DEPARTMENT OF THE NAVY
OFFICE OF THE CHIEF OF NAVAL OPERATIONS
2000 NAVY PENTAGON
WASHINGTON, DC 20350-2000
OPNAVINST 3120.33D
N9
8 Nov 2022
OPNAV INSTRUCTION 3120.33D
From: Chief of Naval Operations
Subj: SUBMARINE ENGINEERED OPERATING CYCLE PROGRAM
Ref: (a) COMFLTFORCOMINST 4790.3 Joint Fleet Maintenance Manual
Encl: (1) Submarine Class Operating Intervals, Operating Cycles, Service Life and
Maintenance Strategies
(2)
Maintenance Program Elements
(3)
Glossary of Abbreviations, Acronyms and Terms
(4)
Type Commander Feasibility Study Request for a Potential Operating Interval or
Operating Cycle Extension or both (Sample Letter)
(5)
Program Executive Officer Response to Type Commander Feasibility Study Request
for Potential Operating Interval or Operating Cycle Extension or both (Sample Letter)
(6)
Non-Nuclear Audit Plan for Extending a Submarine Operating Interval, Operating
Cycle and Service Life
(7)
Nuclear Audit Plan for Extending a Submarine Operating Interval, Operating Cycle
and Service Life
(8)
Type Commander Request for an Assessment of the Material and Operational
Condition of USS (insert ship’s name) (SSN or SSBN or SSGN XXX) and
Concurrence with Operating Interval or Operating Cycle Extension or both (Sample
Letter)
(9)
Commanding Officer Assessment of the Material and Operational Condition of USS
(insert ship’s name) (SSN or SSBN or SSGN XXX) and Concurrence with Operating
Interval or Operating Cycle Extension Request or both (Sample Letter)
(10)
Program Executive Officer Approval of Operating Interval or Operating Cycle
Extension Request or both (Sample Letter)
(11)
Type Commander Request for Service Life Extension (Sample Letter)
1. Purpose.
a. Describe program elements, requirements and responsibilities for support of engineered
operating cycle (OPCYCLE) programs for submarines.
b. Define operating interval (OPINTERVAL), OPCYCLE and service life, which are
supported by the class maintenance plan (CMP) for each class of submarine.
