Gunnery Officer



Information Sheet Number: 1.5


This lesson gives a brief description of maintenance organizations and the services they provide. At first, this information may seem overwhelming, but the objective is to introduce a prospective Gunnery Officer to the terminology used when the ship is preparing for a maintenance availability. The Gunnery Officer will be expected to play an integral part in maintenance preparations due to the tremendous planning required for extended availabilities.






1. The maintenance policy of Commander Naval Forces in both the Atlantic and Pacific Fleets is to maintain all ships in a state of material readiness that will assure the highest possible degree of operational readiness for all contingencies.

2. In order to effect this policy, three distinct levels of maintenance have been established:

a. Organizational level maintenance

(1) That maintenance level which is the responsibility of and performed by ship's force personnel on assigned equipment.

(2) The Planned Maintenance System (PMS) defines the minimum preventive maintenance program to be carried out aboard the individual ship.

b. Intermediate level Maintenance Activity (IMA)

(1) IMA level is that maintenance which is normally performed by navy personnel on repair ships, aircraft carriers, fleet support bases and Shore Intermediate Maintenance Activities (SIMA's).

(2) The role of repair ships is two fold:

(a) They are a deployable maintenance asset for all contingencies.

(b) They are valuable assets under peace time conditions.

c. Depot level maintenance (shipboard).

(1) Depot level maintenance is that maintenance performed by industrial activities on material requiring major overhaul or a complete rebuilding of parts, assemblies, sub-assemblies and end items.

(2) Normally accomplished on ships at commercial facilities or naval shipyards. This includes ship repair facilities during restricted availabilities and regular overhauls.


1. Regular Intermediate Maintenance Activity Availability (IMAV)

a. In between regular overhauls, ships are assigned IMAV with the primary objective being the accomplishment of the maximum amount of maintenance, repair and overhaul of the ship. IMAV depend on workload, available funds and the relative operational and military need of various jobs.

b. Scheduling:

(1) Four weeks of uninterrupted availability every six months.

(2) Pre-deployment alongside - four week availability prior to an extended deployment. The Pre-Overseas Movement (POM) availability will normally terminate 7-14 days prior to deployment.

(3) Post deployment - four week availability three weeks after return from an extended deployment period.

(4) Pre-overhaul- four week availability prior to the start of regular overhaul.

(5) Inspection and Survey (INSURV) - two weeks prior to and two weeks immediately after an INSURV inspection.

(6) Supplemental - scheduled concurrently with the ship's regular availability for completion of specific type work beyond the capability of the IMA assigned the regular availability.


2. Concurrent IMA availabilities

a. A concurrent IMA availability is assigned, normally with a regular overhaul, for the accomplishment of ship-to-shop items during overhaul.

3. Continuous IMA Availability

a. The Regional Support Group provides continuous assistance for work beyond the capability of ship's force. Most will be deferred until the next regularly scheduled availability with the following exceptions:

(1) Items affecting safety or personnel.

(2) Items impairing ships operations. (Active CASREPs; C-3 and C-4 CASREPs will have priority)

4. Restricted Availability (RAV)

a. A Restricted Availability is assigned for the accomplishment of specific items of work, during which period the ship is rendered incapable of fully performing her assigned mission due to the nature of the work.

(1) Major emergency repairs such as major equipment casualty or damage to the ship (grounding, collision, fire).

(2) Correction or improvement of material status of a ship prior to an extended deployment.

5. Selected Restricted Availabilities (SRA)

a. SRA's are an integral part of the Engineered Operating Cycle (EOC) maintenance strategies.

b. The objectives of SRA's are:

(1) Completion of all authorized depot level work within the specified time constraints.

(2) No reduced performance (CASREPs) resulting from repairs and alterations accomplished during the availability.

(3) Satisfactory equipment test completions following repairs


c. Responsibilities:


(1) TYCOM reviews Current Ships Maintenance Package (CSMP) and develops an Authorized Alteration Package

(2) NAVSEASYSCOM updates the Ship's Alteration Repair Package (SARP)

(3) The ship conducts a Self-Assessment and identifies recommended SRA jobs

(4) The ship develops work requests (2K's) for recommended items

(5) Work Definition Conference and Bid Specification review are held to assign job responsibility

6. Technical Availabilities (TAV)

a. A Technical Availability is scheduled for accomplishment of specific items of work by a repair activity, during which period the ship's ability to perform her assigned mission is not affected by the nature of the work.

b. Technical Availabilities will generally be assigned to a repair activity in the vicinity with the capability to effect the required repair.

7. Overseas availability

a. Overseas availabilities are assigned for repairs requiring industrial assistance from repair facilities remote from those normally used by naval surface ships and which are essential for continuing the ship's assignment in a high state of readiness.



1. Ships in the U.S. Navy shall undergo regular overhauls at the intervals and durations set forth in OPNAVINST 4700.7 in order to accomplish major maintenance, modernization and conversion.

2. There are basically three distinct types of overhauls applicable to surface ships:

a. PERA (Planning and Engineering for Repairs and Alterations) Planned Regular Overhaul (ROH)

(1) Uses Pre-Overhaul Test and Inspection techniques (POT & I).

(2) Uses Ship Alteration and Repair Package (SARP) or Integrated Work Package (IWP) as the overhaul work package.

b. Non-PERA Planned ROH

(1) Uses ship's force to define work to be done (OPNAV 4790/2K).

c. PERA-planned Complex overhaul

(1) Designated when required by the scope and size of the industrial effort.

(2) All nuclear ships fall into this category.


1. Goals: The CSRR is a comprehensive system testing program developed to help ship's force in achieving a high state of combat systems readiness for deployment. Implicit in this goal are the following objectives:

a. To assess the readiness of the ship's combat systems material and personnel and report the status to appropriate seniors.

b. To help ship's force and ISICs in correcting material problems.

c. To provide on-the-job training for ship's force personnel and to improve self-sufficiency.

2. The CSRR is normally conducted by Fleet Technical Support Centers (FTSC). Occassionally, upon request of the ship, representatives from the ship's ISIC will also be involved.

3. Scheduling:

a. The CSRR is normally no earlier than 140 days prior to deployment.

b. Normally requires a minimum of ten working days to complete. Can be as long as four weeks total in length.

c. Broken into two phases:

(1) Phase 1 - Usually a week or two in length. The focus of this phase is to assess the condition and status of the entire Combat Systems Department to include material and personnel readiness.

(2) Phase 2 - Usually a week or two in length. The focus of this phase is to provide on-the-job training (OJT) and assist ship's force in repairing any piece of equipment that was found to be defective during Phase 1 and could not be repaired by ship's force alone.

d. Request for scheduling a CSRR will be submitted by the ship to the TYCOM via the ISIC.


4. Briefings and reports.

a. A briefing given by the CSRR Liaison Officer and local Fleet Technical Support Center (FTSC) representative is provided prior to the CSRR. It is intended to provide an overview of the program and resolve any questions or problems.

b. Progress briefings to the ship or ISIC are available at any frequency desired (daily, weekly etc...).

c. A final critique will be presented to the Commanding Officer with a detailed written report of all work accomplished during the CSRR.

d. A message report will be sent by the CSRR team to the TYCOM via the ISIC with informational cpoies being sent to the ship's local REGSUPPGRU, FTSC identifying:

(1) Significant discrepancies remaining

(2) Action being taken

(3) Major explosive safety or magazine sprinkler discrepancies.

(4) Tests not completed

(5) PMS feedback action to be taken by the ship

5. Auxiliary Systems Readiness Review (ASRR)

a. Done on or about the same time as the CSRR, looks at the air conditioning/refrigeration, LP air, electrical, elevators, and any system that can be used to support any of the combat systems equipment.


1. Ordnance Handling Safety Assistance Team (OHSAT)

a. Primary purpose is to serve as a means for monitoring/auditing all aspects of conventional weapons handling safety. OHSAT will also assist ships during preparations for the Shipboard Explosives Safety Inspection (SESI) which is required every 24 months. OHSAT can also be used for the following:

(1) Review of the Qualification and Certification program.

(2) Assessment of ordnance stowage spaces and handling


b. An OHSAT visit is usually a day or two in length, depending on ship size.

The OHSAT is comprised of LDO's with prior ordnance experience. Visits place strong emphasis on safety practices and material, ammunition/explosives safety.

c. Procedures for requesting an OHSAT visit

(1) The Combat Systems Officer or Gunnery Officer can request an OHSAT visit by calling the local OHSAT. Requests should be made 90 to 120 days in advance as OHSAT visits are usually in high demand.

(2) After confirmation of a mutually convenient time, the ship sends a GENADMIN message to the OHSAT requesting the dates in writing. (OHSATs are a part of either the Afloat Training Group (ATG) LANT or PAC)

d. Reports upon completion of the visit

(1) Team Leader will conduct a critique with all wardroom members either directly involved or concerned.

(2) The report generated by the OHSAT remains with the ship's Commanding Officer and Combat Systems Officer. The OHSAT does not submit their report to the ship's ISIC or TYCOM. Occassionally though, representatives from the ship's ISIC will be present during the OHSAT visit.

e. Miscellaneous information

(1) OHSAT is a good deal for CSO's and Gunnery Officers. OHSAT has

an extremely high success rate amongst those ships that had visits prior to their FEP (Final Evaluation Period) or SESI.


1. The mission of FTSC is to assist ships in maintaining all shipboard systems in the highest state of material readiness. FTSCs are comprised of highly skilled military and civilian technicians. Most major homeports have a FTSC with representatives for most major weapons and engineering systems found aboard ships.

2. Provide responsive technical assistance beyond the facilities of an IMA.



3. When and where possible, assist in troubleshooting and effect repairs not requiring the facilities of an IMA.

4. Direct liaison between ship's personnel and FTSC is strongly recommended.

5. Some services provided by FTSC are:

a. Tech assist and training on electronic and ordnance equipment and systems.

b. Inspection and certification of magazine sprinkler automatic operation systems. (PRP operation)

c. Training of personnel in maintenance, upkeep, and testing of magazine sprinkler systems.



1. RSG is the local TYCOM representative.

2. RSG works closely with the local SIMA and will screen all ship work requests intended for SIMA. RSG must approve most jobs before the SIMA can begin work.



1. These IMA's are comprised of Navy personnel to directly support and provide assistance to fleet activities.

2. Normal IMAVs will be scheduled with one of these activities.

3. They have repair and test equipment not normally available aboard ships.

4. Functions:

a. Calibration

b. Repair or replacement of damaged parts

c. Emergency manufacture of damaged parts

d. Provide limited tech assist



1. Held in conjunction with ROH.

2. All spare parts are removed from the ship, inventoried, and checked for condition.

3. COSAL is updated and spare parts furnished as required.

4. ILO team will come aboard ship approximately 30 days prior to scheduled overhaul.

5. Each cognizant division will be required to provide personnel to assist the ILO team.

a. Choose a knowledgeable person who will be with the ship throughout the overhaul.

6. Details concerning the ILO is in OPNAVINST 4400.10.


























































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