(a) NAVSEA 0924-LP-062-0010 - Submarine Safety (SUBSAFE) Requirements Manual

(b) NAVSEAINST 4790.19 - Submarine Engineered Operating Cycle (SEOC) Program

(c) OPNAVINST 3120.33 - Submarine Extended Operating Cycle (SEOC) Program

(d) COMSUBLANT/COMSUBPAC NOTE C3120 - Submarine Operating Restrictions and Depth Authorization


A URO MRC Automated Work Request for Ship's Force Accomplishment

B URO MRC Automated Work Request for FMA Accomplishment

C SUBMEPP URO Inventory for Non-SSBN 726 Class Ship

D SUBMEPP URO Schedule for Non-SSBN 726 Class Ship

E SUBMEPP URO Inventory for SSBN 726 Class Ship

F SUBMEPP URO Schedule for SSBN 726 Class Ship

G Request for URO MRC Periodicity Extension Format

H Sample Work Package Supplement

8.1 PURPOSE. This chapter provides guidance and definition for the requirements, responsibilities and actions for continued submarine URO to design test depth. The URO program is invoked on all Submarine Safety (SUBSAFE) certified submarines.


8.2.1 Maintenance Requirements for Continued Unrestricted Operation to Design Test Depth. Reference (a) establishes the MRs and identifies the responsibilities and actions required to support continued unrestricted submarine operations to design test depth. In conjunction with reference (a), NAVSEA has issued individual manuals containing required, periodic SUBSAFE maintenance actions for each ship/class. The maintenance actions are written in 3-M MRC format. The MRCs in these publications will identify any degradation of the material condition of the hull integrity boundary and of those systems affecting ship's recoverability. The requirements set forth in these publications are, in addition, defect monitoring requirements, established on an individual ship basis, for submarines in which known uncorrected deficiencies exist. SUBSAFE certification indicates that a valid recommendation for URO to design test depth can be made. Maintenance of certification is dependent on both the positive control of all re-entries into the SUBSAFE boundaries per Volume V, Part II, Chapter 4 of this manual, the satisfactory and timely completion of applicable URO MRCs as required by reference (a) and any necessary repairs. Accomplishment of the MRs specified with this program will identify changes within the SUBSAFE boundary which result from inadvertent error and/or from degradation caused by the service environment.

8.2.2 Scheduling and Reporting. In order for the TYCOMs to carry out their responsibilities in the material certification of submarines and to aid in decisions concerning operational restrictions, an auditable system of scheduling the performance and reporting of URO MRCs has been developed. This system provides visibility to problem areas, facilitates verification and provides a permanent record of URO MRC accomplishment in the ship's 3-M machinery history maintained at the NAVSEA Logistics Center. Non-SSBN 726 Class Ships. SUBMEPP provided PMR inventories and schedules and the 3-M MJC Programs are used for scheduling and reporting. The scheduled URO requirements added to the CSMP from the MJC and the AWRs produced contain unique JCNs with WCs ending in "JC" (e.g., EAJC, EMJC, etc.). Appendices A and B of this chapter show a URO AWR for Ship's Force and FMA accomplishment respectively. Appendices C and D of this chapter show examples of the SUBMEPP URO inventories and schedules respectively, for a Non-SSBN 726 Class ship. SSBN 726 Class Ships. SUBMEPP provided URO MRC schedules and index and the Master Job File, as well as the Refit Work Planning System, are used for scheduling and reporting. The scheduled URO requirements added to the CSMP from the Master Job File and the AWRs produced contain unique JCNs with WCs ending in "JC" (e.g., EAJC, EMJC, etc.). Appendices A and B of this chapter show a URO AWR for Ship's Force and FMA accomplishment respectively. Appendices E and F of this chapter show examples of the SUBMEPP URO inventories and schedules respectively, for SSBN 726 Class ships. Submarine Maintenance Engineering, Planning and Procurement Activity Inventories, Indices and Schedules. The SUBMEPP inventories/indices and schedules are provided quarterly except when a ship enters a CNO Maintenance Availability, unless requested. Upon completion of the availability the quarterly issue will resume. The SUBMEPP schedules reflect all URO/MRC requirements becoming due within the next nine months except for short periodicity requirements (e.g. three months, four months, etc.). These will be listed only once. A description of the data elements used in the inventories/indices and schedules is provided with each issue.

8.2.3 Baseline and Due Dates. The baseline date for determining MRC due dates is the LMA date. Due dates for new requirements will be based on the Change Issue Date of the MRC invoking the new requirement. It is recognized that upkeep and docking schedules for ships which are well into the operating cycle may not permit full compliance with the scheduled due dates. In such cases, a Departure From Specification (DFS) for the MRC will be addressed on a case-by-case basis as specified in Volume V, Part II, Chapter 7 of this manual. LMA dates and URO due dates are determined as follows: Last Maintenance Action Date. For new construction ships, all URO MRCs have an initial LMA date established at delivery from new construction or from Post Shakedown Availability to start the operating cycle in accordance with the applicable URO MRC manual. During the operating period between commissioning and start of Post Shakedown Availability and during the operating cycle following Post Shakedown Availability, an adjusted LMA, as discussed below, is used for URO MRCs. Calculate the adjusted LMA date as follows:

a. If the PMR is accomplished during a period other than a scheduled CNO Maintenance Availability (e.g., voyage repair periods, at sea, port calls, FMA Availability, refit, upkeep, Restricted Availability, Technical Availability, etc.) the adjusted LMA date will be the first of the month following the PMRs completion date.

b. If the PMR is accomplished during a scheduled CNO Maintenance Availability (e.g., SRA, Extended Refit Period, Depot Modernization Period, Engineered Refueling Overhaul and other CNO Maintenance Availabilities, etc), the adjusted LMA date will be the first of the month following the scheduled availability's actual completion date.

NOTE: SQUADRONS OPERATING WITH THE ON-SITE PMR SCHEDULING SYSTEM MUST ENSURE THAT AVAILABILITY DATES ARE ACCURATELY MAINTAINED SO THAT COMPLETED AWR UPLINE REPORTED DATA (S5 RECORDS) REFLECTS THE ADJUSTED FMA DATE AND ON-SITE PMR SCHEDULING RECORDS CALCULATE THE PROPER NEXT DUE DATE. Calculating Due Dates. Next due dates are calculated based on an adjusted LMA date. Due dates are calculated, for scheduling purposes, by taking the adjusted LMA date month (number) and adding the periodicity months (number) to show the month due (i.e., an item with an adjusted LMA date of February 1995 (2/95) with a six month periodicity would be due in August 1995 (8/95). The PMR will be accomplished prior to midnight of the last calendar day of the month due.

8.2.4 Periodicity Extensions. When determining the due date for URO MRC inspections 001, 004, 005 and 034 (not all ships) for an individual submarine, time in overhaul or other periods when moored or otherwise inactive may be excluded from the time elapsed since the last inspection. Similarly, when determining the due date for URO MRC 002, 003 and 035, time in dry-dock may be excluded from the elapsed time. Extensions of periodicity from the next due date identified in the SUBMEPP PMR inventory for these MRCs are authorized by the TYCOM without further NAVSEA approval. However, they are not automatic and such requests shall be submitted by letter, in the format of Appendix G of this chapter, to SUBMEPP via the TYCOM. Upon receipt of TYCOM concurrence, SUBMEPP will reflect the periodicity extension and the revised due date in the next issue of the ship's PMR inventories and schedules.

8.2.5 Scheduling, Planning and Reporting Unrestricted Operation Accomplishment at Ship/Fleet Maintenance Activity Level. Scheduling. Separate scheduling systems are used for Non-SSBN 726 Class ships and SSBN 726 Class ships.

a. For ships assigned to ISICs using the TYCOM PMR Scheduling System, an Inventory and Scheduling Report is distributed with a computer scheduling tape by SUBMEPP to the applicable ISICs every three months. A copy of each report is to be provided to each applicable ship by the ISIC. The computer scheduling tape is entered with the MRMS MJC to create a CSMP deferral and AWR for each URO requirement which becomes due during the next nine months. ISICs using a local scheduling system will schedule the next two FMA Availabilities as a minimum. Those URO AWRs requiring work packages or other planning are forwarded to the FMA Planning Section. In the case of operational type UROs, the AWRs are sent to Ship's Force (LWC 991).

b. For ships assigned to Commander Submarine Squadron (COMSUBRON) 17, a CSMP deferral is created from the MJC/Master Job File and an AWR is provided for each URO requirement scheduled for accomplishment during the subject refit. In the case of operational type UROs, the AWRs are sent to Ship's Force (LWC 991).

c. With the exception of items that are unique to either scheduling system, all other requirements of this chapter apply to all submarine classes. Planning. FMA Planners will requisition materials, obtain plans and drawings, prepare Formal Work Procedures and/or Controlled Work Package and coordinate the scheduling with the Ship Superintendent, Production Officer and ISIC Material Office. Then the job will be turned over to the production WC for

accomplishment. For Ship's Force accomplishment of URO MRCs, the ISIC MDCO will provide the original and one copy of the AWR to the ship. The MDCO will adjust the scheduled start and completion date within the MRMS computer and maintain the subsequent MRMS repair WC 991 reports. Reporting to the Maintenance and Material Management System. Each URO AWR contains specific instructions on reporting the completed action and on use of a special feedback code to identify the material condition or that a change in inspection frequency is required. In order to ensure URO MRCs are correctly accomplished and reported to SUBMEPP, the following actions are to be taken prior to closeout of the AWR by ARRS:

a. Submarines completing URO AWRs are to fill-in block 102 with Action Taken Codes and suffix of A, B, or C for material condition assessment, if applicable, in block 103 and block 104. Sign for completion in block G, and have the Commanding Officer or Engineer Officer sign for acceptance in block H. Include a narrative statement in block 35,if required, and return the original AWR to the ISIC MDCO. The MDCO will review the AWR with the TYCOM Representative, close out the computer AWR and update SUBMEPP inventories and schedules. Note that because of the Auto-Close features, the completed AWR will automatically close the deferral in the CSMP.

b. FMA LWCs completing URO AWRs must ensure that all assist WCs have completed their work. The LWC then completes the AWR by filling in blocks 102 through 104, signing for completion in block G, and obtains acceptance signature from the ship's representative in block K. The AWR is then returned to ARRS. The ARRS will verify that all participating WCs have completed their assigned tasks and then pass the AWR to the ISIC MDCO for review and updating of SUBMEPP inventories and schedules prior to close-out of the AWR.

8.2.6 Unrestricted Operation Maintenance Requirement Card Accomplishment During Chief of Naval Operations Maintenance Availabilities.

a. The AWP prepared by SUBMEPP will reflect all URO MRCs authorized for accomplishment during the availability at the AWP SWLIN level. The WPS, accompanying the AWP, will identify a specific URO requirement to the applicable AWP SWLIN paragraph. Appendix H of this chapter provides an example of the WPS format.

b. Upon receipt of "Issue Two" of the AWP and WPS, ISIC MDCO will review the documents against the ship's CSMP and add those PMRs from the MJC to the availability (using the industrial activity's UIC as the Repair Activity UIC and a scheduled start and completion date corresponding to the availability's start and stop dates).

c. All Ship's Force originated deficiencies and all TYCOM Alteration Management System alterations screened for CNO Maintenance Availability accomplishment will be added to the same availability. In addition, the CNO Maintenance Availability baseline MJC SWLINs (JCN WC of EXSY) will be retrieved from the MJC and added to the availability.

d. URO PMRs accomplished by an industrial activity during CNO Maintenance Availabilities will be reported by the industrial activity as a function of the SMPC as established by reference (b). The WPS, annotated by the SMPC to show URO PMR completions and material condition feedback categories, will be returned to SUBMEPP and parent ISIC upon completion of the availability. Pending development by SUBMEPP of a CSMP and PMR Auto-Close feed back tape, the ISIC

MDCO will update the ship's CSMP and PMR Inventories and Schedules. Reporting of PMR completion dates in MRMS PMR will automatically reflect adjusted LMA dates on the completed AWR records reported upline.


8.2.7 Unrestricted Operation Maintenance Requirement Card Completion Reporting.

a. Within 30 days after the completion of an availability the activity accomplishing the MRC is required to provide a report of accomplishment to NAVSEA (PMS 390T) (or other technical code as designated in the MRC), SUBMEPP, and the ship's parent ISIC. Specific information to be included in the report is identified in the applicable MRC. The accomplishing activity shall retain a legible copy of the most current, and the previous inspection report (if accomplished by the same activity), until the ship is disposed of or stricken from the Naval Register. Legible Date Report Forms shall be included when required. Only the most current report/Data Report Form/legible signed AWR shall be retained for MRCs 016, 019, 022, 025, 026, and 029.

b. Prior to Fast Cruise for CNO Maintenance Availabilities, the industrial activity is required to provide the ship and ISIC with a letter of certification (including final inspection categories A, B, or C when applicable) that certifies all required inspections have been satisfactorily completed. For items which must be accomplished in dry-dock, the industrial activity is required to provide such certification prior to undocking.

c. Upon identifying a material condition that would result in a reduced inspection periodicity if not restored to Category A condition during the availability in which the condition was found, a special report is required to be submitted by the accomplishing activity in accordance with the applicable URO MRC and, if applicable, the AWP. This special report shall be provided immediately to NAVSEA (PMS 390T), TYCOM, ISIC, and SUBMEPP indicating:

(1) Applicable MRC.

(2) Equipment component identification.

(3) Inspection category.

(4) The reduced or deferred periodicity of each equipment component that should be inspected at less than its normal periodicity. This reduced periodicity report requirement is in addition to the completion reporting requirements of paragraphs 8.2.7.a and b above.

8.2.8 Operating Cycle/Interval Extensions. An Audit Plan to assess the material condition of ships prior to extending their operating cycle/intervals beyond URO MRC periodicities due to changing CNO Maintenance Availability dates or operational schedules, is addressed in reference (c). Additional guidance and responsibilities are contained in Volume II, Chapter 3 of this manual.


8.3.1 Submarine Maintenance Engineering, Planning and Procurement Activity.

a. Receive reports of completion of URO MRCs from all completing activities.

b. Review completion reports for compliance with the scheduled periodicity requirements and any change in the status category.

c. Establish an LMA date per paragraph of this chapter.

d. Revise the periodicity and next due dates in ship URO inventories/indices and schedules to reflect any NAVSEA approved periodicity change, requested periodicity changes for URO MRCs 001 through 005, 034 (not all ships) and 035 as allowed for in paragraph 8.2.4 of this chapter and NAVSEA approval of Major DFSs for extending URO MRC requirements.

e. Notify the TYCOM via the on-site SUBMEPP Representative of any URO beyond periodicity for TYCOM resolution.

f. Provide updated:

(1) URO Inventories/indices, schedules/reports and scheduling tapes to the ISIC quarterly.

(2) URO Inventories/indices and schedules/reports to the TYCOM SUBMEPP Representatives quarterly.

(3) For SSBN 726 Class ships, provide Refit Work Package tapes which reflect URO scheduling to the TRIREFFAC at the arrival minus 45 day milestone.

g. Provide MJC update tapes and a hard copy print out of the MJC which reflects URO MRC changes to the TYCOM at least semiannually.

8.3.2 Type Commander.

a. Perform periodic audits of the ISICs and FMAs to verify full compliance with the provisions of reference (a), Volume V, Part II, Chapter 8 of this manual and this chapter.

b. Provide guidance to the ISICs, obtaining NAVSEA concurrence as necessary, when deviations in the scheduling or accomplishment of maintenance or repairs are required by a DFS request and resolution per Volume V, Part II, Chapter 7 of this manual.

c. Review SUBMEPP provided MJC update tapes and provide copies to the FMAs via parent ISIC for update of the FMA MJC database.

8.3.3 Immediate Superior In Command.

a. Maintain auditable records of URO accomplishment for each submarine. These records will include the current SUBMEPP Quarterly Inventories/Indices and schedules/reports, completed AWRs for URO MRCs completed, data report forms/reports submitted as a result of last accomplishment and all approved DFS.

b. Conduct periodic audits of assigned FMAs and units to verify full compliance with the provisions of reference (a), Volume V, Part II, Chapter 8 of this manual and this chapter.

c. In addition to the records of audits, maintain the following:

(1) The PMR Special Report extracted from the previous end of the month CSMP file as described in the MRMS section of this Manual and provided by MDCO.

(2) A file, by ship, of the current URO Inventories/Indices and schedules as provided by SUBMEPP. The schedules (Appendix D of this chapter) for each ship shall be annotated with the JSN, the date of the URO MRC completion, the new adjusted LMA date and the next due dates for the completions and any periodicity extensions authorized.

d. Although the responsibility for the accomplishment of URO MRCs must rest with the ship's Commanding Officer, the nature and scope of the URO MRCs dictate that the ISIC coordinate the accomplishment of URO MRCs in accordance with the SUBMEPP provided PMR schedules and inventories. Accordingly, the ISIC shall assist in the preparation of, and approve each submarine's URO MRC performance schedule. In addition, the ISIC shall:

(1) Unless previously notified by SUBMEPP of delays, notify the SUBMEPP Representative at TYCOM of the non-receipt of schedules and reports.

(2) Upon receipt from SUBMEPP, review each ship's quarterly URO inventory/indices and schedule against the schedule information on the individual URO MRC to verify URO scheduling/periodicity is accurate and that any rescheduling data which has been submitted to SUBMEPP has been accurately incorporated. PMRs accomplished during the month preceding the quarterly report may or may not be reflected in the issue received. Similarly, upon receipt of URO MRC changes, audit the individual URO MRC procedural and schedule information against each ship's PMR inventory and schedule to verify that the component/equipment and periodicity has not changed and that provided changes do not impact current schedules. Resolve identified deficiencies through the SUBMEPP Representative at TYCOM.

(3) Review the enclosures to the PMR procedural inventories and the schedule forwarding letter and advise SUBMEPP of the completion dates of JSNs for URO MRCs listed. Forward copies of completed Data Report Forms for these and any other URO MRC completions identified by SUBMEPP as having missing Data Report Forms.

e. Control input of the SUBMEPP scheduling tape (M79EII/M79EH1), or equivalent, to the MJC retrieval and resultant update of the CSMP, which will produce the MRMS products for job completion. Ensure the tape is run as soon as feasible and correctly reflects all URO MRCs due for accomplishment within the next nine months.

f. Ensure that all URO requirements with the appropriate screening (Ship's Force, FMA, industrial activity) are in the CSMP for subsequent development by SUBMEPP of forthcoming CNO Maintenance Availability AWPs.

g. In the event that deviations from required periodicities or full requirements of the URO MRCs are required, request approval from the TYCOM by submitting a DFS request in accordance with Volume V, Part II, Chapter 7 of this manual. Such DFS requests will be a Major DFS for URO program deviations. DFS requests are also to be submitted when repairs arising from the MRC inspections cannot be completely accomplished. Periodicity extension requests for URO MRC 001, 002, 003, 004, 005, 034 (not all ships) and 035 shall be submitted in accordance with paragraph 8.2.4 of this chapter, and a file maintained that documents dry-dock and/or inactive time (as applicable) used as a basis for the request.

h. Establish procedures to affect routing of completed AWRs from the FMA ARRS or from the submarine (LWC 991) through the ISIC Material Officer for all URO transactions. The ISIC should ensure proper documentation has been completed as described in the special reporting procedures of the AWR. This must include the material condition feedback code as part of the final action. A rejection series code (6A-6I) should not be accepted unless the FMA Repair Officer cannot accomplish the URO at that site. Delays in accomplishment are to be reported as status changes so that the job remains in the production system and is visible as a "to-be-done" requirement. If the URO requirement cannot be accomplished at the site, the ISIC must ensure update (re-screening) of the CSMP concurrently with DFS notification. Each processed AWR is to be validated with the PMR Special Report described in the MRMS section of Volume II, Chapter 2 of this manual and, if satisfactory, passed to the Automated Data Processing Center for computer input. Upon receipt of the report of maintenance action accomplishment from an assigned unit or the FMA, review the report for completeness, consistency, acceptability of conditions and material trends. Where unsatisfactory conditions are found, direct repairs. Where repairs cannot be made, submit a DFS in accordance with Volume V, Part II, Chapter 7 of this manual. Ensure SUBMEPP inventories and schedules are updated in accordance with paragraph 8.2.5 of this chapter. Clear URO major DFS upon TYCOM or NAVSEA approval and receipt of the SUBMEPP Quarterly PMR Inventories/Indices and Schedules that accurately reflect the new due date of the URO MRC as stated in the approved DFS.


i. Upon identifying a material condition that would result in a reduced inspection periodicity, ensure the accomplishing activity reports the condition found via priority message to NAVSEA (PMS 390T), the TYCOM and SUBMEPP in accordance with paragraph 8.2.7.c of this chapter.

j. Monitor the timely submission of URO MRC data report forms and the report of accomplishment for UROs completed by the FMA and Ship's Force to ensure required documentation is submitted in accordance with paragraph 8.2.7 of this chapter. Ensure data report forms are submitted to report component replacement/repair/operation out of specification. The report of minor adjustments is not required. Minor adjustments include those needed to make the subject component operate in a specified manner or within specified time. For example, URO-25 requires a data report form be submitted for valves that do not meet specified operating times. If minor adjustments bring the valve into specification, submission of a data report form is not required.

k. Prior to a ship's underway period, review the ship's certification continuity report, if submitted, to ensure the ISIC and ship's records (including the CSMP) accurately reflect URO MRC status.

l. The Parent ISIC of deploying ships will:

(1) Ensure that any URO due for accomplishment by the ship during its deployment period is identified in the CSMP transfer tape and that the ship possesses the AWRs and MRC data report forms (if applicable) for reporting job completion.

(2) Provide a message to the applicable deployed FMA/Squadron identifying any URO expected to be accomplished by the deployed FMA and the status of required materials for each submarine deploying to cover the period of the deployment.

m. Deployed Squadrons will review the URO status of deployed submarines upon in-chop. Perform the function of the Parent ISIC in ensuring all URO MRCs are accomplished and reported within the required periodicity while the submarine is deployed.


8.3.4 Submarine Commanding Officer.

a. Ensure all URO MRCs are accomplished within the required periodicity as specified by reference (a), Volume V, Part II, Chapter 4 of this manual and this chapter.

b. Maintain auditable records of the accomplishment of URO MRCs to permit verification of compliance with reference (a), Volume V, Part II, Chapter 10 of this manual and this chapter. These records shall consist of:

(1) A copy of the TYCOM and NAVSEA SUBSAFE Material Certification message from new construction, Depot Modernization Period or overhaul until the ship's current status is reflected in reference (d). When the ship's current status is reflected in reference (d) the messages may be destroyed and the current notice will be retained.

(2) Copies of letter of completion for all URO MRC work accomplishment by other activities.

(3) Copies of letters of completion and inspection reports for work accomplished by Ship's Force. The required report forms are located at the end of the individual URO MRCS. For MRC 016, 019, 022, 025, 026 and 029, however, letters of completion/reports or legible signed AWRs shall be maintained. A copy of each completed report or AWR shall be submitted to the ISIC Material Officer as soon as practicable.

(4) One copy each of the current Quarterly URO Inventory Report (Appendix C of this chapter) and the latest scheduling report (Appendix D of this chapter) provided by SUBMEPP via the ISIC. Annotate the URO Inventory Report when accepting completed work requests from the FMA or Ship's Force (LWC 991). It is the ship's responsibility for ensuring that the reports reflect the actual configuration, especially with regards to the equipment identity and the Allowance Parts List.

(5) The original and one copy each of outstanding URO AWRs to be accomplished by Ship's Force as identified in the narrative and by assignment of LWC 991.

(6) One copy of each AWR for each WC whose last two characters are "JC" (e.g., EAJC, EMJC, etc.) as applicable).

(7) One copy of each authorization to deviate from the requirements of reference (a), Volume V, Part II, Chapter 7 of this manual and this chapter. This authority is based on the following factors and considerations:

(a) The completion of all URO MRCs, or portions thereof, will be reported on AWRs provided by the ISIC in accordance with paragraph of this chapter. Particular care must be exercised to ensure that existing conditions found at the time of inspection and/or need for repair or replacement of components is recorded in detail as prescribed by the MRC.

(b) Deviations from URO MRC requirements or periodicities may result in operational restrictions being placed on a unit. In order to determine whether such restrictions are necessary, the TYCOM must be fully apprised of the number and extent of deviations involved.

(c) Allow no deviations in the scheduling or accomplishment of required URO maintenance actions unless formal TYCOM approval of such deviations has been granted by an approved DFS or as allowed in paragraph 8.2.4 of this chapter. All system disassembles, repairs, and reassemblies must be conducted in accordance with Volume V of this manual, including requests for a DFS, if necessary.

(d) Except in an emergency, refrain from submerged operations if all required URO maintenance actions have not been completed within the specified periodicities unless formal authorization to deviate from these requirements has been granted by the TYCOM. NAVSEA recommendation and TYCOM authority to conduct URO to design test depth are contingent upon the satisfactory completion of these maintenance actions.



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From: Commander, Submarine Squadron

To: Commanding Officer, Submarine Maintenance Engineering, Planning and Procurement (SUBMEPP) Activity

Via: Commander Submarine Force, (Atlantic/Pacific Fleet)


USS (Ship's Name and Hull No.)

Ref: (a) Applicable URO MRC

(b) CINCLANTFLT/CINCPACFLTINST 4790.3; Joint Fleet Maintenance Manual, Volume IV, Part III, Chapter 8

(c) COMSUB(LANT/PAC) ltr 4790 Ser of (previous letter granting extension of periodicity)

1.In accordance with references (a) and (b), request extension of URO MRC periodicity for USS (Ship's Name and Hull No.) to coincide with SRA/Overhaul/Depot Modernization Period/Interim Dry-Docking as follows:


Equipment Guide List Item Number

LMA Date

Inactive Days/Days in Dock

Extension Required

Required Next Due Date



June 82

300 days (inactive)

7 months

Nov 91



June 82

100 days (Dry-Dock)

3 months

Nov 91



June 82

100 days (Dry-Dock)

3 months

Nov 91


INT Welds

June 84

300 days (inactive)

7 months

Nov 91


INT Welds

June 84

300 days (inactive)

7 months

Nov 91



Dec 87

300 days (inactive)

7 months

Nov 91



June 84

100 days (Dry-Dock)

3 months

Nov 91

2.Inactive days/days in dry-dock identified for the URO MRCs listed in paragraph 1 above is the actual elapsed time accrued to date since URO MRC was last accomplished/previous extension of periodicity was granted by reference (c).

Copy to:


Commanding Officer, USS (Ship's Name and Hull No.)

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