Periodicity Codes
Periodicity Codes
D - Daily Q - Quarterly 2D - Every 2nd day 4M - Every 4th month 3D - Every 3rd day S - Semiannually W - Weekly 8M - Every 8th month 2W - Every 2nd week A - Annually 3W - Every 3rd week xM - Every x months M - Monthly "x"= number of months 2M - Every 2nd month
NOTE
An asterisk (*) following the periodicity code indicates a Safety of Ship item and requires the ship/or user to comply with reference (a).
Maintenance requirements with calendar periodicities greater than every 60 months may be developed for applicable ship classes in extended operability programs up to the length of the maintenance cycle. These periodicities must be evenly divisible by six months (i.e., 66M, 72M, 78M, 84M, etc.).
Non-Calendar Periodicity
R- Situation Requirement
U - Unscheduled Maintenance
Inactive Equipment Maintenance (IEM)
LU - Lay-Up
PM - Periodic Maintenance
SU - Start-Up
OT - Operational Test
The periodicity code also includes a number for specific identification. When more than one MRC of the same periodicity exists in the same MRC set, the MRCs in most cases, will be numbered consecutively, e.g., "D-1," "D-2," "D-3," or "M-1," "M-2," etc. An existing MRC may be reapplied to a revised MIP even though the periodicity code of the reapplied MRC may not fall within the normally sequential numeric periodicity codes. For example, W-1, W-2, W-3, W-6 may appear on a MIP, where W-6 was an existing MRC that was reapplied to this equipment. Technically, valid MRCs will not be reprinted merely to change the periodicity code number. Non-sequential numbers will not affect scheduling or management control.
PERIODICITY TIME FRAMES
(1) Monthly--Will be scheduled within the interval between 3 and 6 weeks following the last accomplishment. A monthly PMS maintenance requirement must be scheduled three times in a quarter. Note: If a monthly maintenance check is circled and rescheduled,
D - Daily Q - Quarterly 2D - Every 2nd day 4M - Every 4th month 3D - Every 3rd day S - Semiannually W - Weekly 8M - Every 8th month 2W - Every 2nd week A - Annually 3W - Every 3rd week xM - Every x months M - Monthly "x"= number of months 2M - Every 2nd month
NOTE
An asterisk (*) following the periodicity code indicates a Safety of Ship item and requires the ship/or user to comply with reference (a).
Maintenance requirements with calendar periodicities greater than every 60 months may be developed for applicable ship classes in extended operability programs up to the length of the maintenance cycle. These periodicities must be evenly divisible by six months (i.e., 66M, 72M, 78M, 84M, etc.).
Non-Calendar Periodicity
R- Situation Requirement
U - Unscheduled Maintenance
Inactive Equipment Maintenance (IEM)
LU - Lay-Up
PM - Periodic Maintenance
SU - Start-Up
OT - Operational Test
The periodicity code also includes a number for specific identification. When more than one MRC of the same periodicity exists in the same MRC set, the MRCs in most cases, will be numbered consecutively, e.g., "D-1," "D-2," "D-3," or "M-1," "M-2," etc. An existing MRC may be reapplied to a revised MIP even though the periodicity code of the reapplied MRC may not fall within the normally sequential numeric periodicity codes. For example, W-1, W-2, W-3, W-6 may appear on a MIP, where W-6 was an existing MRC that was reapplied to this equipment. Technically, valid MRCs will not be reprinted merely to change the periodicity code number. Non-sequential numbers will not affect scheduling or management control.
PERIODICITY TIME FRAMES
(1) Monthly--Will be scheduled within the interval between 3 and 6 weeks following the last accomplishment. A monthly PMS maintenance requirement must be scheduled three times in a quarter. Note: If a monthly maintenance check is circled and rescheduled,