scope:

Scope and Applicability

a. Combat systems operational sequencing system (CSOSS) is required for surface ships with significant combat systems, communications, or other complex electronics-based capabilities, including all surface combatants, aircraft carriers, littoral combat ships, amphibious assault ships, dock landing ships, amphibious transport dock ships, and mine countermeasure ships. Combat systems "A" and "C" schools shall integrate CSOSS into classroom instruction and laboratory exercises.

b. Engineering operational sequencing systems (EOSS) include:

(1) All non-nuclear surface ships and shore propulsion facilities.

(2) Sewage disposal operational sequencing system required on all surface ships.

(3) Cargo fuel operational sequencing system required for automotive gasoline systems on amphibious ships.

(4) Aviation fuel operational sequencing system required for all aircraft carriers and other surface ships with aircraft refueling capability.

(5) Fuel oil operational sequencing system required for cargo fuel delivery systems on cargo fuel delivery ships.

(6) Ballasting operational sequencing system required for ballasting or de-ballasting systems on amphibious ships.

(7) Catapult steam operational sequencing system required for catapult steam systems on aircraft carriers.

(8) Weapons elevator operational procedure required for weapons elevator operation on ships.

(9) Auxiliary system operational sequencing system required for selected auxiliary systems on nuclear powered aircraft carriers.

c. Operational sequencing system is a set of systematic and detailed written procedures, diagrams, and status boards tailored to the individual ship, providing the necessary information for proper equipment or system operation and casualty control. Operational sequencing system standardizes operations; reduces operational costs; accelerates casualty response; significantly reduces uncertainty and improper actions or responses; and provides for safe operation of equipment and systems.

d. Operational sequencing systems supersede all existing operational information and conflicting technical directives for the systems and equipment covered in this directive. Systems and equipment not covered shall be operated per existing procedures and directives.

Purpose

a. To mandate and reaffirm operational sequencing system as the primary shipboard combat system and engineering system readiness tools. Operational sequencing systems provide shipspecific sets of procedures, diagrams, and status boards tailored for ship configuration and watch stations to support initialization and casualty and emergency control of systems and equipment.

b. To mandate use of installed documentation and define responsibility for documentation, review, distribution, training, installation, utilization, monitoring, and updating.

c. This instruction is being reissued with a new date, updated version and signature authority to meet Chief of Naval Operations' (CNO) age requirement for the Office of the Chief of Naval Operations (OPNAV) instructions.