Attachment 9 Source Maintenance and Recoverability.pdf

Appendix A - 1 ATTACHMENT 9

Source, Maintenance, and Recoverability (SMR) Codes

SMR codes are used to communicate maintenance and supply instructions to the various logistic support levels. These codes are assigned to each support item based on the logistic support planning for the end item and its components. The SMR code is a six position alphanumeric entry. It is data product number

1220 of the Data Product Dictionary found in the LMI Specification (MIL-PRF 49506), and should be reported in Record B Block 22 of the LMI data product format (See LMI Worksheet Attachment 1 for format requirements).

1. Source Code. Codes entered in the first and second positions of the SMR Code indicating the source for acquiring the item for replacement purposes, i.e., procured and stocked, manufactured or assembled.

These codes are defined in Table I. The Source code is contained in the Weapon Systems File (WSF) level C in Data Element Number (DEN) D012.

2. Maintenance Code. Codes entered in the third and fourth positions of the SMR Code which consist of the Use Code and the Repair Code. There are three maintenance levels: Organizational, Intermediate, and

Depot. These codes are defined in Table II. The contractor shall assign the appropriate Use and Repair

Codes for each candidate spare or repair part. The Maintenance codes are contained in the WSF level C in

DENs D013A and D013B.

a. Use Code. The maintenance code entered in the third position will indicate the lowest maintenance level authorized to remove/replace, and use the item. The decision to code the item for removal and replacement at the indicated maintenance level will require that all the resources necessary to install and assure proper operation after installation of a replacement item (i.e., pre-installation inspection, testing and post-installation checkout) are provided.

b. Repair Code. The maintenance code entered in the fourth position indicates whether the item is to be repaired and identifies the lowest maintenance level with the capability to perform a complete repair action. The decision to code the item for repair at the indicated maintenance level requires that the proper logistics support (parts, manuals, training, tools, etc.) and all repair capability (remove, replace, repair, assemble, manufacture and testing for the support item) be provided or be available to that maintenance level. This does not preclude some minor repair which may be accomplished at a lower level of maintenance such as: simple replacement of minor items at the organizational level (fuses, light bulbs, screws, knobs, handles, etc.) Because of service differences in communicating maintenance information, a maintenance code entry in this position is not required by all services. Therefore this position is for optional use on intra-service equipments. When a maintenance code is not used a dash (-) sign will be entered. For multi-service equipments this position will contain a uniform maintenance code assigned by the service (s) requiring the code.

3. Recoverability Code. Code entered in the fifth position of the SMR Code which indicates the desired disposition of the support item. The Recoverability code is contained in WSF level C in DEN D013C.

(See Table III.)

4. Service Option Code. Code entered in the sixth position of the uniform format used to convey specific information to the logistic community and to the operating forces. This code is unique to each service and is utilized to disseminate specific instructions to that Service’s logistics business processes. The last segment of the SMR code is in WSF level C in DEN D012A. (See Table IV.)

Appendix A - 2 ATTACHMENT 9

TABLE I

UNIFORM SOURCE CODES

GENERAL: Source Codes are assigned to support items to indicate the manner of acquiring support items for maintenance, repair, rework or overhaul of end items. Source codes are entered in the first and second positions of the Uniform SMR Code format.

1. A Series Source Codes. A series source coded items are authorized for assembly at some level of maintenance. These codes should be assigned when all parts for assembly, the required support equipment and the skills required for the assembly are available at the specified level of maintenance. A source coded items require at least one P coded item in the assembly.

CODE DEFINITION

AD Item to be assembled at depot maintenance levels.

AF Item to be assembled at intermediate maintenance level.

Air Force - Intermediate(*) Marine Corps - 3rd Echelon

Army - Direct Support Navy - Afloat

AG Item to be assembled at both afloat and ashore intermediate maintenance levels - Navy use only.

AH Item to be assembled at intermediate maintenance level.

Air Force - Intermediate(*) Marine Corps - 4th Echelon

Army - General Support Navy - Ashore

AL Item is to be assembled at a specialized repair activity (e.g., item requires specialized tests and fixtures to insure proper assembly).

AO Item to be assembled at organizational level.

2. K SERIES SOURCE CODES. K series source coded items are contained in kits and do not / will not have an NSN assigned. Note: In those instances where an item is part of a kit and is also an item extraneous to the kit, the P series source code will take precedence.

KB Item included in both a depot overhaul/repair kit and a maintenance kit.

KD An item contained in a depot overhaul/repair kit and not purchased separately. Depot kit defined as a kit that provides items required at the time of depot overhaul or repair.

KF An item contained in a maintenance kit and not purchased separately. Maintenance kit defined as a kit that provides an item that can be replaced at organizational or intermediate levels of maintenance.

Appendix A - 3 ATTACHMENT 9

3. M series Source Codes. M series source coded items are to be manufactured or fabricated at some level of maintenance. They are normally consumable items or those requiring very limited repair (e.g., bending, painting, alignment, etc.). The assignment of this code should be based primarily on the predicted usage of the item over the life cycle of the end item and the practicality and economics of stocking, storing and issuing items. Typical M coded items include hose assemblies, tubing, name plates, decals, wires, etc. which have minimal likelihood of replacement during the life cycle of the end item.

All the publications, manufacturing data, required shop equipment and skills must be available at the specified level of maintenance.

MD Item to be manufactured or fabricated at depot maintenance level.

MF Item to be manufactured or fabricated at intermediate maintenance level.

Air Force - Intermediate(*) Marine Corps - 3rd Echelon

Army - Direct Support Navy - Afloat

MG Item to be manufactured or fabricated at both afloat and ashore intermediate maintenance levels - Navy use only.

MH Item to be manufactured or fabricated at intermediate maintenance level.

Air Force - Intermediate(*) Marine Corps - 4th Echelon

Army - General Support Navy - Ashore

ML Item is to be manufactured at a specialized repair facility (e.g., environmental considerations).

MO Item to be manufactured or fabricated at organizational level.

4. P SERIES SOURCE CODES. P series source coded items are items which are centrally procured.

PA Item is procured and stocked for anticipated or known usage. Items are normally considered for replenishment.

PB Item procured and stocked for insurance purposes because essentiality dictates that a quantity be available in the supply systems.

PC Item procured and stocked but is deteriorative in nature.

PD Support item, excluding support equipment, procured for initial issue or outfitting and stocked only for subsequent or additional initial issues or outfittings. Not subject to automatic replenishment.

PE End item and/or support equipment procured and stocked for initial issue or outfitting for specific maintenance repair activities.

UNIFORM SOURCE CODES (cont.)

Appendix A - 4 ATTACHMENT 9

PF Support equipment which will not be stocked but which will be centrally procured on demand.

PG Item is procured and stocked to provide for sustained support for the life of the equipment. It is applied to an item which, because of probable discontinuance or shutdown of production facilities would prove uneconomical to reproduce at a later time.

PH Item is procured and stocked and has been identified to contain hazardous material. Item requires recordation in the Hazardous Material Information System (HMIS) and a

Material Safety Data Sheet (MSDS).

PR End item and/or support item, terminal or obsolete and replaced. No longer authorized for procurement. On hand assets may be issued until exhausted. Then use replacement item.

PZ Item is terminal or obsolete with no replacement; discontinue use. (Army only. This code will not effect other services if they are recorded as a user at DLSC.)

5. X Series Source Codes. X series source coded items are items for which no demand is anticipated.

XA Item is not procured or stocked because the requirements for the item will result in the replacement of the next higher assembly.

XB Support item with low mortality rate, not procured or stocked. Item may/may not be available through salvage. Salvage should be considered unless use of salvage item is prohibited by instruction in equipment publication. If prohibited, requisition through normal supply channels using Commercial and Government Entity (CAGE) code and reference number.

XC Installation drawing, diagram, instruction sheet, field service drawing, that is identified by manufacturers’ part number.

XD Support item with low mortality rate, not stocked. Local purchase or requisition through normal channels using contractor and government entity code (CAGE) and reference number. Not obtainable from salvage/cannibalization.

Appendix A - 5 ATTACHMENT 9

TABLE II

MAINTENANCE CODES

GENERAL: Maintenance codes are assigned to indicate the levels of maintenance authorized to USE, REMOVE, REPLACE or REPAIR support items. The maintenance codes are entered in the third and fourth positions of the Uniform SMR Code Format as follows:

Use (third position): The maintenance code entered in the third position will indicate the lowest maintenance level authorized to remove, replace and use the support item. The decision to code the item for removal and replacement at the indicated maintenance level will require that all the capabilities necessary to install and insure proper operation after installation of a replacement item (i.e., pre-installation inspection, testing, and post-installation checkout) are provided. The maintenance code entered in the third position will indicate one of the following levels of maintenance.

CODE APPLICATION/EXPLANATION

D Support items that are removed, replaced, used at Depot only:

USAF - Depot, Mobile Depot and Specialized Repair Activity

USA - Depot, Mobile Depot and Specialized Repair Activity

USN - Aviation Rework, Avionics and Ordnance Facilities and

Shipyards

USMC - Depot

F Support item is removed, replaced, used at the following intermediate levels:

USAF - Intermediate (*)

USA - Direct Support (*)

USN - Afloat

USMC - Third Echelon

G Support item is removed, replaced, used at both afloat and ashore intermediate levels.

(Navy only)

H Support item is removed, replaced, used at the following intermediate levels:

USAF - Intermediate (*)

USA - General Support (*)

USN - Ashore (only)

USMC - Fourth Echelon

* NOTE: For USAF programs and the USA safeguard program, Code F will be used to denote intermediate maintenance. On joint programs, use of either Code F or H by the joining service will denote intermediate maintenance to USAF and the USA safeguard program.

K Repairable item. Item is removed, replaced or used at contractor facility.

L Item is removed, replaced or used at designated specialized repair activity.

MAINTENANCE CODES (cont.)

Appendix A - 6 ATTACHMENT 9

O Support item is removed, replaced, used at the organizational level of maintenance.

Note (1): To distinguish between the organizational maintenance capabilities on different classes of ships the following codes may be used intra-Navy only. On joint programs, Navy will receive and transmit an O to indicate organizational maintenance level.

2 - Minesweeper, Yardcraft, Patrol Boat

3 - Submarines

4 - Auxiliary / Amphibious Ships

5 - Minor Combatant (Destroyer, Frigate)

6 - Major Combatant (Cruiser, Carrier)

Note (2): On Army programs, a code “C” may be used in the third position to denote crew or operator maintenance performed within organizational maintenance. On joint programs, the Army will receive or transmit an O to indicate organization level.

Z Item is not authorized to be removed or replaced at any maintenance level. This code is assigned to items not required for support in a specific application and is identified for reference purposes only. (Navy use only.)

Appendix A - 7 ATTACHMENT 9

MAINTENANCE CODES

Repair (fourth position): The maintenance code entered in the fourth position indicates whether the item is to be repaired and identifies the lowest maintenance level with the capability to perform complete repair. The decision to code the support item for repair at the indicated maintenance levels requires that all maintenance capability (remove, replace, repair, assemble and test) for the support items be provided to that level. This does not preclude some minor repair which may be accomplished at a lower level of maintenance. However, because of service differences in communicating maintenance repair level information a maintenance code entry in this position is not required by all services. When a maintenance code is not used a dash (-) sign will be entered. For multi-service equipment / systems or when a code is entered, this position will contain one of the following maintenance codes as assigned by the service(s) that require the code:

B No repair is authorized. The item may be reconditioned by adjusting, lubricating, etc. at the user level. No parts or special tools are procured for the maintenance of this item.

D The lowest maintenance level capable of complete repair of the support item is the

Depot level.

USAF - Depot, Mobile Depot

USA - Depot, Mobile Depot

USN - Aviation Rework, Avionics and Ordnance Facilities and

Shipyards

USMC - Depot

F The lowest maintenance level capable of complete repair of the support item is the following intermediate level:

USAF - Intermediate (*)

USA - Direct Support (*)

USN - Afloat

USMC - Third Echelon

G Both afloat and ashore intermediate levels are capable of complete repair of support item. (Navy only)

H The lowest maintenance level capable of complete repair of the support item is the following intermediate level:

USAF - Intermediate (*)

USA - General Support (*)

USN - Ashore (only)

MAINTENANCE CODES (cont.)

Appendix A - 8 ATTACHMENT 9

K Repairable support item. Complete repair capability exists at a designated contractor facility.

L Repair should be performed at the designated Specialized Repair Activity.

O The lowest maintenance level capable of complete repair of the support item is the organizational level.

Note (1): To distinguish between the organizational maintenance capabilities on different classes of ships the following codes may be used intra-Navy only. On joint programs, Navy will receive and transmit an O to indicate organizational maintenance level.

2 - Minesweeper, Yardcraft, Patrol Boat

3 - Submarines

4 - Auxiliary / Amphibious Ships

5 - Minor Combatant (Destroyer, Frigate)

6 - Major Combatant (Cruiser, Carrier)

Z Non-repairable. No repair is authorized.

Appendix A - 9 ATTACHMENT 9

TABLE III

RECOVERABILITY CODES

GENERAL: Recoverability Codes are assigned to support items to indicate the disposition action on unserviceable items. The recoverability code is entered in the fifth position of the uniform SMR Code

Format as follows:

A Non-repairable. Item requires special handling or condemnation procedures because of specific reasons (i.e., precious metal content, high dollar value or critical material. Refer to appropriate manuals / directives for specific instructions.

D Repairable item. When beyond lower level repair capability, return to depot.

Condemnation and disposal not authorized below depot level.

F Repairable item. When uneconomically repairable, condemn and dispose at the following intermediate levels:

USAF - Intermediate (*)

USA - Direct Support (*)

USN - Intermediate Afloat

USMC - Third Echelon F

G Field level repairable item. When uneconomically repairable, condemn and dispose at either afloat or ashore intermediate levels. (Navy only)

H Repairable item. When uneconomically repairable, condemn and dispose at the following levels:

USAF - Intermediate (*)

USA - General Support (*)

USN - Intermediate Ashore

K Repairable item. Condemnation and disposal to be performed at contractor facility.

L Repairable item. Repair, condemnation and disposal not authorized below depot level.

O Repairable item. When uneconomically repairable, condemn and dispose at organizational level.

Z Non-repairable item. When item becomes unserviceable, condemn and dispose of at authorized level.

TABLE IV

Appendix A - 10 ATTACHMENT 9

SERVICE OPTION CODES

GENERAL: Service Option Codes are assigned to support items to convey specific information to the

Service’s logistics community / operating forces. Each service uses the code to disseminate specific instructions which add to that Service’s internal logistics practices. Service Option Codes are entered in the sixth position of the Uniform SMR Format as follows:

ARMY - Demilitarization Code used in accordance with DOD 4160.21-M-1. Identifies unique requirements to be considered when an item is condemned.

MLI - Denotes Military List Team

SLI - Denotes Strategic List Team

Code Application

A No demilitarization required.

B MLI, no demilitarization required.

C MLI, remove deadly parts in accordance with DOD 4160.21-M-1.

D MLI, mutilate.

E MLI, burn, shred or pulp.

F MLI, contact the item manager.

G MLI, demil prior to DRMO.

P MLI, security classified, DECLAS, demilitarize sensitive markings prior to transfer to DRMO. Not used on AEDA items.

Q SLI, mutilate to preclude normal use, OCONUS only.

AIR FORCE - Expendability Recoverability Reparability Category Code (ERRC). Provides management characteristics, funding and condemnation information.

C Recoverable, condemn at depot level. (SCARS)

N Throw away, condemn at maintenance use level.

P Recoverable, condemn at intermediate level.

S Support equipment, condemn at depot level. (AFEMS)

T Recoverable, Condemn at depot level. (AFRAMS)

U Support equipment, condemn at O/F level. (AFEMS)

Appendix A - 11 ATTACHMENT 9

NAVY - Service Option Code. Provides specific data to the maintenance community which cannot be conveyed in the Uniform SMR Coding Format.

1 Engine intermediate maintenance level - First Degree.

2 Engine intermediate maintenance level - Second Degree.

3 Engine intermediate maintenance level - Third Degree.

6 PA source coded item which is normally procured commercially but organic capability exists to manufacture (source code M series) for emergency stop gap requirements.

Organic sources should be reviewed when commercial sources cannot meet demand.

8 Indicates a inter-service depot non-consumable item that is, by the Navy maintenance plan, repairable by second degree engine maintenance level.

9 Indicates a inter-service depot non-consumable item that is, by the navy maintenance plan, repairable by third degree engine maintenance level.

E Items which are removed by the O level with no I level repair authorized; however, the I level must perform end to end test to verify failure prior to final disposition. (Beyond

Capability of Maintenance)

J Indicates and inter-service DLR, that is, by the Navy maintenance plan, considered completely repairable below the depot level.

P Indicates the item is under a progressive maintenance review. (Item will be coded O in the fourth position and D in the fifth position.) P (sixth position) will then indicate intermediate is authorized between O and D levels. In the unlikely event that two different service option codes apply to the same item, the “P” progressive maintenance code will take precedence.

R Indicates Gold Disc repair capability has been developed at the organizational and/or intermediate levels of maintenance. Repair must be performed in a certified Module

Test and Repair Facility (MTRF).

T PD source coded item which has peculiar application to training devices.

Appendix B - 1 ATTACHMENT 9

APPENDIX B

Technical Replacement Factors (TRFs)

During the provisioning process for a new system/equipment, each part within the system/equipment subject to replacement that was not identified to a National Stock Number (NSN) during screening shall be assigned a TRF by the contractor. The TRF is an engineering estimate derived from several sources, depending upon the characteristics of the item (electrical, mechanical, electronic). The TRF is used in the computation of stocking levels until the item has been in the supply system long enough to establish a demand or usage pattern. When demand data are applied, the TRF is updated.

1. Relationship of TRF to Failure Rate. Failure rate, as commonly used in discussing reliability or failure prediction of equipment and their repair parts, is the ratio of the number of part failures divided by the population of the part and the time period over which failures were observed. Failure rates are commonly expressed in terms of the number of failures per million hours of operation, although conversion can be made to any time base convenient for discussion.

The similarities between TRF and failure rate are readily apparent. They both represent a ratio of the number of occurrences of an event (failure or usage) to the population of the item in service during the time the event occurred. They both are used to predict the number of events expected to occur during some future time period for some known population in service during this future time period. They both are subject to bias due to faulty classification (e.g., an item was replaced even though it had not failed).

The TRF assigned to an item is not only a function of failure, but is also a function of maintenance philosophy, since it is the maintenance philosophy which determines what is to be replaced (demanded).

2. TRFs of Zero. There is a rationale for an item to have a TRF of zero. For example;

It is never demanded, because it never fails.

It is never demanded because when it fails it is not replaced since the individual parts within, which have caused it to fail, are replaced (i.e., the item is repaired).

In each of the above, the single condition which causes an item to have a TRF of zero is that it is never demanded. There is but one reason for an item to have a zero failure rate--it never fails.

3. Example of TRF Calculation. TRF is calculated by applying the appropriate data to the ratio from the testing to the ratio of item replacement times the hours per year divided by item population for the test times the hours of the test. This is represented by the following equation:

Replacements x Operating Hrs/Year

Test Population x Test Hrs

The TRF is an eight position numeric entry in Block C-34 (MRRI Block) of the LMI Provisioning Data

Product requirements format (See LMI Worksheet Attachment 1). The decimal point is assumed to fall between the fourth and fifth positions. The procedures for calculating the TRF of a table lamp are presented in this section. The lamp consists essentiality of 4 parts:

The light bulb - a consumable assembly

Appendix B - 2 ATTACHMENT 9

The combined socket and switch - a consumable assembly

The electric cord - a consumable item

The plug - a consumable item.

The assumption is made that the lamp is operated for 1,000 hours a year, or a little less than 3 hours a day, and that the functional parts of the lamp listed above have the following Mean Time Between Failures

(MTBFs) and failure rates:

Item MTBF Failure

Rate/Year

Light Bulb 750 HRS 1.333

Socket Switch 10,000 HRS 0.100

Electric Cord 15,000 HRS 0.066

Plug 10,000 HRS 0.100

By summing the failure rates of the parts of the lamp, the failure rate of the lamp itself can be derived.

Doing this, it is found that the lamp will fail 1.599 times per year, largely due to the light bulb failing

1.333 times per year, but the other parts will make some contribution to the failure rate of the lamp. The table above does indicate, however, that if the lamp is owned for a long period of time, say 10 or more years, failure of the socket/switch cord or plug is to be expected. Note at this point that even though the failure rates of the parts of the lamp have been determined, the TRFs of the parts or the lamp still cannot be determined. To do this, the maintenance philosophy for the lamp needs to be known. In this simplified case, the number of different maintenance philosophies available are few: the lamp may either be repaired when it fails, replaced when it fails, or a combination of the two. That is, the lamp might be repaired when it fails if the light bulb is the failed part, and replaced when any of the other parts have failed. Note that the TRFs to be assigned to the lamp and the parts are a function of which of the above is chosen. If the lamp is replaced any time it fails, the lamp is the replaced (demanded) part; therefore, it has a TRF, but none of the parts do. If the lamp is repaired by replacing the failed parts, each of these has a

TRF; the lamp does not. If the light bulb is replaced when it burns out, but the whole lamp is replaced when anything else fails, the lamp and the light bulb have TRFs, but the other parts do not. The maintenance philosophies and the resultant variable TRFs can be shown in a table thus:

Failure Replace Replace Failed

Rate Failed Replace Bulb, Otherwise

Item Per Year Part Lamp Replace Lamp

Lamp 1.599 TRF = 0 TRF = 1.599 TRF = 0.266

Bulb 1.333 TRF = 1.333 TRF = 0 TRF = 1.333

Socket/Switch 0.100 TRF = 0.100 TRF = 0 TRF = 0

Cord 0.066 TRF = 0.066 TRF = 0 TRF = 0

Plug 0.100 TRF - 0.100 TRF = 0 TRF = 0

Using the simplified example above, some parallels can be drawn between this example and the maintenance philosophies experienced in supporting shipboard equipment.

Appendix B - 3 ATTACHMENT 9

The first maintenance philosophy represents the "traditional" way a majority of equipment is supported today (i.e., repair in place using piece parts throughout the life of the equipment, with replacement of the end item only in the event of catastrophic failure or damage beyond repair).

The second philosophy represents the case of modular replacement with no repair at the organizational level. In the case of Navy equipment, the module, or in our example the lamp might be sent to a depot for repair and returned to the owner or to stock.

The third philosophy represents limited organizational maintenance with more difficult and time consuming repair deferred to a higher level.

The sample serves to illustrate that assignment of a TRF requires knowledge of failure rates for the parts concerned. TRF is also a function of the maintenance philosophy to be applied. That is, the determination must be made whether the item will be replaced (demanded) upon failure, for if an item will not be replaced (demanded) upon failure, its TRF must be zero. Since TRF equals demand divided by population, if demand is zero, TRF is also zero.

4. TRFs Assigned to Consumables. TRFs for low cost, common design consumables (resistors, capacitors, etc.) shall be taken from the Generic Item Name Technical Replacement Factor Guide.

(Provided as Government Furnished Information [GFI]). This data reflects observed supply demand for these items, including false replacements, requisitions for stores, tool boxes, losses, etc., in addition to actual failures. For high cost, unique design consumables peculiar to the end item (special purpose tools, power supplies, potted or encapsulated assemblies), use the following sources in descending order of preference:

a. Actual failure data from the manufacturer.

b. MIL-HANDBOOK-217 Reliability Prediction converted to TRF by multiplying failures per hour by yearly component operating hours, taking duty cycles and stress factors into consideration.

c. Observed data for similar items.

5. Repairable Item TRFs. TRFs for repairable items are first assigned a raw TRF as described in paragraph 4 above. The raw TRF is then derated by a derating factor described below.

a. Items Totally Repairable at the Organizational Level. Obtain the appropriate TRF as described in paragraph 4 and then apply a derating factor from .10 to .99 depending upon the ease of repair, cost of the item and availability of all components of the assembly at the organizational level. The resulting replacement factor will be the number of items per application per year which fail, are not repaired at the organizational level, and must be requisitioned from the storeroom.

b. Items Installed by the Intermediate Level and Totally Repairable at the Intermediate Level.

Obtain the appropriate TRF as described in paragraph 4 and then apply a derating factor from 10 to .99 depending upon the ease of repair, cost of the item and availability of all components of the assembly at the intermediate level. The resulting replacement factor will be the number of items per application per year which fail, are not repaired at the intermediate level, and must be requisitioned from the storeroom.

c. Items Partially Repairable at the Organizational Level and Totally Repairable at the

Intermediate Level. Obtain the appropriate TRF as described in paragraph 4. A derating factor from .10 to .99 will be assigned depending on the ease of repair, cost of item, and availability of all components of

Appendix B - 4 ATTACHMENT 9 the assembly at the organizational level. The resulting replacement factor will be the number of items per application per year which are neither repaired at the organizational level nor the intermediate level, and which must be replaced from system stocks.

d. Items Not Repairable at the Organizational or Intermediate Level and Partially or Completely

Repairable at the Depot Level. Enter the appropriate TRF as described in paragraph 4 to the organizational level. A derating factor of .99 will be assigned. The resulting factor indicates negligible demand on system stock.

Appendix C - 1 ATTACHMENT 9

APPENDIX C

Guidance For Assignment Of Part To Component ECs

The Military Essentiality Code (MEC) indicates the degree to which unavailability of a replacement for an installed item when needed to perform corrective maintenance affects the ability of the end item to perform its primary function in the intended manner. An end item is a final combination of end products, component parts, and/or materials which is ready for its intended use (e.g., radar set, fire control system, electrical generator). The need to perform corrective maintenance is normally the result of failure of an item and so essentiality is commonly evaluated in the context of item failure, but it must be remembered that some parts may be needed for replacement owing to their use when replacing other failed parts (e.g., gaskets).

I. CODE 1

A. LMI Data Product Dictionary #280 Definition: Failure of this item will render the end item inoperable.

B. Guidance on Assignment of:

1. Failure of this item in its normal failure modes will result in total and catastrophic failure of the end item or a critical function of the end item.

2. This item is a part which normally is not considered to fail but is required to be installed, along with an item whose failure will result in total and catastrophic failure of the end item (e.g., gaskets, seals; etc.).

3. This item monitors a critical function and a malfunction will disenable an operator's capability to recognize a catastrophic failure.

II. CODE 3

A. LMI Data Product Dictionary #280 Definition: Failure of this part will not render the end item inoperable.

1. Failure of this item in its normal failure modes will result in at most minor degradation of the end item.

Appendix C - 2 ATTACHMENT 9

III. CODE 5

A. LMI Data Product Dictionary #280 Definition: Item does not qualify for assignment of

Code 1 but is needed for personnel safety.

1. The Navy states that for MEC Code 5, the item may or may not qualify for assignment of Code 1; however, failure without immediate replacement or lack of this item will directly and immediately infringe on the safety of personnel operating or maintaining the equipment. This code should not be assigned to parts or assemblies which are installed in systems whose primary purpose is safety of ship/aircraft or personnel simply because of that system relationship unless the item separately meets the first part of this guidance.

2. If an item qualifies for MEC 5, it should be assigned MEC 5 regardless of what other

MEC it also qualifies for.

IV. CODE 7

A. LMI Data Product Dictionary #280 Definition: Item does not qualify for the assignment of

Code 1 but is needed to prevent impairment or the temporary reduction of operational effectiveness of the end item.

1. Failure of this item in any of its normal failure modes will not result in total and catastrophic failure of the end item but rather will result in only partial degradation of the end item allowing continued operation within acceptable performance ranges. Items should be classified as MEC 7 if their normal failure modes are gradual deterioration or wear and such gradual deterioration or wear is noticeable or detectable prior to its reaching maximum limits. Items should also be classified as MEC 7 if redundancy provides for continued operation after failure of one unit of an item but at reduced capacity or capability. If redundancy provides for continued operation after failure of one unit of an item at normal capacity or capability, assignment of MEC 3 is appropriate.

2. This assignment applies to all built-in test circuitry which is critical to the monitoring or fault isolation of the end item. The exception applies to those components which monitor critical functions in which a failure will hide a critical failure.

Appendix D - 1 ATTACHMENT 9

APPENDIX D

Reference Designation, Quantity per Assembly and Quantity per End Item

The purpose of the Reference Designation Example is to illustrate the relationships between the following data elements:

Reference Designation

Quantity per Assembly (QTY/ASSY)

Quantity per End Item (QTY/EI)

REFERENCE DESIGNATION STRUCTURE:

A reference designation provides configuration information linking a component to a location within an equipment. The preferred reference designation structure is the standard ANSI Y32.16 electronics format

(i.e., 1A2C-5). Other acceptable formats are the technical manual figure and index number (i.e., FIG-12

ITEM-38) or the engineering drawing and item number (i.e., DRAWING 39847-4 ITEM 25). The TSA can provide additional guidance regarding acceptable reference designation formats. The receiver appearing on the next page illustrates the relationship of an equipment (e.g., the receiver) to some of its component parts. The receiver and its subordinate components are all identified by a unique reference designation. Each additional level of indenture of breakdown adds additional characters to the Reference

Designation, moving from the receiver (Reference Designation "1") to the diode (Reference Designation

"1A2A6A15CR-4"). The following "family tree" for the diode describes these relationships:

REFERENCE QTY QTY PART

LINE ITEM DESIGNATION ASSY EI NUMBER

RECEIVER 1 1 1 01A2266000-21-11

RADIO-SUBASSY 1A2 1 1 01A2266062-21-11

DIODE 1A2CR-1 1 4 JAN IN649

XLATOR-SYN 1A2A6 1 1 99A226060-21-11

CIRCUIT CARD 1A2A6A15 1 2 01A226078-21-11

DIODE 1A2A6A15CR-4 2 REF JAN 1N649

(See Reference Designation Example on page D-2)

Appendix D - 2 ATTACHMENT 9

Appendix D - 3 ATTACHMENT 9

QTY/ASSY AND QTY/EI RELATIONSHIPS:

The sum of all QTY/ASSY values for a given part in the equipment must equal the QTY/EI of the part.

This may lead to a computational problem when an assembly is used several times in an equipment but its component parts are listed only once at the first appearance of the assembly.

To resolve the problem, the QTY/ASSY of each component is adjusted by multiplying the original

QTY/ASSY by the QTY/EI of the assembly. In the "receiver" example, the original QTY/ASSY of the

1A2A6A15CR-4 diode (i.e., "1") is multiplied by the QTY/EI of the 1A2A6A15 assembly (i.e., "2") and the resulting QTY/ASSY for the diode is "2."

An automated summation of the QTY/ASSY values for the diode, part number JAN IN649, now results in a correct QTY/EI value of "4."

REFERENCE DESIGNATION, QTY/ASSY AND QTY/EI RULES:

The following "rules" will help ensure that proper Reference Designations, Quantity per Assembly and

Quantity per End Item are provided in Provisioning Technical Documentation:

Dashes are required in the piece part field. This dash separates the alpha and numeric portion of the piece part identification.

Each Reference Designation must be unique.

Reference Designation structure must provide an auto- mated sort in top-down sequence.

Reference Designation must agree with technical manuals and drawings.

Quantity per End Item must indicate the total quantity within the "equipment".*

A summation of the Quantity per Assembly for a part within an "equipment"* must be equal to the QTY/EI for the part.

* The term "equipment" refers to any item being documented by a unique Provisioning Contract Control

Number (PCCN).

Appendix E - 1 ATTACHMENT 9

APPENDIX E

Indenture Coding

The purpose of the Indenture Coding Example is to illustrate the relationships between the following data elements:

Indenture Code

Quantity Per Assembly (QTY/ASSY)

Quantity per End Item (QTY/EI)

Part Numbers

INDENTURE CODING STRUCTURE

All PCCNs will have indenture codes assigned to each PLISN. PCCNs utilizing reference designators will have the reference designator as the sequencing method. PCCNs without reference designators assigned will utilize indenture codes for sequencing purposes. They are used to show a lateral and descending family tree relationship of each line item to and within the system or end item and its components (units), assemblies, subassemblies, and sub-subassemblies. Indenture codes are assigned as a one-character alphabetic symbol as follows:

*A*B*C*D*E*F

*A END ITEM

* *B Detailed parts of end item not contained in components of

* * installed system

* *B COMPONENT (UNIT)

* * *C Detailed parts of component (unit) which are not

* * * assemblies or subassemblies

* * *C ASSEMBLIES

* * * *D Detailed parts of assemblies which are not

* * * * subassemblies

* * * *D SUBASSEMBLIES

* * * * *E Detailed parts of subassemblies which are not

* * * * * sub-subassemblies

* * * * *E SUB-SUBASSEMBLIES

* * * * * *F Detailed parts of sub-subassemblies

Appendix E - 2 ATTACHMENT 9

Appendix E - 3 ATTACHMENT 9

The following "family tree" shows the indenture coding structure as depicted in the Indenture Coding

Example.

Note that the first listed bearing at indenture level "C" shows a QTY/ASSY of 1 and a QTY/EI of 2. For the second listed bearing, which has the same part number as the first listed bearing, the QTY/EI is REF to indicate that this line item has already appeared on the provisioning list.

Line Item Indenture Code QTY/ASSY QTY/EI Part Number

PUMP A 1 1 ABC

CASING B 1 1 DEF

ROTOR ASSY B 1 1 GHI

IMPELLER C 1 1 JKL

SHAFT C 1 1 MNO

BEARING C 1 2 PQR

BEARING C 1 REF PQR

Appendix F - 1 ATTACHMENT 9

APPENDIX F

CONTRACTOR FURNISHED EQUIPMENT (CFE) APL WORTHINESS RULES

This Appendix contains guidelines for New Construction, Overhaul/Availability and Small

Boats & Craft contracts for use in determining the need to submit PTD for the development of

APLs/AELs to support new CFE items. While these rules provide general guidance for determining if an item is non-APL worthy, any item which requires clarification of APL worthiness should be referred to the TSA for final determination. PTD submittal shall be required for all items determined to be APL worthy.

1. GENERAL APL WORTHINESS RULES: An item is considered APL worthy except when any of the following criteria applies:

a. The item is designed and manufactured with no replaceable parts.

b. The item has replaceable parts, but those parts will not wear or deteriorate under expected shipboard operation or storage conditions over the life of the item.

c. The item can be repaired or replaced when necessary by local fabrication from common materials.

d. The item has wide commercial, non-military application, and support is readily available on a local procurement basis (e.g., portable electric hand tools, office machines, kitchen appliances).

e. The item has a throwaway maintenance policy authorized by higher authority as a result of determination that complete replacement is more economical than supply system support of multiple repair parts.

If any of the above criteria apply, the item is considered non-APL worthy and will be added as a

Line Item (LI) to the Next Higher Assembly (NHA) APL or to the ship’s 89000 series APL.

2. ADDITIONAL HULL, MECHANICAL AND ELECTRICAL (HM&E) EQUIPMENT

GUIDANCE: The following HM&E equipment require special provisioning and/or allowance preparation procedures or will not have supply support provided. This list identifies only those items which have already been reviewed and defined. Additional items will be added to this list as they are identified.

ACCESS CLOSURES (Includes Doors, Hatches and Scuttles)

1. Watertight, airtight and power operated doors, hatches and scuttles.

a. PTD is required.

b. APLs will be developed.

c. COSAL support will be provided.

2. Doors, hatches and scuttles that are not watertight, airtight or power operated.

Appendix F - 2 ATTACHMENT 9

a. PTD is not required.

b. APLs will not be developed.

c. COSAL support will not be provided.

AIR MOTOR

1. No separate PTD is required for each procurement of this item.

2. Include as a line item of parent equipment PTD.

3. If not included in parent equipment PTD, include non-APL worthy Air

Motors on the SLPPL.

APPLIANCE, ELECTRICAL (Includes Egg Boilers (Cookers), Fruit Juice Extractors, Griddles, Emerson Heaters, Can Openers, Flat Irons, Fry Pans, Hand Held/Portable Food

Mixers, Waffle Irons, Microwave Ovens)

1. Includes electrical household/kitchen type appliances that are available commercially.

2. No PTD is required.

3. Parts are to be obtained by local purchase or replace entire item.

4. No COSAL support will be provided.

AUDIBLE SIGNAL (Includes Bells, Buzzers, horns, Sirens)

1. Apply APL worthiness rules. Separate PTD is required for each APL worthy Audible Signal.

2. Non-APL worthy Audible Signals All normally include those bells, buzzers, horns and sirens found in Military Standards and of Commercial Types which are so constructed as to make field repair neither expedient nor economical. Audible Signals with built-in power supplies or other such parts in addition to the basic signal will normally require separate PTD.

3. No separate PTD is required for each procurement of non-APL worthy

Audible Signals.

4. Include non-APL worthy Audible Signals in parent equipment PTD, if possible.

5. If not included in parent equipment PTD, include non-APL worthy

Audible Signals on the SLPPL.

CABLES, PUSH\PULL

1. Apply APL worthiness rules.

2. If not possible to include on parent equipment provisioning documentation, include on the SLPPL if maintenance significant.

CARTS AND DOLLIES - HAND OPERATED

1. No PTD is required.

Appendix F - 3 ATTACHMENT 9

2. Have replacement parts but frequency of repair is not sufficient to warrant APL development of system stock.

3. No COSAL support will be provided.

CIRCUIT BREAKERS

1. ACB circuit breakers are repairable and will have APLs built. These breakers range in frame size from ACB-640 to ACB-6400.

2. AQB-A250, AQB-LF250, NQB-A250, AQB-A400, AQB-LF400, NQB-

A400, AQB-A800, NQB-A800, AQB-A1600, and NQB-A1600 Molded case breakers are repairable and will have APLs built.

3. The small molded case breakers AQB-A50, NQB-A50, AQB-A100, AQB-LF100, AQB-A101, NQB-A101, ALB-1, and NLB-1 are not repairable.

These circuit breakers will be provisioned as line items on the NHA APL or

89000 series APL(s) as appropriate.

CLOCK, BATTERY POWERED

1. AEL Category.

2. No PTD is required with each separate procurement of these items.

3. Parts are to be obtained by local purchase or replace complete item.

COCK, DRAIN (Includes Plug Cocks, Pet Cocks)

1. No PTD is required with the separate procurement of this item.

2. The item should be listed as a line item on parent equipment PTD, if possible.

3. If not included on parent PTD, include on SLPPL if maintenance significant.

COFFEE MAKER

1. Non-APL worthy coffee makers include percolators up to 50 cup capacity.

2. Vacuum type coffee maker sets such as those described in Federal Specification

GC-C-531, or coffee urns will be supported as follows:

a. PTD is required.

b. APLs will be developed.

COILS, HEATING/COOLING, VENTILATION, DUCT TYPE/CONVECTION

1. A unit consisting solely of parallel tubes joined together by a header or headers, using fins to increase the surface area, installed within ventilation ducts.

2. No PTD is required.

3. No APL will be prepared.

4. There will be no COSAL support.

CONNECTOR, PLUG OR RECEPTACLE, ELECTRICAL

Appendix F - 4 ATTACHMENT 9

1. An electrical fitting with male, female, or male and female contacts constructed to be affixed to the end of a cable, conduit, coaxial line, cord, or wire for convenience in joining with another electrical connector(s).

2. Apply APL worthiness rules. PTD is required for each APL worthy connector and an APL will be developed.

3. Non-APL worthy connectors shall be included in PTD for parent equipment, if practicable. If not, include in the SLPPL if maintenance significant.

CONTROLLER, ELECTRICAL (Includes Starter Motors)

1. A device which, in addition to starting and stopping, performs one or more of the following functions; reverses, selects and/or regulates the speed of a motor.

Includes items operated with a rheostat or speed regulator.

2. PTD is required.

3. An APL will be developed.

4. HEATER, THERMAL RELEASE is not to be included on controller

PTD. Include heaters in the SLPPL to avoid a multiplicity of APLs for the same basic controller.

CUTTER, FABRIC, PORTABLE ELECTRIC

1. AEL category.

3. Parts are to be obtained by local purchase or replace complete item.

CYLINDER, PORTABLE GAS (Oxygen, Nitrogen, etc.)

DISPENSER - SOAP or SALT TABLET

1. GUCL item.

2. No PTD is required.

3. Parts may be obtained by local purchase or replace complete item.

DISPENSER - PAPER TOWEL

2. Parts may be obtained by local purchase or replace the complete item.

DRILL, PORTABLE

1. Includes all portable drills.

Appendix F - 5 ATTACHMENT 9

2. AEL category.

3. No separate PTD is required for each procurement of these items.

4. Parts are to be obtained by local purchase or replace complete item.

DUMBWAITER, HAND OPERATED (Includes Hand Powered Lifts)

2. Item has replacement parts but frequency of repairs is not sufficient to warrant

3. APL development or system stock.

EDUCTOR, AIR, or WATER POWERED

1. Commercial terminology for EJECTOR, AIR or WATER POWERED.

2. A device consisting of one or more jet ejectors designed to maintain a partial vacuum by the removal of air and other non-condensable gasses from a closed vessel.

3. No replacement parts required.

4. No PTD is required.

5. No COSAL support will be provided.

EDUCTOR, STEAM POWERED

1. Commercial terminology for EJECTOR, JET.

2. A device having pressure inlet(s), discharge outlet(s), and suction inlet(s) designed to move fluids or solids by utilizing the kinetic energy of fluid forced at a high velocity through a converging nozzle(s).

3. PTD is required.

4. APLs will be developed.

ELECTRICAL WARE (Includes Battery Boxes, Cable Clamps, Conduit Boxes, Connection Boxes, Jack Boxes, Junction Boxes, Pull Boxes, Switch Boxes, Terminal

Boxes, Non-APL Worthy Military or NEMA Standard Connectors, Stuffing Tubes, Terminal Boards, Wiring Troughs, Electric Wiring Appliances)

1. These are items of the standard variety found in military or NEMA standards and not expected to require replacement unless subjected to a catastrophic condition such as fire or explosion. These items are normally installed during the process of a shipboard electrical installation or modification, and otherwise are seldom required.

2. No PTD is required with each separate procurement of these items.

3. Each item shall be listed when required as a line item on PTD for a parent equipment when included in the bill of material for such equipment.

4. Individual APLs for electrical hardware will not be developed.

Appendix F - 6 ATTACHMENT 9

5. When not listed on parent PTD, include on the SLPPL if maintenance significant.

FRYER, DEEP FAT - See “HABITABILITY EQUIPMENT”.

FUSE

1. Fuses installed in specific parent equipment which require PTD are to be listed as line items on provisioning documentation for such equipment.

2. Fuses installed in general power and lighting distribution devices such as fuse boxes, etc., that are in the category of standard electrical shipboard hardware should be accumulated on ship-wide basis by shipbuilder provisioning activities for inclusion in the SLPPL. Such lists should completely identify the fuses and include the total shipboard installed quantity used in these general applications.

FUSE BOX

1. APLs are not developed for fuse boxes in order to avoid the preparation of thousands of fuse box APLs which would be required to display the various combinations and quantities of fuses that occur in these boxes.

2. PTD is not required for boxes considered to be in the category of standard shipboard hardware and for which fuses and fuse clips are the only items of maintenance or replacement significance.

GAUGE OR GAGE

1. Includes individual instruments with scale or dial for measuring or indicating quantity. Normally mounted in-line or on a parent equipment.

2. Include in PTD for parent equipment, if possible.

3. If not included in parent equipment PTD, include on the SLPPL. Does not include differential pressure indicators and indicating switches, to which APL-worthiness rules should be applied.

GRINDER, CRANKSHAFT, PORTABLE

3. Parts are to be obtained by local purchase or replace total component.

HABITABILITY EQUIPMENT (Includes…