During an overhaul period, work that pertains to the repairing, docking, and altering of the ship is done by the shipyard work force. At the same time, however, shipboard equipment is still maintained by ship's force personnel. Although most shipboard equipment is shut

down and not in use during an ROH, it still must be kept in the best possible condition of readiness. This is accomplished through the use of Inactive Equipment Maintenance (IEM). At the same time, the shipboard PMS package is going through a constant updating process. The flow of PMS documentation involved during an ROH period is shown in figure 12-1. The Integrated Logistics Overhaul (ILO) concept was developed because of logistic support problems existing in the Supply Operations Assistance Program (SOAP). The ILO program provides more comprehensive PMS documentation and supply support for shipboard equipment, including equipment that may not be affected during an overhaul. NAVSEA is responsible for the development and implementation of the use of the ILO program. Information about ILO-governed PMS procedures is contained in COMNAVSEASYS-COM Policy and Procedures Manual, Volume 4, (PMS Policy and Procedures for ILO), SL105-AA-PRO040/IL0.

As you can see, the PMS documentation process for an overhaul period starts long before the overhaul actually begins and proceeds through the ROH and afterwards. Table 12-1 lists the Pre-ROH, during ROH, and Post-ROH actions and responsibilities for a ship to maintain its 3-M program while involved in an overhaul.

Table 12-1.-ROH-Re1ated 3-M Actions

During an ROH, much of your equipment is naturally going to be removed, partially dismantled, or shut down. However, some equipment must be maintained while inoperative through the use of Inactive Equipment Maintenance. Essentially, IEM provides modified maintenance for equipment that is to be inoperative for extended periods of time. Figure 12-2 shows how a quarterly schedule is modified to include IEM requirements. Shown are two quarterly cycles with IEM beginning in the 23d quarter and ending 4 months later during the 24th quarter. Basically the schedule remains the same, but the changes (as denoted by the circled numbers with arrows) are explained as follows:

1. When making out the new schedule that includes a portion of the ROH, draw red-colored vertical lines on the schedules designating the start and end of the overhaul. Indicate the IEM status of the equipment by entering a II or III. IEM status categories are identified in chapter 6 of OPNAVINST 4790.4.

2. Considerations, such as whether the ship is in dry dock under own-ship's power or air conditioning is available, should be noted as aids in scheduling maintenance requirements in the event that specific services or conditions are necessary to complete the check.

3. Operational PMS should be scheduled as normal up to the beginning of the ROH period.

4. Indicate "YD" with an arrow-tipped line on the MIP line for the equipment that yard personnel or contractors are responsible for.

5. Schedule operational PMS for equipment that will remain operational during the ROH.

6. From the IEM section of the MIP, schedule in green all lay-up and periodic maintenance requirements. Note the scheduling of periodic maintenance of a different periodicity than that specified on the MRC. In this case, for example, the W-2 will only be accomplished monthly as designated by (M) written on the schedule beside the W-2 requirement.

7. Schedule start-up maintenance, and if necessary, operational tests toward the end of the ROH period.

When making the transition into the operational portion of the schedule, do not reschedule requirements that have been accomplished by IEM actions.

Weekly PMS schedules are modified in the same manner as quarterly schedules by drawing a line through

the preprinted operational requirements and substituting the IEM requirements.

Guidelines for the proper use and documentation of Inactive Equipment Maintenance are located in chapter 6 of OPNAVINST 4790.4.