JOINT FLEET MAINTENANCE MANUAL

COMFLTFORCOMINST 4790.3 REV A CH-5
NOTES
1. Each person involved in Sea Trials should be allowed a minimum of six hours of continuous, uninterrupted
sleep during any 24 hour period encompassed by the Sea Trial.
2. Event is optional with regard to sequence. May be conducted at any time during Sea Trials and is not a
prerequisite to the deep dive. If listed with initial tightness dive events, completion is not mandatory prior to
proceeding with remainder of trials.
3. Those seawater systems which are not required for normal safe operation of the ship at test depth but which
have been designed for and may be subjected to test depth pressure should not be subjected to submergence
pressure during the initial dive to any specified depth (e.g., a blown sanitary tank). (See reference (i)).
4. At maximum safe speed, operate the rudder and planes through full throw in both directions in normal and
emergency power. Time evolutions and check against design values.
5. Deep dive should be conducted using moderate speed, or as approved by NAVSEA, and constantly adjusting
trim, at depths specified in reference (i), to maintain neutral buoyancy. Moderate speed shall be defined as
that range of speed that allows the ship to recover from a loss of stern plane control or flooding casualty.
6. Reference (i) prescribes procedures for systems operation during deep dive.
7. In the execution of any Sea Trial, whether escorted or not, submarine COs are reminded of their responsibility
to communicate with escorts and/or shore authorities within prescribed, previously agreed upon time limits to
avoid initiation of inadvertent lost contact or submarine disaster procedures.
8. Integrity of launchers or signal ejectors shall be established by admitting sea pressure through equalizing lines
or flooding connection and the muzzle valve/door operated before conducting operational tests. Shoot water
slugs from specified launchers or signal ejectors, at specified depths, as required by the CS/CCS test program.
Shoot pyrotechnics on initial dive and at test depth on the deep dive. Shooting of pyrotechnics during the
initial dive shall be accomplished in conjunction with the 200 foot EMBT Blow. Shooting of pyrotechnics at
test depth during the deep dive shall be accomplished in conjunction with the test depth EMBT blow.
9. Cycling of rudder and planes through full throw should be limited to 90% of test depth.
10. Test to demonstrate the ability of the tank to withstand external pressure.
11. The required sequence of events is initial dive, deep dive, full power run submerged, then high speed
maneuverability and steep angle tests. On initial propulsion plant trials for new construction nuclear powered
submarines, the deep dive will be to test depth minus 300 feet unless otherwise approved by NAVSEA or the
TYCOM and reflected in the Sea Trial Agenda.
12. Run full power submerged for at least two hours. COs may schedule the full power run for four hours if
deemed necessary. Operate at minimum non-cavitating depth but not to exceed 400 feet. Water depth is not
limited for this event.
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