Хорошев / ИЛП_материал_маг_02.15 / Спецификация AECMA Specification 2000M / MIL-STD-1388-2B

The sum of the Failure Mode Criticality Numbers related to the failure modes of an item within specific severity classifications and mission phases . The following formula may be used to calculate Item Cr:

where

Cr = Criticality number for the item

cm -= Failure mode criticality number, DED 133

n = The failure modes in the items that fall under a particular severity classification/mission phase combination

j= Last failure mode in the item under the severity classification/mission phase combination

A part of nomenclature which provides a method for identifying equipment, usually by broad performance and use characteristics and general configuration. It is a data chain consisting of all or part of the data elements type, model, and series designators, in that order. A suffix may be added for use with the Joint Electronics Type Designation System. Instructions for coding the type, model, and series designators are contained in MIL-STD-482, appendix II, CM51 and consists of the following subfields:

A broad categorization of equipment based upon function or use.

Identifies equipment within a particular type designator having essentially the same performance characteristics.

Identifies equipment within a particular model designator having the same basic design, but not necessarily the same configuration.

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APPENDIX E

Supplemental information used with type, model, series designators for items using the Joint Electronics Type Designation Systems. Instructions

for coding suffix designator can be found in the following publications:

MIL-STD-875 Type Designation System for

Aeronautical and Support Equipment

MIL-STD-879 Designation for Aircraft Propulsion

Gas Turbine Engines

ANA Bulletin 395 Naval Ordnance Requirements, Mark and Mod Nomenclature System

END ARTICLE ITEM DESIGNATOR. The item designator code of the end article used in the 070 Report.

SYSTEM EQUIPMENT ITEM DESIGNATOR. The item designator code of the system equipment item.

SYSTEM/EI ITEM DESIGNATOR CODE. The item designator code of the system/ end item.

A narrative description identifying the function, specifications, and tolerances of the item under analysis (e.g. , supply 10 gallons per minute of hydraulic fluid at 3,000 psi for normal activation of pilot’s canopy, hose, main landing gear extension, wheel brakes, and flap extension).

A single character indicating whether an item of supply shall be subject to integrated management or shall be retained by the individual military

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services or other DOD components. The IMC is applicable to all NSN items in those commodity areas assigned for integrated material management. Definitions of IMC are contained in DOD-4100.38-M.

An identifying noun with appropriate adjective modifier, as contained in Federal Item Name Directory for Supply Cataloging, H6-1. Item Names con-

tained in Federal Item Name Directory for Supply Cataloging, H6-1, cannot be abbreviated unless approved by the requiring authority. When ab- breviation is approved by the requiring authority, the nonapproved item names can be abbreviated IAW MIL-STD-12.

INTEROPERABLE ITEM NAME. The name of the item that the end item under analysis is expected to interoperate with.

SUPERSEDURE ITEM NAME. An item name of the SE being superseded by or superseding the support equipment under analysis.

A number which serves as a cross-reference to each approved item name as contained in the Federal Item Name Directory for Supply Cataloging, H6-1. Names and noun concepts other than approved item names or noun concepts are assigned Item Name Code “77777”.

An index number assigned to an item for a specific illustration.

The combination of all human performance required for operation and maintenance of one personnel position in a system (e.g. driver).

An assigned code which is associated with a specific job.

The julian date consists of the last two numbers of the calendar year and the numeric day of the year, i.e. , February 5, 1990, would be 90036.

A narrative description identifying major factors which: (a) led to the decision that additional facilities, personnel, training, training material, support and test equipment, etc. , are required; or, (b) provided the basis for establishing the maintenance concept or making a major program decision.

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APPENDIX E

The average direct labor rate per hour for an Operations/Maintenance (O/M) Level. Labor rate is in units of dollars and cents.

Narrative information of the number, location by dimensions, and strength (rated, yield, and ultimate) of lifting and tiedown provisions for the item and major components removed for transport. Identified are the locations of hardpoint lifting provisions provided for aerial recovery. State if the lifting provisions meet criteria of MIL-STD-209 and interface with all aerial recovery and sling component.

A unique number assigned by the requiring authority to all items of equipment for which a specific service has proponency (see SB 700-20).

An LRU is an essential support item which is removed and replaced at field level to restore the end item to an operationally ready condition. Conversely, a non-LRU is a part, component, or assembly used in the repair of an LRU, when the LRU has failed and has been removed from the end item for repair.

A factor which is applied to the hourly and annual manpower costs to account for overhead, benefits, permanent change of station moves, hazardous duty, etc.

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APPENDIX E

A checklist consisting of 13 individual logistics factors impacting upon the attainment of specified maintainability goals for the item under analysis. An entry of Y, N, or Z is entered against each factor as depicted below.

The individual factors that constitute the subfields are:

Standardization. A logistic consideration indicating whether the design of the item under analysis meet the DOD policy to adapt, when possible, to: (a) common or compatible operational, administrative and logistic

Accessibility. A logistic consideration indicating whether admission to the various areas of the item under analysis can be achieved with relative ease.

Maintenance Ease. A logistic consideration indicating whether required maintenance can be performed without physical difficulty.

Safety. A logistic consideration indicating whether adequate design pro visions have been made to ensure the conservation of human life and effectiveness , and the prevention of damage to items, consistent with mission requirements.

Test Points. A logistic consideration indicating whether adequate design considerations have been made for test points on the item under analysis.

Skills . A logistic consideration indicating whether existing skills are available and sufficient to perform required maintenance on the item under analysis.

Training. A logistic consideration indicating whether adequate training programs have been planned for the performance of O/M tasks on the item under analysis.

Connectors for Ease of Removal. A logistic consideration indicating whether the item design includes the use of connectors to facilitate removal.

Packaging and Transportation. A logistic consideration indicating whether the packaging material and transportation mediums, designed for the item under analysis, will adequately protect it during transport.

Fault Location. A logistic consideration indicating whether adequate design provisions have been made to facilitate the location of the causes of failures or malfunctions of the item under analysis.

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Labeling. A logistic consideration indicating whether adequate parts associated with maintenance are identified and visible wit-h respect to circuit symbol or part identification.

Design for Self Protection Against Damage After Failure. A logistic consideration indicating whether provisions have been made to restrict the progress of deterioration after failure of the item under analysis.

Corrosion/Rust Control. A logistic consideration indicating whether adequate corrective or preventive actions have been developed to deter corrosion or rust damage to the item under analysis.

A single-position code assigned to adopted items and other items of material selected for authorization to provide a basis for logistical support decisions; i.e. , procurement, overhaul, repair parts provisioning, requisitioning, and distributing.

Identifies the activity name and code or office symbol responsible for logistics management decisions, or the system program manager/end article item manager.

A code that represents a functional or hardware generation breakdown/ disassembly sequence of system\equipment hardware including SE, training equipment, and installation (connecting) hardware.

mation on assignment of LCN, refer to appendix C.

ANNUAL OPERATING REQUIREMENT LCN. An LCN migrated from table AG that is required to identify the AORS measurement base.

FAILURE MODE TASK LCN. An LCN representing the failure mode against which a corrective or preventive task is documented.

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APPENDIX E

FUNCTIONAL LSA CONTROL NUMBER. An LCN representing the functional system/equipment breakdown.

PHYSICAL LSA CONTROL NUMBER. An LCN representing the hardware breakdown of the system/equipment.

REFERENCED LCN. An LCN that contains referenced task information.

REFERENCED SUBTASK LCN. An LCN that contains referenced subtask information.

S/N ITEM LSA CONTROL NUMBER. An LCN representing the item under analysis having a serial number relationship.

S/N PROVISIONING LSA CONTROL NUMBER. An LCN representing the provisioned item under analysis having a serial number relationship.

S/N PROVISIONING SYSTEM/EI LCN. An LCN representing the provisioned system/end item having a serial number relationship.

S/N SYSTEM/END ITEM LCN. An LCN representing the system/end item having a serial number relationship.

TASK LSA CONTROL NUMBER. An LCN of the item under task analysis.

TASK PROVISION LCN. An LCN of the item which is to be provisioned, based on the task analysis of the task LCN.

TASK REQUIREMENT LCN. An LCN of the item under task analysis.

UOC ITEM LSA CONTROL NUMBER. An LCN representing the item under analysis having a UOC relationship.

UOC PROVISIONING LSA CONTROL NUMBER. An LCN representing the provisioned item under analysis having a UOC relationship.

UOC PROVISIONING SYSTEM/EI LCN. An LCN representing the provisioned system/end item having a UOC relationship.

UOC SYSTEM/EI LCN. An LCN representing the system/end item having a UOC relationship.

UUT LSA CONTROL NUMBER. An LCN of the Unit Under Test.

A single-position code which reflects the relationship of the item to the total LSAR system. The LCN-IC depicts an item’s relationship based upon the assigned LCN, not to a subordinate, provisioned end item.

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APPENDIX E

An identifying noun with an appropriate adjective modifier identifying the LCN item. When using the modified classical LCN assignment method, then “REPAIR PARTS” is used to identify an LCN representing more than one reference number and CAGE combination.

A code indicating whether the LCN is representative of either a physical or functional breakdown.

FMT LCN TYPE. An LCN-TYPE representing the failure mode against which either a corrective or preventive task is documented.

FUNCTIONAL LCN TYPE. An LCN-TYPE representing the functional system/ equipment breakdown.

PHYSICAL LCN TYPE. An LCN-TYPE representing the hardware breakdown of the system/equipment.

REFERENCED LCN TYPE. An LCN-TYPE that contains referenced task information.

REFERENCED SUBTASK LCN TYPE. An LCN-TYPE that contains referenced subtask information.

S/N ITEM LCN TYPE. An LCN-TYPE representing the item under analysis having a serial number relationship.

S/N SYSTEM/EI LCN-TYPE. An LCN-TYPE representing the system/end item having a serial number relationship.

TASK LCN TYPE. An LCN-TYPE of the item under task analysis.

TASK PROVISION LCN TYPE. An LCN-TYPE of the item which is to be provisioned, based on the task analysis.

TASK REQUIREMENT LCN TYPE. An LCN-TYPE of the item under task analysis.

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APPENDIX E

UOC ITEM LCN TYPE. An LCN-TYPE representing the item under analysis having a UOC relationship.

UOC SYSTEM/EI LCN TYPE. An LCN-TYPE representing the system/end item having a UOC relationship.

UUT LCN TYPE. An LCN-TYPE of the Unit Under Test.

A single-position code that indicates whether the support/test equipment is recommended as an LSA candidate.

A two-part sequence identifying the purchase/production lot quantity ranges to which the UM or UI price apply. The field is divided into two subfields for beginning and ending lot size.

The beginning Lot Quantity of the item to which the UM/UI PRICE applies.

UI PRICE LOT QUANTITY FROM. The UI price beginning lot quantity.

UM PRICE LOT QUANTITY FROM. The UM price beginning lot quantity.

The ending Lot Quantity of the item to which the UM/UI PRICE applies.

A code which indicates the required action to be taken at the expiration of the Maximum Allowable Operating Time (MAOT).

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APPENDIX E

A narrative description identifying the broad, planned approach to be

employed in sustaining the system/equipment at a defined level of readiness, or in a specified condition in support of the operational requirement. Initially stated by the requiring authority for design and support planning purposes and is expanded by performing activity prepared inputs during full-scale development. Provides the basis for the main- tenance plan. Usually includes guidelines pertaining to projected main- tenance tasks, levels, and locations: organic/contractor maintenance work load mix; condition monitoring, fault isolation and testing approach; and, compatibility with existing support and test equipment, etc. May be influenced or modified as system/equipment development proceeds.

The number of operational units (e.g. rounds, miles, hours) between preventive maintenance derived as an outcome of RCM analysis.

A number assigned by the government to identify an approved maintenance plan.

A narrative description of support data and analysis used in preparation of the maintenance plan. The impact of LSA including FMECA; RCM; and, level of repair analysis should be documented. In addition, the use of

data from like and similar equipment and lessons learned in formation should also be identified.

The MRRI is defined as the peacetime replacement rate factor for the item indicating the number of expected failures, which will require removal

and replacement of the support item below depot level in a given next higher assembly per equipment/end item per year. This factor is to be

based on the known/estimated end item usage and mature failure rates.

The MRRI can be calculated using the following formula:

For an assembly:

N

MRR (assembly) = E TFi X Quantity per taski i=l

Where:

N - Number of H function tasks for a given LCN/ALC combination (except D O/M levels)

TFi = Task frequency

For a repair part:

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