory-Type II

Navy Calibration Laboratory (NCL)

Fleet Calibration Laboratory (FCL)

Field Calibration Activity (FCA)

National Bureau of Standards (NBS)

The National Bureau of Standards (NBS) is the chartered agency of the federal government having custody of the nation's basic physical standards (national standards). It provides the common reference for all measurements made within the scope of the Navy calibration program and certifies the Navy standards submitted by the Navy Type I Standards Laboratories according to an approved schedule.

Metrology Engineering Center (MEC)

The Metrology Engineering Center (MEC) is an engineering group responsible for the technical coordination of the Navy calibration program. It is under the management control and technical guidance of the Naval Sea Systems Command (NAVSEASYSCOM). The Metrology Engineering Center is located at the Naval Industrial Reserve Ordnance Plant, Pomona, California, and is under the military command of the Naval Plant Representative Office, Pomona, California.

Navy Standards Laboratory-Type I

The Type I laboratories maintain the highest standards within the Navy calibration program. They maintain and disseminate measurements of the highest accuracy within the program. They obtain calibration services from NBS and provide calibration of laboratory standards and associated measuring equipment received from Type II standards laboratories and calibration laboratories.

Navy Standards Laboratory-Type II

The Type II laboratories furnish the second highest calibration services to assigned geographic areas within the naval establishment. They obtain standard

calibration services from the cognizant Type I Navy Standards Laboratory and calibrate laboratory standards and associated measurement equipment received from lower echelon laboratories.

Navy Calibration Laboratory (NCL)

NCLs are located in shipyards, ship repair facilities, and at various NAVELEX field activities. An NCL is usually made up of a Reference Standards Laboratory (RSL) and one or more Local Standards Laboratories (LSLs). The RSL is a Type II laboratory. The LSL normally receives calibration from the RSL.

Field Calibration Laboratory (FCL)

The FCLs are established aboard tenders and repair ships and at selected shore activities. They provide calibration for fleet-held and selected shore-based activities' test equipment. The equipment submitted for calibration by ships will be funded by the shore activity or its sponsor.


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